Thermal and Elastic Properties of Kta.988Qonb.01203. At Low Temperatures

Specific heat, thermal conductivity, and ultrasonic data on KTa,98jNb.012O3 at low temperatures are reported. Neither the specific heat nor the thermal conductivity show anomalous behavior near the T^ = 18K transition temperature. The elastic compliance shows a dip at 18K. The combined evidence indicates that the transition is of the mean-field type where quantum fluctuations quench the anomalies usually associated with polar transitions. © 1981, Taylor & Francis Group, LLC. All rights reserved.