Nature of the Phase Transition in KTaO3 with Random Site Impurities
- 1 January 1985
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 24 (S2)
- https://doi.org/10.7567/jjaps.24s2.80
Abstract
Recent results, including high pressure data, on the low temperature properties of KTa1-xNbxO3 (KTN) are presented and discussed. Most of the emphasis is on the question of whether the low temperature polar phase in dilute KTN (x≈0.02) arises from the spontaneous displacement of ions below T c (i.e. a static structural phase transition) or from the freezing of impurity-induced dipolar motion. Much of the evidence argues against a bulk equilibrium phase transition and suggests the coexistence of random dipole freezing and slowly relaxing ordered clusters which grow with decreasing T. The likelihood of a pressure-induced crossover from normal ferroelectric ordering to dipolar glass behavior in soft T O mode systems is discussed and possible evidence for such a phenomenon is presented.Keywords
This publication has 0 references indexed in Scilit: