An Einkristallen von LnVO3 (Ln = Gd, Dy und Er), die durch Schmelzflußelektrolyse gezüchtet wurden, erfolgten Röntgenstrukturuntersuchungen. Die drei Verbindungen sind isotyp, sie kristallisieren in einer orthorhombisch verzerrten Perowskitstruktur.
Translated Abstract
X-Ray Structure Analysis of Single Crystals of Ternary Rare Earth Vanadium(III) Oxides LnVO3 (Ln = Gd, Dy, Er)
X-ray structure investigations were performed on single crystals of LnVO3 (Ln = Gd, Dy, and Er), grown by flux electrolysis. The three compounds are isotypic, they crystallize in an orthorhombic distorted perovskite structure.
Einkristalle ternärer Lanthanoid-Vanadium(III)-Oxide LnVO3 (Ln = La, Sm, Gd, Dy, Er, Yb) wurden, ausgehend von den Oxiden V2O5 und Ln2O3, durch kathodischen Reduktion in Schmelzflüssen von Borax und Natriumfluorid erhalten. Die Kristalle wurden mit der Elektronenstrahlmikrosonde und mit Hilfe von Röntgenpulvermethoden charakterisiert.
Translated Abstract
Growth of Single Crystals of Ternary Rare Earth Vanadium(III) Oxides LnVO3 by Flux Electrolysis
A simple method for growing single crystals of rare earth vanadium(III) oxides LnVO3 (Ln = La, Sm, Gd, Dy, Er, Yb) by cathodic reduction, starting from vanadium(V) oxide, in a flux of sodium tetraborate and sodium fluoride at T = 1000 K is described. The products were obtained as black, prismatic crystals, suitable for X-ray investigations etc. They were characterized by electron microprobe analyses and by X-ray powder investigations.
In a cooperative testing of polymer blends of polycarbonate (PC) and linear low-density polyethylene (LLDPE), 17 laboratories from six countries contributed measurements of differential scanning calorimetry (DSC) or differential thermal analysis (DTA) and of thermogravimetric analysis (TGA). This work is part of the activity of the VAMAS* Technical Working Party-Polymer Blends (TWP-PB), which provided the samples and coordinated the tests. Thermal analysis proved to be a, rapid means of assessing the miscibility of polymers using small samples. The system PC/LLDPE investigated in this test is found immiscible. The results of this cooperative test are a basis to elaborate a standard procedure for the characterization of polymer blends.