TY - JOUR A1 - Töpfer, J. A1 - Hesse, J. A1 - Bierlich, S. A1 - Barth, S. A1 - Capraro, B. A1 - Rabe, Torsten A1 - Naghib Zadeh, Hamid A1 - Bartsch, H. T1 - Integration of Ni-Cu-Zn and hexagonal ferrites into LTCC modules: Cofiring strategies and magnetic properties N2 - We have studied the integration of Ni-Cu-Zn ferrite spinels as well as substituted hexagonal Co2Y-and M-type ferrites into LTCC (Low Temperature Ceramic Co-firing) modules. The cofiring behavior and the magnetic properties of these materials were investigated and evaluated for multilayer applications. Ni-Cu-Zn ferrites exhibit permeabilities of µ=300–500 for operating frequencies in the MHz range. Cu-substituted Y-type ferrites Ba2Co2-x-yZnxCuyFe12O22 in combination with sintering additives display sufficient shrinkage and densification at 900°C. A permeability of µ=10 is observed; however, substituted Co2Y-type ferrites do not exhibit long-term stability at 900°C. Co/Ti-substituted M-type ferrites BaFe12-2yCoyTiyO19 (y=1.2) with planar magneto-crystalline anisotropy exhibit excellent soft magnetic behavior. Using sintering additives, complete densification is reached at 900°C and a permeability of µ=15 and a resonance frequency of larger than 1?GHz are observed. Integration of ferrite multilayer inductor components into LTCC modules using free and constrained cofiring technologies is demonstrated. KW - Ferrites KW - Cofiring KW - LTCC modules KW - Permeability PY - 2014 UR - https://www.jstage.jst.go.jp/article/jjspm/61/S1/61_S214/_pdf DO - https://doi.org/10.2497/jjspm.61.S214 SN - 0532-8799 SN - 1880-9014 VL - 61 SP - Suppl. S1, S214 EP - S217 PB - Ky¯okai CY - Ky¯oto AN - OPUS4-31045 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Naghib Zadeh, Hamid T1 - Herstelung von Hochleistungstransformatoren durch Co-Sinterung magnetischer und dielektrischer LTCC-Folien T2 - Jahrestagung der Deutschen Keramischen Gesellschaft 2014 CY - Clausthal-Zellerfeld, Germany DA - 2014-03-24 PY - 2014 AN - OPUS4-30474 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Naghib Zadeh, Hamid T1 - Low Fired High-K Dielectrics Buried into LTCC Substrates T2 - 5th The Ceramic Interconnect and Ceramic Microsystems Technologies Conf. CY - Denver, CO, USA DA - 2009-04-21 PY - 2009 AN - OPUS4-19688 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Naghib Zadeh, Hamid T1 - BaTiO3-Based High-k Dielectric Compositions with LTCC Compatible Sintering Temperature T2 - 4th The Ceramic Interconnect and Ceramic Microsystems Technologies Conf. CY - Munich, Germany DA - 2008-04-21 PY - 2008 AN - OPUS4-19697 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Naghib Zadeh, Hamid A1 - Glitzky, Carsten A1 - Österle, Werner A1 - Rabe, Torsten T1 - Low temperature sintering of barium titanate based ceramics with high dielectric constant for LTCC applications N2 - The sintering temperature of BaTiO3 powder was reduced to 900 °C due to the ZnO-B2O3-Li2O-Nb2O5-Co2O3 addition. Excellent densification was achieved after sintering at 900 °C for 2 h. The low sintering temperature of newly developed capacitor materials allows a co-firing with pure silver electrodes. The dielectric constant and the temperature stability of the dielectric constant are strongly correlated with the composition of the ZnO-B2O3-Li2O additives. A high dielectric constant up to 3000 and a dielectric loss less than 0.024 were measured on multilayer capacitors sintered at 900 °C with silver inner electrodes. KW - BaTiO3 and titanates KW - Capacitors KW - Dielectric properties KW - LTCC PY - 2011 DO - https://doi.org/10.1016/j.jeurceramsoc.2010.10.003 SN - 0955-2219 SN - 1873-619X VL - 31 IS - 4 SP - 589 EP - 596 PB - Elsevier Ltd. CY - Oxford AN - OPUS4-22886 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Naghib Zadeh, Hamid A1 - Glitzky, Carsten A1 - Rabe, Torsten A1 - Lissner, A. ED - J.G. Herinrich, ED - C. Aneziris, T1 - Development of capacitor materials with sintering temperature