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Low Temperature Sintering of Zn 3 Nb 2 O 8 Ceramics from Fine Powders
Author(s) -
Shlyakhtin Oleg A.,
Oh YoungJei
Publication year - 2006
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/j.1551-2916.2006.01246.x
Subject(s) - sintering , materials science , ceramic , thermal decomposition , dielectric , crystallization , amorphous solid , grain size , grain growth , oxalate , phase (matter) , mineralogy , decomposition , metallurgy , analytical chemistry (journal) , chemical engineering , crystallography , inorganic chemistry , chemistry , optoelectronics , organic chemistry , chromatography , engineering
A possibility to produce microwave (MW) dielectric materials by liquid‐phase sintering of fine particles was investigated. Zn 3 Nb 2 O 8 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 Zn 3 Nb 2 O 8 from amorphous decomposition products was often accompanied by the simultaneous formation of ZnNb 2 O 6 . Maximum sintering activity was observed for single‐phase crystalline Zn 3 Nb 2 O 8 powders obtained at the lowest temperature. The sintering of as‐obtained powders with CuO–V 2 O 5 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 ( T s )≥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.