Raman Spectroscopic Evidence of a Coherent Room Temperature Hybrid Structure of BaTiO_3 Single Crystal

• Authors: E. Liarokapis , A. Antonakos , A. Kojima , Y. Yoshimura
• Languages of publication: EN

Abstracts

EN

Recently, a precession X-ray study has discovered that ferroelectric BaTiO_3 single crystals have a coherent hybrid structure that consists of tetragonal and monoclinic lattices that share the (101) face of the tetragonal [11, 12]. Microscopic observations attest that the single crystal has two kinds of stripes (dark and white regions). Raman spectra of all sides of the cubic crystal have been collected at several scattering configurations. Two kinds of domains have been observed by the Raman measurements within the stripes, which are identified as light and dark spots under the optical microscope. The spectra structures and line widths are strongly affected when the laser direction is parallel to the b-axes and the polarization parallel to the a- or c-axes of the 90° domain (ac-side). It appears that there is a symmetry reduction and disorder, which affects the Raman active phonons. The results are in agreement with the coexistence of the two (tetragonal and monoclinic) lattices.

Keywords

EN

78.30.-j; 77.80.Dj; 63.50.-x

Discipline

• 77.80.Dj: Domain structure; hysteresis(for domain structure and hysteresis in ferromagnetic materials, see 75.60.-d)
• 63.50.-x: Vibrational states in disordered systems
• 78.30.-j: Infrared and Raman spectra(for vibrational states in crystals and disordered systems, see 63.20.-e and 63.50.-x, respectively; for Raman spectra of superconductors, see 74.25.nd)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 1
• Pages: 68-71

Dates

published

2009-07

Contributors

author

E. Liarokapis

• Department of Physics, National Technical University, GR-15780 Athens, Greece

author

A. Antonakos

• Department of Physics, National Technical University, GR-15780 Athens, Greece

author

A. Kojima

• Department of Material Science, The University of Shiga Prefecture, Hikone, Shiga 522-8533, Japan

author

Y. Yoshimura

• Faculty of Science and Engineering, Ritsumeikan University, Kyoto, Shiga 522-8533, Japan

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Identifiers

DOI

10.12693/APhysPolA.116.68