Title :
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
Abstract :
Microwave dielectric properties of Ca0.85Nd0.1TiO3- 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; Ca0.85Nd0.1TiO3-DyAlO3; Ca0.85Nd0.1TiO3-ErAlO3; Ca0.85Nd0.1TiO3-GdAlO3; Ca0.85Nd0.1TiO3-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;
Conference_Titel :
Applications of Ferroelectrics, 2007. ISAF 2007. Sixteenth IEEE International Symposium on
Conference_Location :
Nara
Print_ISBN :
978-1-4244-1334-8
Electronic_ISBN :
1099-4734
DOI :
10.1109/ISAF.2007.4393317
