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Research Article | Open Access

Effect of Sb-site nonstoichiometry on the structure and microwave dielectric properties of Li3Mg2Sb1-xO6 ceramics

Cuijin PEIaJingjing TANaYang LIaGuoguang YAOa,b( )Yanmin JIAaZhaoyu RENbPeng LIUcHuaiwu ZHANGd
School of Science, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
School of Physics, Northwest University, Xi’an 710069, China
College of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, China
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
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Abstract

The non-stoichiometric Li3Mg2Sb1-xO6 (0.05 ≤ x ≤ 0.125) compounds have been prepared via the mixed oxide method. The influences of Sb nonstoichiometry on the sintering behavior, microstructure, phase composition along with microwave dielectric performances for Li3Mg2Sb1-xO6 ceramics were studied. Combined with X-ray diffraction (XRD) and Raman spectra, it was confirmed that phase composition could not be affected by the Sb nonstoichiometry and almost pure phase Li3Mg2SbO6 was formed in all compositions. Appropriate Sb-deficiency in Li3Mg2SbO6 not only lowered its sintering temperature but also remarkably improved its Q×f value. In particular, non-stoichiometric Li3Mg2Sb0.9O6 ceramics sintered at 1250 ℃/5 h owned seldom low dielectric constant εr = 10.8, near-zero resonant frequency temperature coefficient τf = -8.0 ppm/℃, and high quality factor Q×f = 86,300 GHz (at 10.4 GHz). This study provides an alternative approach to ameliorate its dielectric performances for Li3Mg2SbO6-based compounds through defect-engineering.

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Journal of Advanced Ceramics
Pages 588-594
Cite this article:
PEI C, TAN J, LI Y, et al. Effect of Sb-site nonstoichiometry on the structure and microwave dielectric properties of Li3Mg2Sb1-xO6 ceramics. Journal of Advanced Ceramics, 2020, 9(5): 588-594. https://doi.org/10.1007/s40145-020-0397-2

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Received: 14 January 2020
Revised: 31 May 2020
Accepted: 13 June 2020
Published: 11 September 2020
© The author(s) 2020

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