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Title: Brillouin spectroscopic evidence for a relaxation mode in ferroelectric PbHPO4 and PbDPO4
Authors: Kuok, M.H. 
Ng, S.C. 
Lockwood, D.J.
Issue Date: 1995
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.
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
ISSN: 01631829
DOI: 10.1103/PhysRevB.51.8005
Appears in Collections:Staff Publications

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