Crystal Structure and Dielectric Properties of Ca0.85Nd0.1TiO3 LnAlO3 (Ln = Sm, Gd, Dy, Er) Ceramics

Author

Kim, E.S. ; Kang, D.H. ; Yang, J.M. ; Shin, H.S. ; Zahari, N.I. ; Ohsato, H.

Author_Institution

Kyonggi Univ., Suwon

fYear

2007

fDate

27-31 May 2007

Firstpage

523

Lastpage

524

Abstract

Microwave dielectric properties of Ca_0.85Nd_0.1TiO₃- LnAlO₃(Ln = Sm, Gd, Dy, Er) ceramics have been investigated. Structural characteristics of the specimens were evaluated by Retieveld refinement of XRD patterns and HRTEM. Solid solution limits were dependent on the ionic radius of Ln³⁺ ion. With the decrease of ionic radius of Ln³⁺ ions, the thermal stability of the resonant frequency (TCF) was decreased which could be attributed to the increase of oxygen octahedral distortion by the increase of B-site bond valence. The dielectric constant (K) and the quality factor (Qf) of the specimens were dependent on the polarizability and grain size.

Keywords

X-ray diffraction; calcium compounds; ceramics; crystal structure; dysprosium compounds; erbium compounds; gadolinium compounds; grain size; neodymium compounds; permittivity; polarisability; samarium compounds; solid solutions; thermal stability; transmission electron microscopy; Ca_0.85Nd_0.1TiO₃-DyAlO₃; Ca_0.85Nd_0.1TiO₃-ErAlO₃; Ca_0.85Nd_0.1TiO₃-GdAlO₃; Ca_0.85Nd_0.1TiO₃-SmAlO₃; HRTEM; Retieveld refinement; XRD patterns; bond valence; ceramics; crystal structure; dielectric constant; grain size; ionic radius; microwave dielectric properties; octahedral distortion; resonant frequency; solid solution; thermal stability; Bonding; Ceramics; Dielectric constant; Erbium; Neodymium; Q factor; Resonant frequency; Solids; Thermal stability; X-ray scattering;

fLanguage

English

Publisher

ieee

Conference_Titel

Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on

Conference_Location

Nara

ISSN

1099-4734

Print_ISBN

978-1-4244-1334-8

Electronic_ISBN

1099-4734

Type

conf

DOI

10.1109/ISAF.2007.4393317

Filename

4393317