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Structure and microwave dielectric properties of (Ba1 − xSm2x/3)((Co0.7Mg0.3)1/3Nb2/3)O3 ceramics

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Abstract

The sintering behavior, microstructure and microwave dielectric properties of (Ba1 − x Sm2x/3)((Co0.7Mg0.3)1/3Nb2/3)O3 (0.01 ≤ x ≤ 0.04) ceramics has been investigated. A small amount of Sm-substitution facilitates the densification of Ba (Co0.7Mg0.3)1/3Nb2/3O3 ceramics. All ceramic samples are well-sintered and the relative densities are beyond 97%. Small homogeneous grains and low porosity have been observed by scanning electron microscopy photograghs. Single-phase solid solutions are achieved in all compositions and no secondary phase was detected by X-ray diffraction patterns. The appropriate amount of Sm-substitution on A-site leads to the improved degree of 1:2 B-site cation ordering, while the ordered degree decreases gradually as the Sm content increases, which is related to the A-site deficiency caused by the inequitable substitution. The degree of 1:2 ordering structure is responsible for the microwave dielectric properties of the Sm-substituted samples, especially Q × f values. A good combination of microwave dielectric properties have been obtained for (Ba0.98Sm0.04/3)((Co0.7Mg0.3)1/3Nb2/3)O3 sintered at 1420 °C: ε r = 32.9, Q × f = 50309 GHz and τ f = 6 ppm/oC.

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Acknowledgements

This work was supported by Technology Projects of the Scientific Innovation Research of College Graduate in Jiangsu province (Project No. CXLX13_403), the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure (Project No. SKL201309SIC) and Science and Technology Projects of Guangdong Province (Project No. 2011A091103002), College Industrialization Project of Jiangsu Province (JHB2012-12), Scientific Research Project of Changshu Institute of Technology (XZ1522).

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Authors and Affiliations

  1. Department of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu, 215500, China

    Zhefei Wang, Jingyi Yao, Shilong Yin, Xuhong Wang & Lei Yu

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing, 210009, China

    Zhefei Wang

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  1. Zhefei Wang
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  2. Jingyi Yao
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Correspondence to Zhefei Wang.

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Wang, Z., Yao, J., Yin, S. et al. Structure and microwave dielectric properties of (Ba1 − xSm2x/3)((Co0.7Mg0.3)1/3Nb2/3)O3 ceramics. J Mater Sci: Mater Electron 28, 10277–10282 (2017). https://doi.org/10.1007/s10854-017-6795-8

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