Pb(B-1/2'B-1/2'')O-3-type perovskites .1. Pair-correlation theory of order-disorder phase transition
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SCOPUS
- Title
- Pb(B-1/2'B-1/2'')O-3-type perovskites .1. Pair-correlation theory of order-disorder phase transition
- Authors
- Jang, HM; Kim, SC
- Date Issued
- 1997-08
- Publisher
- MATERIALS RESEARCH SOCIETY
- Abstract
- The limitation of the long-range order parameter and the necessity of the short-range order parameter for the thermodynamic description of Pb(B-1/2'B-1/2'')O-3-type perovskites are discussed. Based on the discussion, a statistical thermodynamic model that takes into account the configuration of the neighboring B-site ions (B' and B '' cations) was developed. A pair-correlation approximation was used in the calculation of the configurational entropy and the long-range coulombic interaction energy between the nearest B-site ions. The theoretical calculations using Pb(Sc1/2Ta1/2)O-3 (PST) and Pb(Sc1/2Nb1/2)O-3 (PSN) systems indicate that the short-range order parameter persists over a wide range of temperatures examined (0-1800 K) and that there possibly occur consecutive long-range order-disorder transitions in the configuration of B-site cations. The possibility of the existence of short-range ordering above the long-range order-disorder transition temperature was also examined using the annealed PSN specimen as a typical example of Pb(B-1/2'B-1/2'')O-3-type perovskites.
- Keywords
- LEAD-ZIRCONATE-TITANATE; FERROELECTRIC TRANSITION; RELAXOR FERROELECTRICS; DIELECTRIC-PROPERTIES; PB(SC1/2TA1/2)O3; CERAMICS; TEM; PB(SC0.5TA0.5)O3; PB(SC1/2NB1/2)O3; SYSTEM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21250
- DOI
- 10.1557/JMR.1997.0284
- ISSN
- 0884-2914
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS RESEARCH, vol. 12, no. 8, page. 2117 - 2126, 1997-08
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