BaTiO_3/SrTiO_3歪超格子における構造変化と誘電特性 Structure Transformation and Dielectric Properties in BaTiO_3/SrTiO_3 Strained Superlattices
Structure changes and dielectric properties of strained artificial superlattices of BaTiO<SUB>3</SUB>/SrTiO<SUB>3</SUB> are discussed in this article. A large strain of 0.5-1GPa is introduced at the interface between BaTiO<SUB>3</SUB> and SrTiO<SUB>3</SUB> layers, and a large dielectric constant of 900 is observed with stacking periodicity of 2 unit cells/2 unit cells for the total thickness of 2000Å. The superlattices show drastically different dielectric behavior from that of the solid solution (Sr, Ba) TiO<SUB>3</SUB> films. Broad maxima of the dielectric constants occur around 40-50°C and the values remain large even at a temperature above 200°C.
日本結晶学会誌 37(3), 183-186, 1995-06-30
The Crystallographic Society of Japan