Temperature dependence on the domain structure of epitaxial PbTiO3 films grown on single crystal substrates with different lattice parameters. (23rd July 2020)

• Record Type: Journal Article
• Authors: Ehara, Yoshitaka; Nakashima, Takaaki; Ichinose, Daichi; Shimizu, Takao; Yamada, Tomoaki; Nishida, Ken; Funakubo, Hiroshi
• Is Part Of: Japanese journal of applied physics. Volume 59:Number SP(2020)
• Publication Date: 2020-07-23
• Subjects: EPITAXIAL THIN FILMS -- FERROELECTRICS -- DOMAIN STRUCTURE; Physics -- Periodicals; 621.05
• DOI: 10.35848/1347-4065/aba2bf
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Epitaxial PbTiO3 (PTO) thin films were deposited on different single crystal (100)KTaO3 [KTO], (110)DyScO3 [DSO], (110) GdScO3 [GSO] and (001)SrTiO3 [STO] substrates. Temperature dependence of the lattice parameters and the domain structure showed a systematic change with misfit strains ( S m ) of PTO films, explored by high-resolution X-ray diffraction measurements. Fully (001)-orientation films on STO and fully (100)-orientation films on KTO substrates were confirmed, and the elevated phase transition temperature ( T c ) was confirmed in PTO films induced by both large compressive (STO) and tensile strains (KTO). While, for PTO films grown on GSO substrates with small tensile strains, T c is similar to the powder data. And, ferroelastic domain structure changed from (100)-orientation to (100)/(001)-orientations was observed during decreased temperature. The temperature dependence of domain structures PTO films with the different S m are in good agreement with thermodynamic calculation for the temperature– S m diagram of ferroelastic domain structure.