Tinte, Silvia ; Burton, B. P. ; Cockayne, Eric ; Waghmare, U. V. (2006) Origin of the relaxor state in Pb(BxB1−x')O3 perovskites Physical Review Letters, 97 (13). 137601_1-137601_4. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v97/i13/e137601
Related URL: http://dx.doi.org/10.1103/PhysRevLett.97.137601
Abstract
Molecular dynamics simulations of first-principles-based effective Hamiltonians for Pb(Sc½Nb½)O3 under hydrostatic pressure and for Pb(Mg⅓Nb⅔)O3 at ambient pressure show clear evidence of a relaxor state in both systems. The Burns temperature is identified as the temperature below which dynamic nanoscale polar clusters form, pinned to regions of quenched chemical short-range order. The effect of pressure in Pb(Sc½Nb½)O3 demonstrates that the stability of the relaxor state depends on a delicate balance between the energetics that stabilize normal ferroelectricity and the average strength of random local fields which promote the relaxor state.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 59399 |
| Deposited On: | 06 Sep 2011 05:29 |
| Last Modified: | 06 Sep 2011 05:29 |
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