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Novel Series of Low‐Firing Microwave Dielectric Ceramics: Ca 5 A 4 ( VO 4 ) 6 ( A 2+ = Mg , Zn )
Author(s) -
Yao Guoguang,
Liu Peng,
Zhang Huaiwu
Publication year - 2013
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.12359
Subject(s) - ceramic , dielectric , microwave , analytical chemistry (journal) , materials science , mineralogy , phase (matter) , x ray crystallography , diffraction , chemistry , metallurgy , optics , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics
Using a conventional solid‐state reaction Ca 5 A 4 ( VO 4 ) 6 (A 2+ = Mg , Zn ) ceramics were prepared and their microwave dielectric properties were investigated for the first time. X ‐ray diffraction revealed the formation of pure‐phase ceramics with a cubic garnet structure for both samples. Two promising ceramics Ca 5 Zn 4 ( VO 4 ) 6 and Ca 5 Mg 4 ( VO 4 ) 6 sintered at 725°C and 800°C were found to possess good microwave dielectric properties: ε r = 11.7 and 9.2, Q × f = 49 400 GHz (at 9.7 GHz) and 53 300 GHz (at 10.6 GHz), and τ f = −83 and −50 ppm/°C, respectively.