When was added to Ti-excess ((Ba+Y)/Ti =1), the area occupied by 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 () in system. A donor-doped behavior was observed at various Y contents ( mol% Y) when was added to -excess . As Y content was increased, (002) and (200) peaks shifted to higher angles and the lattice constant (a and c axis) decreased gradually.

• Kim
• Jong-Han
• Han
• Young-Ho