Abstract
Abstract The successive phase transitions of KTa1−xNbxO3 (x = 0.3 and 0.4) (KTN) ceramics have been investigated by various techniques including DTA, dielectric, piezoelectric and pyroelectric measurements from 100 to 450 K. In this temperature range, all the phase transactions have been detected by pyroelectric measurements. All the phase transitions in KTa0.6Nb0.4O3 were detected by piezoelectric measurements as a function of temprature. The d31 piezoelectric coefficient presents around Tc a maximum value (of 20·10−12C/N). The DTA, dielectric and pyroelectric measurements allow to deduce that the ferroelectric-paraelectric phase transition is probably of first order for KTa0.6Nb0.4O3
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