below 900 °C T2 - 10th International Conference and Exhibition of the European Ceramic Society (ECerS) CY - Berlin, Germany DA - 2007-06-17 KW - Capacitor KW - LTCC KW - Barium titanate PY - 2007 SN - 3-87264-022-4 SP - 554 EP - 558 PB - Göller CY - Baden-Baden AN - OPUS4-18925 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Naghib Zadeh, Hamid A1 - Glitzky, Carsten A1 - Dörfel, Ilona A1 - Rabe, Torsten T1 - Low temperature sintering of barium titanate ceramics assisted by addition of lithium fluoride-containing sintering additives N2 - By addition of LiF-containing sintering additives to commercial BaTiO3 powder, more than 98% of the theoretical density was reached at a sintering temperature of 900 °C both on powder compacts and laminates. Dielectric measurements were performed on ceramic samples in the temperature and frequency ranges from -20 °C to 125 °C and from 103 to 106 Hz, respectively. High relative permittivity (εr ~ 3160) and low dielectric loss (tan δ ~ 0.014) were measured for tapes of the favoured material. The breakdown strength for tapes with a thickness of about 80 µm is 30 kV/mm. The microprobe analysis showed, that no interfacial reaction between the dielectric layer and the Ag-electrode had occurred. The newly developed barium titanate ceramics completely densifying at 900 °C turned out to be promising for integration of buried capacitors in LTCC multilayers. KW - LTCC KW - BaTiO3 KW - LiF KW - Capacitors PY - 2010 DO - https://doi.org/10.1016/j.jeurceramsoc.2009.07.005 SN - 0955-2219 SN - 1873-619X VL - 30 IS - 1 SP - 81 EP - 86 PB - Elsevier CY - Oxford AN - OPUS4-20133 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Naghib Zadeh, Hamid T1 - Co-Firing of Barium Titanate Based Capacitors with LTCC-Dielectrics, Ag-electrodes and Ferrites at 900°C T2 - Junior Euromat CY - Lausanne, Switzerland DA - 2008-07-14 PY - 2008 AN - OPUS4-20208 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Naghib Zadeh, Hamid T1 - Hoch dielektrische Bariumtitanat-Werkstoffe mit LTCC kompatibler Sintertemperatur T2 - DKG-Jahrestagung u. Symposium Hochleistungskeramik CY - Hermsdorf (Thuringia), Germany DA - 2010-03-22 PY - 2010 AN - OPUS4-21141 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Naghib Zadeh, Hamid T1 - Multikomponente-LTCC bestehend aus niedrig-sinternden X8R Kondensatorfolien, niedrig-sinternden Ferritfolien und Standard-LTCC-Basisfolien T2 - Deutsche IMAPS-Konferenz CY - Munich, Germany DA - 2010-10-12 PY - 2010 AN - OPUS4-22518 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Naghib Zadeh, Hamid A1 - Glitzky, Carsten A1 - Rabe, Torsten T1 - Low fired high-K dielectrics buried into LTCC substrates N2 - Due to addition of minor amounts of suitable additive combinations to BaTiO3 powder the sintering temperature was reduced to 900 °C. Excellent densification (more than 98% of theoretical density) and good dielectric properties were achieved after sintering at 900 °C for 2 hours. Dielectric properties can be improved by modifying the composition of sintering additives and additon of further dopants. The low sintering temperature of newly developed capacitor material allows a co-sintering with pure silver electrodes. No interfacial reaction between silver electrodes and ceramics was observed by microprobe analysis. The dielectric constants of about 1200 to 3000 and the dielectric losses of about 0.008 to 0.02 were measured (f = 1 kHz, T = 25 °C). The temperature dependency of dielectric constant for new capacitor materials is low, almost X7R characteristics. Furthermore, the densification and the dielectric properties of embedded capacitors in LTCC were investigated. T2 - 5th Ceramic Interconnect and Ceramic Microsystems Technologies Conference CY - Denver, USA DA - 2009-04-20 KW - Capacitor KW - LTCC KW - Barium titanate PY - 2009 SN - 0-930815-87-4 IS - WA 32 SP - 000188 EP - 000192 AN - OPUS4-19377 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -