TY - CONF A1 - Huang, S. G. T1 - Effect of carbon content on the microstructure and mechanical properties of NbC-Ni based cermets N2 - The aim of this work was to correlate the carbon content in NbC-Ni starting powders with the resulting microstructure, hardness and fracture toughness of Ni-bonded NbC cermets. T2 - 19. Plansee Seminar CY - Reutte, Austria DA - 29.05.2017 KW - Cermet KW - Liquid phase sintering KW - Microstructure KW - Hardness KW - Carbon PY - 2017 AN - OPUS4-40647 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Genga, R. M. T1 - Microstructure and wear behavior of improved NbC cermets for (BS-1452) grey cast iron machining N2 - Tungsten carbide (WC) and cobalt (Co) based cermets are the most successful commercial cermets beacuse of the good combination of physical, mechanical and behavioral properties. Niobium carbide (NbC) has good mechanical and physical properties, such as high hardness, very high melting point and low density. SPS refined the NbC grains and increased the hardness, while substitution of Co with Ni improved the fracture toughness. T2 - 19. Plansee Seminar CY - Reutte, Austria DA - 29.05.2017 KW - Cermets KW - Grey cast iron machining KW - Tungsten carbide (WC) KW - Niobium carbide (NbC) KW - Wear PY - 2017 AN - OPUS4-40603 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gottlieb, Cassian T1 - Material properties and their impact on laserinduced plasmas for concrete analysis N2 - For concrete production aggregates, cement and water are mixed together and after 28 days of hydration a porous and multiphase material is formed. To consider the heterogeneity of concrete a 2D scanning system is used. The coarse aggregates (limit > 2 X d ) can be excluded. laser spot The remaining content is a mixture of flour grains and cement particles (micro heterogeneity). Harmful species like chlorides may penetrate together with water through the capillary pore space. A quantification of Cl regarding to the cement content only (European standard EN 206) is necessary for the damage assessment. A LIBS system operating with a NdCr:YAG laser (pulse energy of 3 mJ, a wavelength of 1064 nm, a pulse width of 1.5 ns, a repetition rate of 100 Hz) and two Czerny-Turner spectrometer (UV and NIR range) have been used. T2 - EMSLIBS Konferenz 2017 CY - Pisa, Italy DA - 12.06.2017 KW - Concrete KW - LIBS KW - Micro-heterogeneity PY - 2017 AN - OPUS4-40938 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neumann, Martin T1 - Development of a material model for the crush of spruce wood N2 - Typical transport packages used in Germany are equipped with wooden impact limiting devices. In this paper we give an overview of the latest status regarding the development of a finite element material model for the crush of spruce wood. Although the crush of wood – mainly in longitudinal direction – is a phenomenon governed by macroscopic fracture and failure of wood fibres we smear fracture and failure mechanisms over the continuous voume. In first step we altered an existing LS-DYNA material model for foams, which considers an ellipse shaped yield surface written in terms of the first two stress invariants. The evolution of the yield surface in the existing model depends on the volumetric strain only. For the use with spruce wood, we modified the existing material model to consider the deviatoric strain for the evolution of the yield surface as well. This is in accordance with the results of crush tests with spruce wood specimens, where the crushing deformation was rather deviatoric for uniaxial stress states and rather volumetric for multiaxial stress states We rate the basic idea of this approach to be reasonable, though other problems exist regarding the shape of the yield surface and the assumption of isotropic material properties. Therefore we developed a new transversal isotropic material model with two main directions, which considers different yield curves according to the multiaxiality of the stress state via a multi-surface yield criterion and a non-associated flow rule. The results show the ability to reproduce the basic strength characteristics of spruce wood. Nevertheless, problems with regularization etc. show that additional investigations are necessary. T2 - ASME PVP 2017 CY - Waikaloa, HY, USA DA - 16.07.2017 KW - Crush KW - Wood KW - Spruce KW - FEM PY - 2017 AN - OPUS4-41617 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Babutzka, Martin A1 - Reinemann, Steffi