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Sintering behavior, phase structure and adjustable microwave dielectric properties of Li2O–MgO–nTiO2 ceramics (1 ≤ n ≤ 5)

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Abstract

Li2O–MgO–nTiO2 (1 ≤ n ≤ 5) ceramics were prepared by a solid state reaction method. The sintering behavior, phase evolution, microstructure and microwave dielectric properties of ceramics were investigated. With increasing n value, the microstructure of ceramics changed from a porous structure to the compact structure. Bulk density, relative permittivity (ε r ) and temperature coefficient of resonator frequency (τ f ) firstly increased, reached a max value and then decreased with increasing n values. Q × f value first decreased, then increased and finally decreased again. When n = 2, Li2O–MgO–2TiO2 systems presented good microwave dielectric properties with Q × f value of 44,914 GHz, ε r of 20.8 and τ f of −10.15 ppm/oC and low density of 3.33 g/cm3. When n = 3, Li2O–MgO–3TiO2 systems showed better comprehensive performances with sintering temperature of 1050 °C, Q × f value of 48,513 GHz, ε r of 25.5, τ f of 1.6 ppm/oC and low density of 3.40 g/cm3.

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Acknowledgements

This work was supported by Natural Science Foundation of China (Nos. 11464009 and 11364012), Natural Science Foundation of Guangxi (Nos. 2015GXNSFDA139033, 2014GXNSFAA118312, 2013GXNSFAA019291 and 2014GXNSFAA118326), Research Start-up Funds Doctor of Guilin University of Technology (Nos. 002401003281 and 002401003282) and Project of Outstanding Young Teachers׳ Training in Higher Education Institutions of Guangxi.

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  1. Guangxi Ministry-Province Jointly-Constructed Cultivation Base for State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi Key Laboratory in Universities of Clean Metallurgy and Comprehensive Utilization for Non-ferrous Metals Resources, Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China

    Huanfu Zhou, Xianghu Tan, Jin Huang, Kangguo Wang, Wendong Sun & Xiuli Chen

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  1. Huanfu Zhou
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Correspondence to Huanfu Zhou.

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Zhou, H., Tan, X., Huang, J. et al. Sintering behavior, phase structure and adjustable microwave dielectric properties of Li2O–MgO–nTiO2 ceramics (1 ≤ n ≤ 5). J Mater Sci: Mater Electron 28, 6475–6480 (2017). https://doi.org/10.1007/s10854-017-6334-7

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