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Synthesis, Microstructure, and Microwave Dielectric Properties of Spinel ZnGa 2 O 4 Ceramics
Author(s) -
Xue Juanjuan,
Wu Songping,
Li Jianhui
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.12331
Subject(s) - spinel , microstructure , materials science , sintering , ceramic , temperature coefficient , dielectric , microwave , mineralogy , analytical chemistry (journal) , metallurgy , composite material , optoelectronics , chemistry , telecommunications , chromatography , computer science
Spinel ZnGa 2 O 4 ceramics were synthesized by conventional solid‐state method and their microwave dielectric properties were investigated. The phase evolution and microstructures of specimens were studied by XRD and SEM . The textured surface microstructures of ZnGa 2 O 4 ceramics formed at high sintering temperatures. The spinel‐structured ZnGa 2 O 4 ceramics sintered at 1385°C exhibited excellent microwave dielectric properties: a dielectric constant (ε r ) of 10.4, a quality factor ( Q × f ) of 94.600 GHz, and a temperature coefficient of resonant frequency (τ f ) of −27 ppm/°C. ZnGa 2 O 4 ceramics have a low sintering temperature, a wide temperature region, and a small negative τ f value. They are promising candidate materials for millimeter‐wave devices.
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