T1 - Influence of corundum grinding processes on the corrosion behaviour of austenitic stainless steels N2 - The scientific poster shows by means of corrosion testing in combination with surface analytical methods to which degree corundum grinding influences the corrosion behaviour of stainless steel surfaces. The austenitic stainless steel AISI 304 from a consistent heat was used for all investigations to guarantee the same chemical composition and thus no additional influences caused by the material itself. A wide range of different grinding parameters such as pressure, cooling medium and grain size of the abrasive was varied. Thus, comparison of the corrosion behaviour of different surface states and the evaluation of an optimum grinding process using corundum abrasives were possible. The results will contribute to present discussions and give novel impulses for companies in the metalworking industry. T2 - Eurocorr 2017 CY - Prague, Czech Republic DA - 03.09.2017 KW - Korrosion KW - Corrosion KW - Korundschleifen KW - Corundum grinding KW - Nichtrostende Stähle KW - Stainless steels PY - 2017 AN - OPUS4-41896 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Sahre, Mario T1 - Electroplated magnetostrictive actuator layer enabling the external diagnosis of strain sensors N2 - Embedded fibre-opticaloptical strain sensors are suitable for structural health monitoring. In order to validate long-term performance (e.g.sensors integrated in airplane wings or wind power turbine blades) an external diagnostics is required. A strain-detecting region of the optical fibre, the fibre Bragg grating (FBG, is encased by a magnetostrictive layer system serving as actuator. For the validation of the correct sensor function, an external magnetic field introduces mechanical strain resulting in a defined shift of the Bragg wavelength. The layer system is realized by acombined PVD /ECD process optimized regarding magnetostrictive and mechanical properties. The long -term stability of layer adhesion and actuator function has been verified. T2 - 12. Thementage Grenz- und Oberflächentechnik (ThGOT) und das 5. Kolloquium Dünne Schichten in der Optik CY - Zeulenroda, Germany DA - 14.03.2017 KW - Magnetostrictive actuator layer KW - PVD /ECD process KW - Magnetostrictive layer KW - Strain sensors PY - 2017 AN - OPUS4-41800 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Lange, Thorid T1 - Mehr-Proben-Kleb-Vorrichtung (MPKV) zur Validierung der Klebfestigkeit N2 - Mit der Verfügbarkeit der Mehr-Proben-Prüfung von bis zu 8 Klebverbunden mittels CAT-Technologie (CAT: centrifugal adhesion testing) wurde im Forschungsvorhaben OKTETT ein durchgehendes Mehr-Proben-Konzept zur Validierung der Klebfestigkeit angewendet. Dazu gehört ein universeller Probenteller (Abb.1) zur Mehr-Proben-Handhabung bei Vorbehandlung, Lagerung, Transport und Klebung. Für das Mehr-Proben-Kleben wurde die MSB-Technologie (MSB: multiple sample bonding) unter Verwendung einer instrumentierten hydraulischen Mehr-Proben-Kleb-vorrichtung entwickelt. Damit kann der Klebandruck für bis zu 8 Prüfkörper über einen Drucksensor definiert eingestellt und die gesamte Vorrichtung beim Kleben Temperaturen von bis zu 180°C ausgesetzt werden. T2 - 12. Thementage Grenz- und Oberflächentechnik (ThGOT) und das 5. Kolloquium Dünne Schichten in der Optik CY - Zeulenroda, Gemany DA - 14.03.2017 KW - Zentrifugentechnologie KW - Mehr-Proben-Kleben (MSB) KW - Mehr-Proben-Prüfen (CAT) KW - Haftfestigkeit KW - Verbundfestigkeit PY - 2017 AN - OPUS4-41291 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Sentker, K. A1 - Yildirim, Arda T1 - Characterization of the thermotropic phase behavior and microscopic structure of a confined discotic liquid crystal N2 - Discotic liquid crystals (DLC) filled into cylindrical nanopores exhibit a liquid crystalline phase with their molecules arranged in hexagonal columns. The columns orient perpendicular (radially) or parallel (axially) with respect to the pore axis depending on surface anchoring conditions and pore size. Axially oriented columns enable the fabrication of organic nanowires utilizing the high conductivity in the stacking direction due to overlapping π-electrons. This leads to interesting applications in e.g. organic semiconductorbased devices. The molecular ordering of the liquid crystalline columns can be probed by temperature dependent optical retardation measurements supplemented by X-ray