Shlyakhtin, Oleg A. Oh, Young-Jei 2024-01-20T22:00:46Z 2024-01-20T22:00:46Z 2021-09-03 2009-03 1546-542X https://pubs.kist.re.kr/handle/201004/132715 The liquid phase sintering of fine BiNbO4 powders allows to obtain dense ceramics with excellent microwave dielectric properties (epsilon=44-46; Q x f=16,500-21,600 GHz) at T >= 700 degrees C. The thermal decomposition of freeze-dried precursors results in the crystallization of a metastable beta'-BiNbO4 polymorph that transforms into a stable orthorhombic alpha-modification at T >= 700 degrees C. The dependence of sinterability on the powder synthesis temperature shows the maximum at 600 degrees C, corresponding to the formation of crystalline BiNbO4 powders with a grain size 80-100 nm. Sintering temperature reduction to 700 degrees C prevents the deterioration of silver contacts during co-firing with BiNbO4 ceramics. In situ scanning electron microscopy observation of the morphological evolution during sintering shows that the intense shrinkage soon after the appearance of a CuO-V2O5 eutectics-based liquid phase is accompanied by complete transformation of the ensemble of primary BiNbO4 particles. English WILEY MICROWAVE DIELECTRIC-PROPERTIES SINTERING BEHAVIOR ELECTRICAL-PROPERTIES CUO-V2O5 MIXTURES SILVER ELECTRODES CRYSTAL-STRUCTURE SINGLE-CRYSTALS LIQUID-PHASE TAU(F) VALUE V2O5 A Chemical Route to BiNbO4 Ceramics Article 10.1111/j.1744-7402.2008.02278.x 1 INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY, v.6, no.2, pp.312 - 323 INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY 6 2 312 323 scie scopus 000264020600024 2-s2.0-62649155249 Materials Science, Ceramics Materials Science Article MICROWAVE DIELECTRIC-PROPERTIES SINTERING BEHAVIOR ELECTRICAL-PROPERTIES CUO-V2O5 MIXTURES SILVER ELECTRODES CRYSTAL-STRUCTURE SINGLE-CRYSTALS LIQUID-PHASE TAU(F) VALUE V2O5