Cubic to Tetragonal Phase Transformation of Ultrafine BaTiO_3 Crystallites at Room Temperature

概要

論文の詳細を見る
The critical crystallite size for the cubic (c-) to tetragonal (t-) phase transformation of ultrafine BaTiO_3 crystallites was examined. Crystallites were prepared by calcination of barium titanyl oxalate tetrahydrate (BTOT) at various temperatures as to obtain crystallites with different sizes. The c-BaTiO_3 crystallite which is thermodynamically considered as a high-temperature form can exist at room temperature if the crystallite is smaller than certain size. The critical size for the c→t phase transformation is 〜30 nm. The size may become larger if the crystallite suffers higher lattice strain which can be induced by different powder preparation methods.
社団法人応用物理学会の論文
1995-11-15