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      https://www.ias.ac.in/article/fulltext/boms/039/07/1645-1649

    • Keywords

       

      (Sr$_{0.3}Ca$_{0.427}$Nd$_{0.182})TiO$_3$; SmAlO$_3$; microwave dielectric properties; oxygen octahedral distortion.

    • Abstract

       

      Structural features and microwave dielectric properties of ($1−x$)(Sr$_{0.3}$Ca$_{0.427}$Nd$_{0.182}$)TiO$_{3−x}SmAlO$_{3}($0.05 \le x \le 0.4$) ceramics were investigated. X-ray diffraction patterns illustrated that solid solutions with the orthorhombic perovskite were shown to be formed in the ranges of $0.05 \le x \le 0.4$. Moreover, the dielectric constant ($\epsilon_r$) of sintered ceramics had a quasi-linear decrease with the increase in SmAlO$_3$ content. A certain amount of Sm and Al substitution for A- and B-sites could substantially improve the quality factor ($Qf$) of the ceramics. Increasing the oxygen octahedral distortion led to a decrease in the temperature coefficient of the resonant frequency ($\tau_f$) from 216.3 to $−$34.8 ppm $^{\circ}$C$^{−1}$. Additionally, optimized microwave dielectric properties can be achieved for the specimens using 0.75(Sr$_{0.3}$Ca$_{0.427}Nd$_{0.182}$)TiO$_3$–0.25SmAlO$_3$ ceramics [$\epsilon_r \sim 58.3$, $Qf \sim 18800$ GHz (at 4.65 GHz) and$\tau_f \sim 2.3$ ppm $^{\circ}$C$^{−1}$] after being sintered at 1500$^{\circ}$C for 4 h.

    • Author Affiliations

       

      JING JING QU1 FEI LIU2 XING WEI1 CHANG LAI YUAN3 XIAN PEI HUANG3

      1. Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China
      2. School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China
      3. College of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China
    • Dates

       
  • Bulletin of Materials Science | News

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