Effects of Y2O3 Addition on the Microstructure and Electrical Property of TiO2-Excess BaTiO3
When Y2O3 was added to Ti-excess BaTiO3 ((Ba+Y)/Ti =1), the the area occupied by Y3+ ion was confirmed by its microstructure development, electrical conductivity behavior and lattice constant. Grain growth inhibition was observed when the content of donor dopant exceeded a critical value (x≈0.01) in BaTiO3+x(0.5Y2O3+TiO2) system. A donor-doped behavior was observed at various Y contents (0.2~3.0 mol% Y) when Y2O3 was added to TiO2-excess BaTiO3. As Y content was increased, (002) and (200) peaks shifted to higher angles and the lattice constant (a and c axis) decreased gradually. These results confirms that Y3+ ions preferentially occupy Ba sites when Ba/Ti < 1.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
J. H. Kim and Y. H. Han, "Effects of Y2O3 Addition on the Microstructure and Electrical Property of TiO2-Excess BaTiO3", Materials Science Forum, Vols. 534-536, pp. 1025-1028, 2007