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|Title:||Brillouin spectroscopic evidence for a relaxation mode in ferroelectric PbHPO4 and PbDPO4|
|Authors:||Kuok, M.H. |
|Source:||Kuok, M.H.,Ng, S.C.,Lockwood, D.J. (1995). Brillouin spectroscopic evidence for a relaxation mode in ferroelectric PbHPO4 and PbDPO4. Physical Review B 51 (13) : 8005-8011. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.51.8005|
|Abstract:||Brillouin spectra of ferroelectric PbHPO4 (Tc=310 K) and its deuterated isomorph PbDPO4 (Tc=462 K) have been measured as a function of temperature across their transition temperatures. Certain longitudinal acoustic waves are found to exhibit anomalous propagation in the vicinity of Tc. The relaxation times, τ0, for a noninteracting dipole are evaluated from the Brillouin shifts, based on a phenomenological approach. The τ0 values are the same in both PbHPO4 and PbDPO4, indicating that the ferroelectric transition is driven by an order-disorder relaxation mode. This study also reveals that the paraelectric phase symmetry is, on a macroscopic scale, centrosymmetric. © 1995 The American Physical Society.|
|Source Title:||Physical Review B|
|Appears in Collections:||Staff Publications|
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