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Microwave sintered lead free ferroelectric BZT-50BCT ceramics with higher Curie temperature and improved dielectric properties

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Abstract

Lead free ferroelectric Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3 ceramics with 95.2% of theoretical density and finer grains were obtained from chemically synthesized powders by microwave sintering at 1300 °C for 20 min. Microwave sintered ceramics showed higher density, higher Curie temperature (Tc) of 115 °C, higher dielectric permittivity of 2960, and minimized dielectric loss of 0.02. Whereas, the conventional sintered ceramics showed Curie temperature (Tc) of 95 °C, dielectric permittivity of 1813, and dielectric loss of 0.035. The higher Curie temperature along with improved dielectric properties might encourage practical applications of this composition as dielectric capacitors.

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Acknowledgements

Authors would like to thank Defence Research and Development Organization, Ministry of Defence, India, for financial support and thank Director, DMRL for his constant encouragement. The authors are also thankful to Dr. A. K. Singh, Scientist, DMRL for the help in powder XRD characterization. The help of Dr. P. Ghosal, Scientist, DMRL in microstructure characterization is greatly acknowledged.

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Authors and Affiliations

  1. Ceramics and Composites Group, Defence Metallurgical Research Laboratory, Hyderabad, 500058, India

    Seelam Rangaswamy Reddy, V. V. Bhanu Prasad, K. Prabahar & Subir Roy

  2. Department of Chemistry, National Institute of Technology, Warangal, 506004, India

    Seelam Rangaswamy Reddy & Vishnu Shanker

  3. Department of Physics, National Institute of Technology, Rourkela, India

    Pawan Kumar

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  1. Seelam Rangaswamy Reddy
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  2. V. V. Bhanu Prasad
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  3. Pawan Kumar
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  5. Vishnu Shanker
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  6. Subir Roy
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Correspondence to Subir Roy.

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Reddy, S.R., Prasad, V.V.B., Kumar, P. et al. Microwave sintered lead free ferroelectric BZT-50BCT ceramics with higher Curie temperature and improved dielectric properties. J Mater Sci: Mater Electron 29, 12451–12456 (2018). https://doi.org/10.1007/s10854-018-9362-z

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  • DOI: https://doi.org/10.1007/s10854-018-9362-z

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