title: Comparative study of phase transitions in BaTiO3 thin films grown on (001)- and (110)-oriented SrTiO3 substrate.
abstract: An increase of the Curie temperature, TC, was demonstrated for BaTiO3 (BTO) epitaxial thin films grown by a pulsed laser deposition technique on (001) and (110) SrTiO3 (STO) substrates. The T(C) values for the BTO films on (001) and (110) STO were determined, from the temperature dependence of the lattice constants, to be 720 and 550 K, respectively, both of which are higher than that for bulk BTO. The increase of T(C) for the film on (001) BTO is suggested to stem from a large tetragonal deformation with a tetragonality of ~1.02 due to a two-dimensional clamping effect, which persists even in the paraelectric phase. That for the (110) BTO film, on the other hand, could be caused by a one-dimensional clamping effect due to uniaxial strain.
authors: Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan.
authors: Takao
authors: T
authors: Shimizu
authors: Dai
authors: D
authors: Suwama
authors: Hiroki
authors: H
authors: Taniguchi
authors: Tomoyasu
authors: T
authors: Taniyama
authors: Mitsuru
authors: M
authors: Itoh