Effects of La doping on the cubic-tetragonal phase transition and short-range ordering in PbTiO3
SCIE
SCOPUS
- Title
- Effects of La doping on the cubic-tetragonal phase transition and short-range ordering in PbTiO3
- Authors
- Kim, TY; Jang, HM; Cho, SM
- Date Issued
- 2002-01-01
- Publisher
- AMER INST PHYSICS
- Abstract
- Effects of cation-site vacancies on the characteristics of the cubic-tetragonal displacive transitions in La-modified PbTiO3 (PLT) were studied using in situ XRD measurements and Raman scattering. For this purpose, two distinct types of PLT series having cation-site vacancies either at the A site (PLT-A) or at the B site (PLT-B) were separately prepared. The PLT-A series exhibited normal ferroelectricity and underwent the cubic-to-tetragonal structural transition for La substitution up to 30 at. %. Contrary to this, the PLT-B became a typical relaxor with the absence of the macroscopic cubic-tetragonal transition. However, for both types of PLTs, Raman-forbidden bands appeared in the high-temperature cubic-phase field at 30 at. % La modification. These observations were attributed to the formation of short-ranged clusters with tetragonal symmetry in a globally cubic matrix and to the reduced dipolar interaction between the clusters in the PLT-B, as compared with the PLT-A. (C) 2002 American Institute of Physics.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/10519
- DOI
- 10.1063/1.1421206
- ISSN
- 0021-8979
- Article Type
- Article
- Citation
- JOURNAL OF APPLIED PHYSICS, vol. 91, no. 1, page. 336 - 343, 2002-01-01
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