Crystal structure and dielectric properties of Ca(0.85)Nd(0.1)TiO(3) - LnAlO(3) ceramics.
The microwave dielectric properties of Ca(0.85)Nd(0.1)TiO(3) - LnAlO(3) (Ln = Sm, Gd, Dy, Er) ceramics are investigated in this paper. The structural characteristics of the specimens were evaluated by Rietveld refinement of Xray diffraction (XRD) patterns and high-resolution transmission electron microscopy (HRTEM). Solid solution limits were dependent on the ionic radius of Ln(3+) ions. With the decrease of the ionic radius of the Ln(3+) ions, the thermal stability of the resonant frequency decreases. This can be attributed to the increased level of oxygen octahedral distortion caused by the increase in the B-site bond valence in the ABO(3) perovskite structure. The dielectric constant (K) and the quality factor (Qf) of the specimens were dependent on the polarizability and grain size, respectively.
Eung
S
S
Department of Materials Engineering, Kyonggi University, Suwon 443-760, Korea. eskim@kyonggi.ac.kr
Dong
H
H
Yang
Jun-Mo
JM
Hyung
S
S
Nur
I
I
Ohsato
Hitoshi
H
D002516:Ceramics / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D004553:Electric Conductivity; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation
D008567:Membranes, Artificial