Abstract
La 1/3TaO 3 was found to exhibit a perovskite structure in which two-thirds of A-cation sites are vacant. An ordered arrangement of vacancies causes the formation of a superstructure with doubled c-axis compared with a perovskite subcell. With small amount of Li addition, a superstructure with vacancies located at the (002) plane was still present. When Li ions were added into more than 20% of A-cation sites, the superstructure disappeared and the perovskite structure also changed from tetragonal to near cubic. When more than 60% of A-cation sites were incorporated by Li ions, a phase separation of cubic La 0.166Li 0.5TaO 3 perovskite and rhombohedral LiTaO 3 was observed. The phase separation was caused by the big difference of ionic radius between La and Li ions. The microstructure and microchemical analysis of (La,Li)TaO 3 were examined using scanning electron microscopy and EDX.
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