Pb(B{prime}{sub 1/2}B{double_prime}{sub 1/2})O{sub 3}-Type perovskites: Part I. Pair-correlation theory of order-disorder phase transition
Journal Article
·
· Journal of Materials Research
- Department of Materials Science and Engineering
The limitation of the long-range order parameter and the necessity of the short-range order parameter for the thermodynamic description of Pb(B{sup {prime}}{sub 1/2}B{sup {prime}{prime}}{sub 1/2})O{sub 3}-type perovskites were discussed. Based on the discussion, a statistical thermodynamic model that takes into account the configuration of the neighboring B-site ions (B{sup {prime}} and B{sup {prime}{prime}} 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(Sc{sub 1/2}Ta{sub 1/2})O{sub 3} (PST) and Pb(Sc{sub 1/2}Nb{sub 1/2})O{sub 3} (PSN) systems indicate that the short-range order parameter persists over a wide range of temperature examined (0{approximately}1800K) 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{sup {prime}}{sub 1/2}B{sup {prime}{prime}}{sub 1/2})O{sub 3}-type perovskites. {copyright} {ital 1997 Materials Research Society.}
- OSTI ID:
- 542190
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 8 Vol. 12; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pb(B{sup {prime}}{sub 1/2}B{sup {prime}{prime}}{sub 1/2})O{sub 3}-type perovskites: Part II. Short-range order parameter as a criterion of the distinction between relaxor and normal ferroelectrics
Effect of local elastic strain on the structure of Pb-based relaxors: A comparative study of pure and Ba- and Bi-doped PbSc{sub 0.5}Nb{sub 0.5}O{sub 3}
Enhanced diffuse phase transition and defect mechanism of Na-doped Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3} relaxor ferroelectrics
Journal Article
·
Fri Aug 01 00:00:00 EDT 1997
· Journal of Materials Research
·
OSTI ID:542191
Effect of local elastic strain on the structure of Pb-based relaxors: A comparative study of pure and Ba- and Bi-doped PbSc{sub 0.5}Nb{sub 0.5}O{sub 3}
Journal Article
·
Mon Jun 01 00:00:00 EDT 2009
· Physical Review. B, Condensed Matter and Materials Physics
·
OSTI ID:21308700
Enhanced diffuse phase transition and defect mechanism of Na-doped Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3} relaxor ferroelectrics
Journal Article
·
Sun Jun 01 00:00:00 EDT 1997
· Journal of Materials Research
·
OSTI ID:508986