• Sintering behaviour and microwave dielectric properties of a new complex perovskite: ($1−x$)(Sr$_{0.3}$Ca$_{0.427}$Nd$_{0.182}$)TiO$_{3−x}$SmAlO$_3$ ceramics

• # Fulltext

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

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

• # Bulletin of Materials Science

Volume 43, 2020
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019