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Low loss and middle permittivity of (1 − x) Ca4La2Ti5O17–xNdAlO3 dielectric resonators with near-zero temperature coefficient of the resonant frequency

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Abstract

The crystal structures, microstructure and microwave dielectric properties of (1 − x) Ca4La2Ti5O17–xNdAlO3 (0 ≤ x ≤ 0.7) ceramic system have been investigated. The results show that all the compositions form single-phase ceramics. The microwave dielectric properties are strongly correlated with composition, sintering temperature, grain sizes and lattice defects. The cell volume decreases because of the substitution of Al3+ for Ti4+ and Nd3+ for La3+ which is associated with a decrease in the permittivity. With increase in x value, the permittivity (ε r ), temperature coefficient of resonant frequency (τ f ) and Q × f value decrease. A near-zero τ f is achieved at x = 0.6 with permittivity of 41.8 and Q × f value of 13,783 GHz.

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Acknowledgements

This study was supported by the Natural Science Foundation of Guangxi Province, China (2010GXNSFA013029).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, China

    Jie-chang Di, Guo-hua Chen, Mei-zhen Hou, Chang-lai Yuan, Hua-rui Xu & Chang-rong Zhou

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  1. Jie-chang Di
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  2. Guo-hua Chen
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  3. Mei-zhen Hou
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Correspondence to Guo-hua Chen.

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Di, Jc., Chen, Gh., Hou, Mz. et al. Low loss and middle permittivity of (1 − x) Ca4La2Ti5O17–xNdAlO3 dielectric resonators with near-zero temperature coefficient of the resonant frequency. J Mater Sci 47, 2271–2277 (2012). https://doi.org/10.1007/s10853-011-6039-x

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