Short-ranged clusters with tetragonal symmetry in La-modified PbTiO3 relaxor ferroelectrics
SCIE
SCOPUS
- Title
- Short-ranged clusters with tetragonal symmetry in La-modified PbTiO3 relaxor ferroelectrics
- Authors
- Kim, TY; Jang, HM; Cho, SM
- Date Issued
- 2001-01
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Abstract
- Microscopic features associated with the displacive cubic-to-tetragonal phase transition in La-modified PbTiO3 (PLT) were studied using Raman spectroscopy. For this purpose, we separately prepared two distinct types of PLT specimens having cation-site vacancies either at the A-site (PLT-A) or at the B-site (PLT-B). As the La-content increased to 30 at.%, the Raman-forbidden bands appeared in the cubic-phase for both types of PLTs. However, the PLT-A(30) exhibited a continuous narrowing of the bands with decreasing temperature through the cubic-to-tetragonal transition point while the PLT-B(30) relaxor did not show any appreciable variation in the line broadening. These observations were interpreted in terms of the formation of short-ranged clusters with tetragonal symmetry in a globally cubic matrix and of the reduced dipolar interaction between the polar clusters in the PLT-B, as compared with the PLT-A. (C) 2001 Elsevier Science Ltd. All rights reserved.
- Keywords
- ferroelectrics; phase transitions; phonons; LEAD-ZIRCONATE-TITANATE; DIELECTRIC RESPONSE; MAGNESIUM NIOBATE; RAMAN-SCATTERING; TRANSITION; PHASE; CRYSTALS; CERAMICS; SILICON; PHONON
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19440
- DOI
- 10.1016/S0038-1098(01)00274-5
- ISSN
- 0038-1098
- Article Type
- Article
- Citation
- SOLID STATE COMMUNICATIONS, vol. 119, no. 8-9, page. 527 - 532, 2001-01
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