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Temperature Coefficient of Dielectric Constant in CaTiO3-A(B′, B″)O3 Microwave Dielectric Ceramics (A=Ca, La, Li, B′=Al, Fe, Mg, B″=Nb, Ta)

Kim, Jeong-Seog   (Department of Materials Science and Engineering, Hoseo UniversityUU0001560  ); Cheon, Chae-Il   (Department of Materials Science and Engineering, Hoseo UniversityUU0001560  ); Park, Chan-Sik   (R & D Center, Acetronix Co.  ); Byun, Jae-Dong   (Department of Materials Engineering, Korea UniversityUU0000159  );
  • 초록

    The dielectric polarizability-related factors contributing to the $\tau$ $_{\varepsilon}$ have been analysed in terms of dielectric permittivity $\varepsilon$ , Tolerance Factor (TF), and octahedron tilt angles in (1-x)CaTi $O_3$ -x[A(B', B″) $O_3$ ] (A=Ca, La, Li, B'=Al, Fe, Mg, B″=Nb, Ta) and (S $r_{0.2}$ C $a_{0.8}$ )( $Ti_{1-x}$ Z $r_{x}$ ) $O_3$ . All the compounds have the orthorhombic Pbnm structure except the end members A(B', B″) $O_3$ and the solid solutions of x $\geq$ 0.8. The additional dipole field effect is suggested as a dominant factor contributing to $\tau$ $_{\varepsilon}$ in CaTi $O_3$ -based ceramics having relatively large $\varepsilon$ , which has not been generally considered in the previous reports dealing with the $\tau$ $_{\varepsilon}$ . This study has been focussed on delineating the dipole field effect on the $\tau$ $_{\varepsilon}$ in comparison to the octahedron tilt effect in CaTi $O_3$ -based ceramics.cs..cs.


  • 주제어

    Temperature coefficient of dielectric constant .   Crystal structure .   Dipole field effect .   Octahedron tilt angle .   $CaTiO_3$-based perovskite.  

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