diffraction sensitive to the translational order. We investigated the DLC 2, 3, 6, 7, 10, 11 - hexakis [hexyloxy] triphenylene (HAT6) embedded in nanoporous alumina and silica membranes as function of the pore diameter (12 nm - 180 nm). Due to their hydrophilic nature porous membranes enforce face-on anchoring leading to a radial orientation. To obtain edge-on anchoring conditions, and thus favoring axial orientation, the silica membrane surface is chemically modified. The optical retardation measurements show that the columns orient radially in these membranes independent of the anchoring conditions. Interestingly, a quantized phase transition of each molecular layer is found indicated by a distinct increase of the optical orientation. Additionally, an axial orientation of HAT6 filled into alumina membranes with a pore diameter of 25 nm is achieved. A Landau-de Gennes ansatz semi-quantitatively describes the phase transition behavior observed. X-ray diffraction experiments performed at the 3rd generation synchrotron radiation source PETRA III at DESY giving detailed information about the translational order support these findings. Summarizing, this study shows the existence of a phase transition in the molecular range as well as the suitability of the membrane with 25 nm pores as a template for preparing organic nanowires. T2 - Liquids 2017 – 10th Liquid Matter Conference CY - Ljubljana, Slovenia DA - 17.07.2017 KW - Discotic Liquid Crystals PY - 2017 AN - OPUS4-41180 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bertin, Annabelle T1 - Upper critical solution temperature (UCST)- type thermoresponsive polymers from acrylamide-based monomers N2 - UCST-type thermoresponsive polymers that phase separate from solution upon cooling present a tremendous potential not only in aqueous media where they can be used in drug delivery, diagnostic and microfluidic applications, but also in water/alcohol mixtures, where they can be used for instance in sensing systems for alcohol-soluble drugs. However, only a few thermoresponsive polymers have been reported that present an UCST in a relevant temperature range and “green” solvents such as water or ethanol. In this context, acrylamide-based monomers can be very useful building blocks for designing novel UCST-type polymers because of their hydrophilic nature (with the right side chain) and propensity to form hydrogen bonds. We want to present our latest results on the copolymer poly(acrylamide-co-acrylonitrile) (P(AAm-co-AN)) that present a UCST in water as well as on two homopolymers based on an acrylamide derivative of 2,6-diaminopyridine, namely poly(N-(6-aminopyridin-2-yl)acrylamide) (PNAPAAm) and poly(N-(6-acetamidopyridin-2-yl)acrylamide) (PNAcAPAAm) that show UCST-type thermoresponsiveness in water/alcohol mixtures. Our focus for P(AAm-co-AN)) is its aggregation behaviour above and below its phase transition temperature as the size of thermoresponsive polymeric systems is of prime importance for biomedical applications (as size dependent processes take place in the body) and is linked to the optical properties of a material that matter in materials science. In the case of PNAPAAm and PNAcAPAAm, we focused on the co-solvency/co-non solvency effect on the phase transition temperature in water/alcohol mixture. Indeed, polymers with UCST behavior below 60°C in water/alcohol mixtures are extremely promising for the preparation of “smart” materials for sensing. T2 - 31st Conference of the European Colloid and Interface Society (ECIS 2017) CY - Madrid, Spain DA - 03.09.2017 KW - Thermoresponsive polymers KW - UCST polymers KW - Acrylamide based polymers PY - 2017 AN - OPUS4-41902 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Erdmann, Maren T1 - Effect of surface degradation on high-density polyethylene for initial attachment of bacillus and pseudomonas N2 - High-density polyethylene (PE-HD) is a widely applied plastic for fuel storage tank applications. But such tanks, filled with diesel or biodiesel, provide excellent environmental conditions for growth of a broad spectrum of fungi and various bacteria1. This can result in fuel contamination, engine plugging or possible (bio-) degradation2. Our research focusses on the initial attachment phase of Bacillus sp. and Pseudomonas aeruginosa isolated from a „dieselpest“2 on two distinctly PE-HD materials, typical for fuel storage tank applications, pre-damaged thermally and by UV-irradiation. T2 - PDDG CY - Taormina, Sicily, Italy DA - 04.09.2017 KW - PE-HD KW - UV-irradiation KW - Initial attachment KW - Bacteria PY - 2017 AN - OPUS4-41908 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Erdmann, Maren T1 - Long-term storage of high-density polyethylene in biodiesel and diesel fuels N2 - Sustainable energy and clean engine fuels receive more and more attention. Petrodiesel could be substituted by biofuels such as biodiesel produced from renewable resources. Biodiesel is derived by transesterification of oils with alcohols for example vegetable oils, animal fats or food waste. Its chemical composition of unsaturated fatty methyl acids causes biodiesels susceptibility to oxidation. Especially, the polymer-biodiesel performance under long-term conditions has been considered only in few researches. Our study addresses a long-term storage scenario of a polymeric fuel tank containing biodiesel or diesel. T2 - PDDG CY - Taormina, Sicily, Italy DA - 04.09.2017 KW - PE-HD KW - Degradation KW - Biodiesel KW - Diesel PY - 2017 AN - OPUS4-41909 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Schreier, Andy T1 - Analytical model for mode-based insertion loss in ball-lensed coupling of graded-index silica and polymer fibres N2 - Analytical model for ball-lensed couplers to calculate the insertion loss for each optical mode. The basis for the calculation are commercial perfluorinated polymer optical (PFGI-POFs) and silica based fibres (SOFs). The modal power distribution for given misalignments are presented as well as the reflection-based losses at all optical interfaces. Additionally, the ball-lensed interconnection between PFGI-POF and SOF was theoretically demonstrated. T2 - POF 2017: 26th International Conference on Plastic Optical Fibres CY - Aveiro, Portugal DA - 13.09.2017 KW - Polymer optical fibre KW - Optical connector PY - 2017 AN - OPUS4-41974 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Fontana, P. T1 - Healthier life with eco-innovative components for housing constructions N2 - The project has developed a variety of new multifunctional and flexible building components for a healthier indoor environment. [H] house solutions are durable, energy efficient, safe and affordable. They are suitable for use in new buildings and for renovation. [H] house solutions cover aspects of long service life, reduced maintenance and long-term improvement of energy efficiency. T2 - H-House Abschluss-Kolloquium, Dauerausstellung am Demonstrator-Gebäude CY - Warsaw, Poland DA - 23.08.2017 KW - Building materials KW - Beton KW - UHPC PY - 2017 AN - OPUS4-43003 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Waurischk, Tina T1 - New device for inert crack growth measurements in ultra-strong glasses N2 - The practical strength of glasses under ambient conditions is substantially lower compared to its intrinsic strength because of sub-critical crack growth (SCCG) from microscopic flaws. While SCCG is related to the humidity of the ambient atmosphere, leading to stress corrosion phenomena, the detailed kinetics are still not fully understood. To get better insight to the contribution of water on the crack-tip, highly water bearing glasses will be investigated by a new device for inert SCCG-measurements using double cantilever beam (DCB) geometry specimens. This device was designed to investigate the stress intensity factor in modus I and crack velocity in vacuum, but different atmospheres can also be introduced. For validation of the new device, first experiments were performed on microscope slides as well as on a soda-lime silicate and a borosilicate crown glass. The results achieved will be presented in comparison to the published results of Wiederhorn. T2 - 91. Glastechnische Tagung CY - Weimar, Germany DA - 29.05.2017 KW - Double cantilever beam KW - DCB KW - Crack intensity factor KW - Crack growth velocity KW - Glass PY - 2017 AN - OPUS4-40680 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Welter, T. T1 - Glass structures with low helium and hydrogen permeability N2 - An efficient energy provision using fuel cells is linked to effecitve hydrogen storage capabilities. Because of its low intrinsic hydrogen permeability, glass has a huge potential in modern concepts of hydrogen storage. Previous studies on oxidic glasses showed an empirical connection between glass composition and gas permeation, which was mainly derived from the behavior of silica glass. In