• Yan-Gai Liu

      Articles written in Bulletin of Materials Science

    • Influences of protective atmosphere on the characterization and properties of NaSr2Nb5O15 lead-free piezoelectric ceramics by sol–gel method

      Tian-Hang Zhang Yan-Gai Liu Jin-Qiu Zhao Zhao-Hui Huang Ming-Hao Fang

      More Details Abstract Fulltext PDF

      NaSr2Nb5O15 lead-free piezoelectric ceramics were prepared by the sol–gel method; they were sintered at different temperatures with or without protective atmosphere. The influences of sintering temperature and protective atmosphere on the characterization and properties of the ceramics were investigated. All the ceramics showed the pure tungsten bronze structure and an intermediate relaxor-like behaviour between normal and ideal relaxor ferroelectrics according to the modified Curie–Weiss law. The sintering temperature affected significantly the properties of ceramics, with the sintering temperature increased both with and without protective atmosphere, the 𝜀r, 𝑑33, 𝐾p and 𝑃r of these ceramics initially increased and decreased finally, whereas the variation of 𝑄m and 𝐸c showed the opposite tendency. Furthermore, the protective atmosphere also significantly affected the properties of these ceramics, 𝜀r, 𝑑33, 𝐾p and 𝑃r of such ceramics sintered with protective atmosphere were superior to those of the ceramics sintered without protective atmosphere, while the tan 𝛿, 𝑄m and 𝐸c gave the contrary results.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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      Posted on July 25, 2019

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