Lattice Strain in Epitaxial BaTiO3 Thin Films

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Appl. Phys. Lett.

DOI:https://doi.org/10.1063/1.2194231· OSTI ID:914234

He, F; Wells, B

We have investigated the out-of-plane lattice strain related to the ferroelectric transitions in epitaxial BaTiO3 (BTO) films using synchrotron x-ray diffraction. Under either compressive strain or tensile strain, there is evidence for two structural phase transitions as a function of temperature. The transition temperature TC is a strong function of strain, which can be as much as 100 K above the corresponding TC in bulk. Under compressive strain, the tetragonality of BTO unit cell implies that the polarization of the first ferroelectric phase is out of plane, while under tensile strain, the polarization is in plane. The transitions at lower temperature may correspond to the aa-->r or c-->r transitions, following the notations by Pertsev et al. The orientations of the domains are consistent with theoretical predictions.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 914234
• Report Number(s): BNL--78802-2007-JA
• Journal Information: Appl. Phys. Lett., Journal Name: Appl. Phys. Lett. Journal Issue: 15 Vol. 88; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
POLARIZATION
STRAINS
SYNCHROTRONS
THIN FILMS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
national synchrotron light source