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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/038/05/1223-1229

    • 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

       
      Published
      September 2015
      Manuscript received
      7 April 2014
      Accepted
      7 April 2015

  • Bulletin of Materials Science | News

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      Posted on October 12, 2020

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      Physical Sciences 2020

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