| Author(s): |
Eric J. Cockayne; Benjamin P. Burton; L Bellaiche; |
| Title: |
Temperature-Dependent Behavior of PbSc1/2Nb1/2O3 From First Principles |
| Published: |
July 01, 2001 |
| Abstract: |
We study the ferroelectric phase transition in PbSc1/2Nb1/2O3 (PSN) using a first-principles effective Hamiltonian approach. Results for PSN with NaCl-type ordering of Sc and Nb on the B sites shows that a Pb-centered effective Hamiltonian is appropriate for the ordered cell. We obtain a complete effective Hamiltonian for ordered PSN that has the form of effective Hamiltonians for simple perovskites. We modify the effective Hamiltonian to include the effects of Sc-Nb disorder by adding one additional term giving the effective force on the Pb site due to the nearest neighbor B-site cations. Monte Carlo simulations of our model shows that disordered PSN has a lower Curie temperature than ordered PSN, in agreement with a previous first-principles study based on a virtual crystal approach. No evidence for relaxor behavior is seen in our model. |
| Conference: |
AIP Conference Proceedings |
| Proceedings: |
Workshop on Fundamental Physics of Ferroelectrics | 11th | Fundamental Physics of Ferroelectrics 2001: 11th Williamsburg Workshop |
| Volume: |
582 |
| Dates: |
February 4-7, 2001 |
| Keywords: |
dielectric permittivity;ferroelectric phase transitions;lead scandium niobate;PSN;relaxor ferroelectrics |
| Research Areas: |
Physics, Condensed Matter Physics, Phase Diagrams |
