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Sr 4− m La m Ti m −1 Ta 4− m O 12 ( m =1, 2, 3): A Novel Series of A 4 B 3 O 12 ‐Type Microwave Ceramics with a High Q and Low τ f
Author(s) -
Fang Liang,
Li Chunchun,
Peng Xiyang,
Hu Changzheng,
Wu Bolin
Publication year - 2010
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.1551-2916.2010.03657.x
Subject(s) - ceramic , dielectric , analytical chemistry (journal) , temperature coefficient , crystallite , materials science , perovskite (structure) , hexagonal crystal system , mineralogy , crystallography , chemistry , metallurgy , optoelectronics , chromatography , composite material
A novel series of single‐phase polycrystalline ceramics Sr 4− m La m Ti m −1 Ta 4− m O 12 ( m =1, 2, 3) were prepared through the solid‐state ceramic route. All of them adopt A 4 B 3 O 12 ‐type cation‐deficient hexagonal perovskite structure. The microwave dielectric properties can be tuned by controlling the composition or the value of m . As m increases, the dielectric constant (ɛ r ) of the ceramic increases from 30 to 40.1 and the quality factor ( Q × f ) enhances from 16 050 to 42 130 GHz, and the temperature coefficient of resonant frequency (τ f ) improves from −43 to −8 ppm/°C.