this study we focus on the relationship between topologic (free volume; network polymerization) and thermodynamic (configurational entropy) parameters. The comparison of three glasses within the meta (earth-) alkaline alumino silicate system to silica glass shows that an increase of the atomic packing factor (APF) does not necessarily decrease the permeability. Furthermore, the results suggest a connection between ΔCp at Tg and hydrogen permeability of the glass. All experiments were performed assuming that chemical hydrogen solubiltity in glass is negligible at temperatures well below the glass transition temperature. T2 - 91. Glastechnische Tagung CY - Weimar, Germany DA - 29.05.2017 KW - Hydrogen permeability KW - Glass composition KW - Atomic packing factor KW - Configurational entropy KW - Diffusion coefficient PY - 2017 AN - OPUS4-40488 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marzok, Ulrich T1 - 3D High-temperature laser profilometry during sintering N2 - Most crucial for components of complex shape or heterogeneous micro structure, precise control of sintering has decisive influence on dimensional accuracy, mechanical integrity and reliability of sintered components. In these cases, only in situ 3D high-temperature shape screening during shrinkage would allow revealing temporary sinter warpage and hereby caused potential defects. Against this background, nokra Optische Prüftechnik und Automation GmbH, HTM Reetz GmbH and BAM developed a testing device for in situ 3D shape screening for ceramic and glass-ceramic tapes up to 1000°C by means of high-temperature laser profilometry. The local repeatability of the sample-sensor distance (sample height profile) is 10 µm at 1000°C. Current work is focused on dropping these restrictions in sample shape and temperature. In a second testing device, currently being in development, samples up to 5 cm x 5 cm x 5 cm can be measured at temperatures up to 1500°C.The presentation illustrates the current state of this work and possible applications of the method. T2 - 92. DKG Jahrestagung CY - Berlin, Germany DA - 19. 03. 2017 KW - Laser profilometry KW - 3D High-temperatue shape screening KW - Sintering PY - 2017 AN - OPUS4-40449 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Marzok, Ulrich T1 - Measurement of H2 permeability of glasses with VHE powder method N2 - The development of glassy hydrogen barriers requires the determination of low H2 permeabilities. Previous studies and numerical simulations have shown that the VHE powder method (vacuum hot extraction with mass spectrometric gas detection) is suitable for this purpose. The measured isothermal gas emission is fitted to a classical diffusion model for spherical particles from which the diffusion coefficient of the glass is calculated. The H2 permeability is determined by means of the solubility determined from the same measurement data. This presentation is referring to the optimization of the method regarding sample preparation and measurement data evaluation using suitable experimentally determined particle size distributions is reported. For quartz glass, it is shown that the accuracy of classical measuring methods is achieved with the VHE powder method. Furthermore, other examples of substantially gas-tighter glasses are given. T2 - 91. Glastechnische Tagung CY - Weimar, Germany DA - 29.05.2017 KW - Hydrogen permeation KW - Glass KW - Vacuum hot extraction KW - Powder method KW - Diffusion coefficient PY - 2017 AN - OPUS4-40441 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Waurischk, Tina T1 - New device for inert sub-critical crack growth: measurements in crystallized glasses N2 - Compared to its intrinsic strength, the practical strength of glasses is substantially lowered by microscopic flaws. Their sub critical growth from the surface is strongly affected by ambient humidity. A new device was designed to enable the observation of sub critical crack growth (SCCG) in vacuum and controlled atmosphere. It allows measurements in transparent and semi-transparent materials in double cantilever beam (DCB) geometry. The aim of the present work is to study the effect of crystals on crack growth. T2 - 12th International Symposium on Crystallization in Glasses and Liquids CY - Segovia, Spain DA - 10.09.2017 KW - Double cantilever beam KW - DCB KW - Crack intensity factor KW - Crack growth velocity KW - Glass KW - Glass ceramic PY - 2017 AN - OPUS4-41995 