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

Bulletin of materials science

FEI LIU¹  XING WEI²  CHANG LAI YUAN³  JING JING QU²  XIAN PEI HUANG³ 

[1] School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, PR ChinaSchool of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$;Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China$$Department of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR ChinaDepartment of Information Engineering, Guilin University of Aerospace Technology, Guilin 541004, PR China$$;College of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$College of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR ChinaCollege of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, PR China$$

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

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

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 ($au_f$) 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$au_f sim 2.3$ ppm $^{circ}$C$^{�?1}$] after being sintered at 1500$^{circ}$C for 4 h.

【 授权许可】

Unknown