|
|||||
|
|
Raman spectroscopy study of lattice dynamics of macro-, micro-, and nanostructured barium titanates |
|
| Authors: | O. A. Maslova F. V. Shirokov Yu. I. Yuzyuk M. El Marssi M. Jain N. Ortega R. S. Katiyar |
| Affiliation: | 1. Southern Federal University, ul. Bolshaya Sadovaya 105/42, Rostov-on-Don, 344006, Russia 2. Laboratoire de Physique de la Matière Condensée, Universite de Picardie Jules Verne, 33 rue Saint Leu, Amiens Cedex, 80039, France 3. Department of Physics, University of Connecticut, 2152 Hillside Road, Storrs, CT, 06269-3046, USA 4. Department of Physics and Institute for Functional Nanomaterials, University of Puerto Rico, San Juan, PR, 00931-3334, USA |
| Abstract: | The temperature dependences of the components A 1(2TO) and E(1TO) of the soft ferroelectric mode during phase transitions in single crystals, ceramics, polycrystalline and epitaxial thin films of barium titanate, as well as a superlattice consisting of alternating layers of barium and strontium titanates, have been studied using the Raman spectroscopy method. Abrupt changes in soft mode frequencies have been observed in the single crystal during phase transitions between tetragonal, orthorhombic, and rhombohedral phases. Smoothing of the temperature dependences of soft modes and the coexistence of phases have been observed in ceramics and polycrystalline films. In the epitaxial film, the sequence of structural transformations fundamentally differs from that observed in the single crystal; in the superlattice, the ferroelectric phase is stable to 550 K. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |