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Effect of La2O3 addition on the microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 ceramics

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Abstract

In this paper, Ba(Mg1/3Ta2/3)O3 (BMT) ceramics with x (x = 0–5) wt% La2O3 were prepared by the conventional solid-state ceramic route for investigating the effect of La2O3 addition on the microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 ceramics. The XRD results showed that the main crystal phase in the sintered ceramics was Ba(Mg1/3Ta2/3)O3 and the secondary phase Ba0.5TaO3 was presented depending on the La2O3 contents. SEM photographs suggested that La2O3 working as sintering additives promoted the densification and grain growth. Proper La3+ substituted for Ba2+ site in Ba(Mg1/3Ta2/3)O3, which led to the reduction of lattice parameters of Ba(Mg1/3Ta2/3)O3. And the result had positive effect on the dielectric properties, especially the Q × f value. As increasing La2O3 content from 0 to 5 wt%, the dielectric constant (ε r ) increased from 24.9 to 26.3, and the Q × f value increased first from 58,000 GHz to the peak value of 112,000 GHz (4 wt% La2O3) and thereafter decreased to 68,000 GHz. Meanwhile the temperature coefficient of resonant frequency (τ f ) decreased first to a minimum value and increased thereafter. At last, Ba(Mg1/3Ta2/3)O3 ceramics with 4 wt% La2O3 sintered at 1400 °C for 5 h had compact and homogeneous microstructure and possessed excellent microwave dielectric properties: high dielectric constant ε r  = 25.9, high Q × f = 112,000 GHz, and near-zero τ f  = +0.3 ppm/°C.

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Acknowledgements

Supported by Scientific Research Fund of Hunan Provincial Education Department (Grant Nos. 14A129, 13A091, 14C1013, 07C681), education Reform Project of Hunan Provincial Education Department (Grant No. 247 [2014]), the Project of the Hunan Provincial Planning of Educational Research (XJK014BGD073), the Project of Hunan Natural Science Foundation (Grant Nos. 14JJ7075, 15JJ2130), the Aid program for Science and Technology Innovative Research Team in Higher Educational Instituions of Hunan Province.

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Authors and Affiliations

  1. Hunan Provincial Key Laboratory of Information Service in Rural of Southwestern Hunan, Shaoyang University, Shaoyang, 422000, China

    Sen Peng, Jianming Xu, Tongcheng Huang, Gaofeng Luo, Jiankun Yu & Jianhua Zhou

  2. School of Energy Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Sen Peng & Mengqiang Wu

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  1. Sen Peng
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  2. Mengqiang Wu
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Correspondence to Mengqiang Wu or Jianming Xu.

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Peng, S., Wu, M., Xu, J. et al. Effect of La2O3 addition on the microwave dielectric properties of Ba(Mg1/3Ta2/3)O3 ceramics. J Mater Sci: Mater Electron 28, 3349–3355 (2017). https://doi.org/10.1007/s10854-016-5928-9

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