Pb(B-1/2'B-1/2'')O-3-type perovskites .2. Short-range order parameter as a criterion of the distinction between relaxor and normal ferroelectrics
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SCOPUS
- Title
- Pb(B-1/2'B-1/2'')O-3-type perovskites .2. Short-range order parameter as a criterion of the distinction between relaxor and normal ferroelectrics
- Authors
- Kim, SC; Jang, HM
- Date Issued
- 1997-08
- Publisher
- MATERIALS RESEARCH SOCIETY
- Abstract
- A classification scheme of Pb(B-1/2'B-1/2'')O-3-type perovskites with respect to the B-site order parameters was proposed based on the theoretical calculation of the short-range order parameter (sigma) using the pair-correlation model. The calculated order parameters predict that a Pb(B-1/2'B-1/2'')O-3-type perovskite without any charge difference between B' and B '' cations [e.g., Pb(Zr1/2Ti1/2)O-3 (PZT)] is represented by a completely disordered state with the absence of a finite coherence length. On the other hand, a Pb(B-1/2'B-1/2'')O-3-type perovskite system having different ionic charges is characterized either by the short-range ordering with a nanoscale coherence length or by the macroscopic long-range ordering, depending on the magnitude of ionic charge difference between B' and B '' ions. The normal ferroelectricity in Pb(B-1/2'B-1/2'')O-3-type complex perovskites was then correlated either with a completely disordered state (sigma = 0) or with a perfectly ordered state (sigma = 1), whereas the relaxer behavior was attributed to the nanoscale short-range ordering (0 < sigma < 1) in the configuration of the B-site cations.
- Keywords
- DIFFUSE PHASE-TRANSITIONS; DISORDER; PB(SC1/2TA1/2)O3; TEM; PB(SC1/2NB1/2)O3; CERAMICS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21249
- DOI
- 10.1557/JMR.1997.0285
- ISSN
- 0884-2914
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS RESEARCH, vol. 12, no. 8, page. 2127 - 2133, 1997-08
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