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Synthesis and microwave dielectric properties of new high quality Mg 2 NdNbO 6 ceramics
Author(s) -
Zhang Shaobo,
Shi Liwei,
Zhang Lanyang,
Zhu Haiyan,
Xia Wangsuo
Publication year - 2018
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.15313
Subject(s) - materials science , sintering , ceramic , dielectric , monoclinic crystal system , temperature coefficient , microstructure , analytical chemistry (journal) , microwave , phase (matter) , mineralogy , grain size , atmospheric temperature range , metallurgy , composite material , crystal structure , crystallography , chemistry , optoelectronics , thermodynamics , physics , organic chemistry , chromatography , quantum mechanics
New high‐quality microwave dielectric ceramics Mg 2 NdNbO 6 were prepared by conventional solid‐state sintering method. The phases, micro‐structures and microwave dielectric properties of Mg 2 NdNbO 6 ceramics were investigated at sintering temperature in the range of 1275°C‐1400°C. The X‐ray diffraction patterns showed that the peaks of the compounds were attributed to two phases, including the main crystalline phase of NdNbO 4 that was indexed as the monoclinic phase and MgO as the second phase. Well‐developed microstructures of Mg 2 NdNbO 6 ceramics can be achieved, and the grain size reached the maximum value (1.63 μm) at 1375°C. As the sintering temperature increased, the dielectric constant, temperature coefficient of resonant frequency and apparent density remained almost unchanged, however, the significant change in the quality factor was observed. At 1375°C, Mg 2 NdNbO 6 ceramics possessed excellent microwave dielectric properties: ε r = 16.22, Q × f = 116 000 GHz and τ f = −30.96 ppm/°C.