Relaxation Process in Ferroelectrics near the Curie Temperature
Open Access
- 1 January 1968
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics Supplement
- Vol. E68, 109-136
- https://doi.org/10.1143/PTPS.E68.109
Abstract
A phenomenological approach is given to the problem of the relaxation process in ferroelectrics near the Curie temperature. It is shown that most of anomalous dielectric behaviours of order-disorder type ferroelectrics can be understood by assuming a distribution of relaxation times and their critical slowing down. A more microscopic approach to the same problem is also made for a specific model of KD2PO4 which is regarded as a kind of Ising spin system with two kinds of nearest neighbour interactions. Dynamical properties of this system are investigated on the basis of the Glauber's equation. In actual calculation, a time-dependent cluster approximation is employed. The system is shown to exhibit a relaxation process with two relaxation times, one tending to infinity as the Curie point is approached, the other being almost constant through the paraelectric phase.Keywords
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