Title :
Effect of occupational sites of rare-earth elements on the Curie point in BaTiO3
Author :
Kishi, H. ; Kohzu, N. ; Ozaki, N. ; Ohsato, H. ; Okuda, T.
Author_Institution :
Mater. Res. & Dev. Div., Taiyo Yuden Co. Ltd., Gunma, Japan
fDate :
28 May-1 June 2002
Abstract :
The relationship between the dielectric properties and the occupational sites of rare-earth ions in various rare-earth oxides and acceptors (Mg, Mn) substituted BaTiO3 was investigated. In the case of La, Sm, Gd and Yb doped samples, Tc decreased almost linearly with increasing doped content On the other hand, in the case of Dy, Ho and Er doped samples, Tc decreased in two stages. Furthermore, (Dy, Ho, Er, Yb)- and Mn-substituted samples showed the Tc shift by re-oxidation treatment, while (La, Sm)- and Mn-substituted samples showed no change. It was confirmed that the behaviors of the Tc shift were due to the change in predominant occupational site of rare-earth ions in BATiO3 lattice.
Keywords :
X-ray diffraction; barium compounds; differential scanning calorimetry; ferroelectric Curie temperature; ferroelectric ceramics; grain size; permittivity; solid solubility; solid solutions; BaTiO3; Curie point; DSC profile; dielectric constant; dielectric properties; electrical resistivity; grain size; high-temperature powder XRD; lattice parameter; multilayer ceramic capacitor; rare-earth element occupational sites; reoxidation treatment; solid solutions; solubility behavior; Cooling; Dielectric constant; Dielectric materials; Erbium; Lattices; Materials science and technology; Microstructure; Nonhomogeneous media; Research and development; Solids;
Conference_Titel :
Applications of Ferroelectrics, 2002. ISAF 2002. Proceedings of the 13th IEEE International Symposium on
Print_ISBN :
0-7803-7414-2
DOI :
10.1109/ISAF.2002.1195922
