A Chemical Route to BiNbO4 Ceramics

Title
A Chemical Route to BiNbO4 Ceramics
Authors
Oleg A. Shlyakhtin오영제
Issue Date
2009-03
Publisher
International journal of applied ceramic technology
Citation
VOL 6, NO 2, 312-323
Abstract
The liquid phase sintering of fine BiNbO4 powders allows to obtain dense ceramics with excellent microwave dielectric properties (ε = 44–46; Qxf=16,500–21,600 GHz) at T ≥ 700℃. The thermal decomposition of freeze-dried precursors results in the crystallization of a metastable β'-BiNbO4 polymorph that transforms into a stable orthorhombic α-modification at T ≥ 700℃. The dependence of sinterability on the powder synthesis temperature shows the maximum at 600℃, corresponding to the formation of crystalline BiNbO4 powders with a grain size 80–100 nm. Sintering temperature reduction to 700℃ 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.
URI
http://pubs.kist.re.kr/handle/201004/36969
ISSN
1546-542X
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KIST Publication > Article
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