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Low‐Temperature Synthesis of CoNb 2 O 6 Microwave Dielectric Ceramics
Author(s) -
Zhang Yun,
Liu Shuya,
Zhang Yingchun,
Xiang Maoqiao
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14392
Subject(s) - orthorhombic crystal system , materials science , ceramic , calcination , sintering , dielectric , microwave , mineralogy , x ray crystallography , metal , cobalt , analytical chemistry (journal) , diffraction , crystallography , crystal structure , metallurgy , chemistry , catalysis , optics , organic chemistry , physics , optoelectronics , quantum mechanics
Low‐fired cobalt niobate (CoNb 2 O 6 ) microwave dielectric ceramics were prepared through a developed sol–gel process using Nb 2 O 5 · n H 2 O as starting source. A metal‐dioxo‐bridged complex precursor was described on the basis of FT ‐ IR spectrum. The crystalline phases of calcined powders were characterized by X‐ray diffraction. Nanosized CoNb 2 O 6 particles with orthorhombic α‐PbO 2 ‐type structure were obtained above 750°C. There was no subsequent phase change upon sintering, and all compounds sintered to at least 94% of theoretical density. At 1000°C/4 h, CoNb 2 O 6 ceramics exhibited ε r ~ 21.9, Q × f ~ 66 140 GH z (at 8.9 GHz) and τ f ~ −39.7 ppm/°C, having a good potential for low‐temperature cofired ceramic applications.