‡Department of Chemistry, Moscow State University, Moscow, Russia.
Low Temperature Sintering of Zn3Nb2O8 Ceramics from Fine Powders
Article first published online: 23 AUG 2006
Journal of the American Ceramic Society
Volume 89, Issue 11, pages 3366–3372, November 2006
How to Cite
Shlyakhtin, O. A. and Oh, Y.-J. (2006), Low Temperature Sintering of Zn3Nb2O8 Ceramics from Fine Powders. Journal of the American Ceramic Society, 89: 3366–3372. doi: 10.1111/j.1551-2916.2006.01246.x
B. Ghate—contributing editor
The work is supported by the Brain Pool/KISTEP Fellowship, Ministry of Science and Technology, Korea.
- Issue published online: 12 SEP 2006
- Article first published online: 23 AUG 2006
- Manuscript No. 20932. Received August 29, 2005; approved January 3, 2006.
A possibility to produce microwave (MW) dielectric materials by liquid-phase sintering of fine particles was investigated. Zn3Nb2O8 powders with a grain size 50–300 nm were obtained by the thermal decomposition of freeze-dried Zn–Nb hydroxides or frozen oxalate solutions. The crystallization of Zn3Nb2O8 from amorphous decomposition products was often accompanied by the simultaneous formation of ZnNb2O6. Maximum sintering activity was observed for single-phase crystalline Zn3Nb2O8 powders obtained at the lowest temperature. The sintering of as-obtained powders with CuO–V2O5 sintering aids results in producing MW dielectric ceramics with a density 93%–97% of the theoretical, and a Q×f product up to 36 000 GHz at sintering temperature (Ts)≥680°C. The high level of MW dielectric properties of ceramics was ensured by intensive grain growth during the densification and the thermal processing of ceramics.