A Chemical Route to BiNbO4 Ceramics
- A Chemical Route to BiNbO4 Ceramics
- Oleg A. Shlyakhtin; 오영제
- Issue Date
- International journal of applied ceramic technology
- VOL 6, NO 2, 312-323
- 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.
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