Low-Temperature Monoclinic Phase in Epitaxial (001) Barium Titanate on (001) Cubic Substrates
نویسندگان
چکیده
The possibility of the existence of a low temperature monoclinic phase in epitaxial (001) BaTiO3 films on a (001) compressive substrate is analyzed theoretically and compared to recent experimental data from literature. There is good agreement between the theoretical findings and the experimentally observed behavior. The formation of the monoclinic phase arises from the point group reduction due to the rotation of the polarization vector commensurate with the variations in the in-plane strain state.
منابع مشابه
Controlling the structural transition at the Néel point of CrN epitaxial thin films using epitaxial growth
Chromium nitride CrN films were epitaxially grown on -Al2O3 0001 and MgO 001 substrates by pulsed laser deposition at 973 K under nitrogen radical irradiation, and the structural change of the films was investigated at around the Néel temperature of CrN 270 K by temperature-controlled x-ray diffraction experiments. Bulk cubic CrN is known to show monoclinic distortion below the Néel temperature...
متن کاملStress induced monoclinic phase in epitaxial BaTiO3 on MgO
We present a detailed strain analysis of epitaxial ferroelectric films taking into account multiple sources of strain, including the lattice mismatch between the film and the substrate, thermal strains due to differences in the thermal expansion coefficients of the film and the substrate, and relaxation by the formation of interfacial dislocations. The lattice parameters of the film are calcula...
متن کاملEpitaxial Lead Zirconate Titanate Nanocrystals Obtained by a Self-Patterning Method
Epitaxial lead zirconate titanate nanoislands were obtained by a self-patterning method using the instability of ultrathin films during high-temperature treatments. After high-temperature annealing, the as-deposited film breaks into islands with a narrow size distribution. Nanostructures, as small as 20 nm lateral size with a height of 9 nm, were epitaxially grown on Nb-doped (001) SrTiO3 subst...
متن کاملFabrication of Multiferroic Co-Substituted BiFeO3 Epitaxial Films on SrTiO3 (100) Substrates by Radio Frequency Magnetron Sputtering
The 10 at.% Co-substituted BiFeO₃ films (of thickness 50 nm) were successfully prepared by radio frequency (r.f.) magnetron sputtering on SrTiO₃ (100) substrates with epitaxial relationships of [001](001)Co-BiFeO₃//[001](001)SrTiO₃. In this study, a single phase Co-substituted BiFeO₃ epitaxial film was fabricated by r.f. magnetron sputtering. Sputtering conditions such as Ar, O₂ gas pressure, a...
متن کاملBarium titanate as a ferroelectric and piezoelectric ceramics
Barium titanate is a member of a large family of compounds with the general formula ABO3 called perovskites, as the crystal size of barium titanate increases and at critical crystalline size crystal structure of barium titanate transformed from cubic to tetragonal. Transformation of crystal structure is also take place at Curi temperature. Cubic structure show paramagenatic behavior while tetra...
متن کامل