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Microwave Dielectric Ceramics Li 2 MO 4 −TiO 2 (M = Mo, W) with Low Sintering Temperatures
Author(s) -
Guo Jing,
Zhou Di,
Zou ShenLi,
Wang Hong,
Pang LiXia,
Yao Xi
Publication year - 2014
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.12821
Subject(s) - sintering , materials science , scanning electron microscope , dielectric , ceramic , microstructure , rutile , analytical chemistry (journal) , phase (matter) , temperature coefficient , microwave , mineralogy , composite material , chemical engineering , chemistry , physics , quantum mechanics , engineering , optoelectronics , organic chemistry , chromatography
In this work, novel series of (1 − x ) Li 2 M O 4 – x TiO 2 (M = Mo, W; x = 0.3, 0.4, 0.45, 0.5, 0.6) ceramics were developed for microwave dielectric application. They were prepared via the mixed‐oxide process and the phase composition, microstructures, sintering behaviors, and microwave dielectric properties were investigated. The X‐ray diffraction (XRD) pattern and scanning electron microscope analysis indicated that the Li 2 M O 4 (M = Mo, W) did not react with rutile Ti O 2 and a stable two‐phase composite system Li 2 M O 4 –Ti O 2 (M = Mo, W) was formed. The XRD pattern of cofired ceramics revealed that some parts of Li 2 Mo O 4 phase and very small part of Li 2 W O 4 phase react with Ag to form Ag 2 Mo O 4 phase and Ag 2 W O 4 phase, respectively. At x = 0.45–0.5, temperature stable microwave dielectric materials with low sintering temperature (700°C–730°C) were obtained: ε r = 10.6–11.0, Qf = 30 060–32 800 GHz, and temperature coefficient of resonant frequency ~0 ppm/°C.