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Müller, Thoralf A1 - Rosemann, Paul T1 - Influence of the post-weld surface treatment on the corrosion resistance of duplex stainless steel 1.4062 N2 - The duplex stainless steel 1.4062 (X2CrNiN22-2) is used as alternative material to austenitic stainless steels in the construction industry. The corrosion resistance of welded seams is influenced by the base material, the weld filler material, the welding process and also by the final surface treatment. The scale layer next to the weld seam can be removed by grinding, pickling, electro-polishing or blasting depending on the requested corrosion resistance. Blasted surfaces are often used in the industrial practice due to the faster and cheaper manufacturing process compared to pickled or electro-polished surfaces. Furthermore blasting with corundum-grain is more effective than blasting with glass-beads which also lower the process costs. In recent years, stainless steel surfaces showed an unusually high susceptibility to pitting corrosion after grinding with corundum. For this reason, it is now also questioned critically whether the corrosion resistance is influenced by the applied blasting agent. This question was specifically investigated by comparing grinded, pickled, corundum-grain- and glass-bead-blasted welding seams. Results of the SEM analyses of the blasting agents and the blasted surfaces will be presented and correlated with the results of different corrosion tests (KorroPad-testing and pitting potentials). T2 - Eurocorr 2017 CY - Prague, Czech Republic DA - 03.09.2017 KW - Duplexstahl KW - Korrosion KW - Nichtrostender Stahl KW - Oberflächenbearbeitung KW - Schweißen KW - Strahlen PY - 2017 AN - OPUS4-41915 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kotaka, M. T1 - Unique growth behavior of ferroelastic beta’-Gd2(MoO4)3 crystals in glasses N2 - An understanding on crystallization behavior and kinetics in glasses is one of the important topics in the glass science and technology. Tsukada et al.1) found an extremely unique and curious phenomenon in the crystallization of multiferroic (ferroelectric and ferroelastic properties) ’-Gd2(MoO4)3 crystals in Gd2O3-MoO3-B2O3 glasses. That is, crystals formed in the crystallization break into small pieces with a triangle prism or pyramidal shape having a length of 50-150 um spontaneously during the crystallization in the inside of an electric furnace, not during the cooling in air after the crystallization. They proposed to call this phenomenon “self-powdering phenomenon”. To the best of our knowledge, such a self-powdering phenomenon has not been observed in the crystallization of any other glasses. To investigate this phenomenon is very important for the glass science and for the preparation of bulk crystallized glasses with ferroelastic crystals. In this work, the preparation of crystallized glasses keeping the original shape is challenged, and the mechanism of self-powdering phenomenon is proposed. Glasses with the compositions of 21Gd2O3-63MoO3-(16-x)B2O3-xTeO2 (mol%) (x=0, 2, 4, 8) such as 21Gd2O3-63MoO3-16B2O3 (GM16B) and 21Gd2O3-63MoO3-8B2O3-8TeO2 (GM8T8B) were prepared using a conventional melt quenching technique. The quenched glasses were heat-treated at some temperatures, and the crystalline phase present in the crystallized samples was identified by X-ray diffraction (XRD) analyses, and the morphology and birefringence of crystals formed were observed using a polarized optical microscope (POM). The densities of GM16B and GM8T8B glasses are 4.76 g/cm3 and 4.91 g/cam3, respectively, and these values are higher than the density of ’-Gd2(MoO4)3 crystal, 4.555 g/cm3. These differences in the density might induce the large stresses in the inside of crystals during the crystal growth. The crystallized glasses of GM16B with ’-Gd2(MoO4)3 crystals do not keep the original glass shape, showing self-powdering phenomenon (breaking into small pieces). However, the crystallized glasses of GM8T8B keep the original glass shape without indicating any self-powdering. It is proposed that the stress at the interface between the glassy phase and ’-Gd2(MoO4)3 crystalline phase might be reduced in GM8T8B glasses containing TeO2 with weak Te-O bonds. T2 - Crystallization 2017 CY - Segovia, Spain DA - 10.09.2017 KW - Glass KW - Crystallization KW - Self-powdering PY - 2017 AN - OPUS4-44403 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -