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Structure and Microwave Dielectric Characteristics of Ca[(Ga 1/2 Nb 1/2 ) 1− x Ti x ]O 3 Ceramics
Author(s) -
Zhang Song Lin,
Ma Pian Pian,
Liu Xiao Qiang,
Chen Xiang Ming
Publication year - 2015
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.13724
Subject(s) - dielectric , microwave , solid solution , temperature coefficient , analytical chemistry (journal) , materials science , ceramic , crystal structure , x ray crystallography , phase (matter) , dielectric loss , permittivity , mineralogy , crystallography , chemistry , diffraction , optics , metallurgy , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics , composite material
The microwave dielectric characteristics of Ca[(Ga 1/2 Nb 1/2 ) 1− x Ti x ]O 3 ceramics were investigated together with the structure evolution. The excellent microwave dielectric characteristics were achieved by forming solid solution between Ca(Ga 1/2 Nb 1/2 )O 3 and CaTiO 3 in the present ceramics. The solid solutions in space group Pbnm with antiphase and inphase tilting were determined for all compositions where minor secondary phase was detected for x = 0–0.47, whereas no B ‐site ordering was detected. Owing to the structural modification, the dielectric constant (ε r ) increased with increasing x , and the temperature coefficient of resonant frequency (τ f ) could be tuned from negative to positive, while the decrease of Qf value was acceptable. The best combination of microwave dielectric properties was obtained at x = 0.47: ε r = 51.6, Qf = 34 100 GHz and τ f = −0.3 ppm/°C.