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Affiliation of Author(s):材料科学与技术学院

Journal:J Mater Sci Mater Electron

Abstract:Ba1−xCax(Mg1/3Nb2/3)O3 (0 ≤ x ≤ 0.02) perovskite ceramics were prepared by the solid-state reaction method. The phase composition and microstructure were characterized by XRD and SEM, respectively. The result showed that all ceramics exhibited the 1:2 ordered perovskite structure, and the grain size decreased first and then increased with different substitution amount of Ca2+ for Ba2+. The dielectric properties were examined by Vector network analyzer, and the Raman spectra was used to interpret the dielectric properties of Ba1−xCax(Mg1/3Nb2/3)O3 ceramics. The dielectric constant (Εr) were strongly depended on the Raman shift of A1g(O) stretch mode, and the quality factor (Q × f) manifested great correlated with the full width at half maxima (FWHM) of A1g(O) stretch mode. The Ba1−xCax(Mg1/3Nb2/3)O3 ceramics substituted of Ca2+ for Ba2+ in x = 0.005, which possessed the narrowest FWHM and the highest degree of 1:2 ordering, showed the best microwave dielectric properties: Εr = 31.64, Q × f = 74421 GHz, τf = 14.59 ppm/°C. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.

ISSN No.:0957-4522

Translation or Not:no

Date of Publication:2019-03-01

Co-author:王贺,frl,刘贺,方军,李国郡

Correspondence Author:wang heng chang,frl