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    • Keywords


      0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3; microwave dielectric properties; microstructures; LiF.

    • Abstract


      The effects of LiF addition on sinterability, microstructure and microwave dielectric properties of 0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3 ceramics were investigated. The LiF addition enhanced the sintering temperature of 0.25Ca0.8Sr0.2TiO3–0.75Li0.5Nd0.5TiO3 ceramics from 1200 to 1300°C, because the LiF addition could compensate the evaporation of Li during the sintering process. It was found that the bulk density and dielectric constant (𝜀r) gradually decreased, the quality factor (𝑄f) greatly increased and the temperature coefficient of resonant frequency (𝜏f) shifted to a near-zero value with the increase in LiF addition. Obviously, excess Li addition could efficiently improve the microwave dielectric properties. In addition, 0.25Ca0.8Sr0.2 TiO3–0.75Li0.5Nd0.5TiO3 + 4.0 wt% LiF ceramics sintered at 1350°C for 4 h exhibited good microwave dielectric properties of 𝜀r ∼ 123.4, 𝑄f ∼ 2209 GHz (at 2.43 GHz) and 𝜏f ∼ 12.3 ppm °C–1.

    • Author Affiliations


      Fei Liu1 Changlai Yuan2 Xinyu Liu1 2 Jing Jing Qu3

      1. College of Material Science and Engineering, Central South University, Changsha 410083, PR China
      2. College of Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China
      3. Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China
    • Dates

  • Bulletin of Materials Science | News

    • 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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