Abstract
[100]-oriented KTa1−xNbxO3 (x=0.32) relaxor ferroelectric crystals have been studied by acoustic emission (AE) count rate Ṅ in the temperature range from 200 K to 700 K. Burns temperature Td=620 K (Ṅ = 1.7 −1) and intermediate temperature T*=310 K (Ṅ = 3.1 −1) as well as both the tetragonal-cubic TT-C=259 K (Ṅ = 4.0 −1) and orthorhombic-tetragonal TO-T=243 K (Ṅ = 5.0 −1) phase transition temperatures have been clearly detected. T* is found to be influenced by an external DC electric field E: T* essentially decreases with a slope of approximately − 60 K·cm/kV accompanied with weakening in Ṅ, as E enhances. The mechanisms of abnormal T*(E) and Ṅ(T) dependences are discussed.
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