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Low‐Temperature Sintering and Microwave Dielectric Properties of ( Mg 0.95 Zn 0.05 ) 2 ( Ti 0.8 Sn 0.2 ) O 4 –( Ca 0.8 Sr 0.2 ) TiO 3 Composite Ceramics
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.12432
Subject(s) - materials science , sintering , eutectic system , ceramic , analytical chemistry (journal) , microstructure , dielectric , microwave , phase (matter) , mineralogy , nuclear chemistry , composite material , chemistry , chromatography , telecommunications , optoelectronics , organic chemistry , computer science
0.9( Mg 0.95 Zn 0.05 ) 2 ( Ti 0.8 Sn 0.2 ) O 4 –0.1( Ca 0.8 Sr 0.2 ) TiO 3 ( MZTS – CST ) ceramics were prepared by a conventional solid‐state route. The MZTS – CST ceramics sintered at 1325°C exhibited ε r = 18.2, Q × f = 49 120 GHz (at 8.1 GHz), and τ f = 15 ppm/°C. The effects of LiF – Fe 2 O 3 – V 2 O 5 ( LFV ) addition on the sinterability, phase composition, microstructure, and microwave dielectric properties of MZTS – CST were investigated. Eutectic liquid phases 0.12 CaF 2 /0.28 MgF 2 /0.6 LiF and MgV 2 O 6 were developed, which lowered the sintering temperature of MZTS – CST ceramics from 1325°C to 950°C. X ‐ray powder diffraction ( XRPD ) and energy dispersive spectroscopy ( EDS ) analysis revealed that MZTS and CST coexisted in the sintered ceramics. Secondary phase Ca 5 Mg 4 ( VO 4 ) 6 as well as residual liquid phase affected the microwave dielectric properties of MZTS – CST composite ceramics. Typically, the MZTS – CST –5.3 LFV composite ceramics sintered at 950°C showed excellent microwave dielectric properties: ε r = 16.3, Q × f = 30 790 GHz (at 8.3 GHz), and τ f = −10 ppm/°C.