Calorimetric examination of the polarization cluster of the beginning ferroelectric material KTaO3
Abstract
The dynamics of KTaO3 is examined at low temperatures. By the analysis of the temporal behavior of the heat flow when the specimen is cooling, the total calorific capacity, the calorific capacities contained in the partial systems, and the relaxation times are determined in order to examine the beginning ferroelectric material KTaO3. The specific heat of this system was determined up to 140 mK. Experiments in electric field showed a thermal dissipation of the specimen. It was shown that dissipated heat does not originate from the quadrupole system, but is caused by dissipation effect, when spatial charges are moving in the specimen.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- September 1990
- Bibcode:
- 1990PhDT........14R
- Keywords:
-
- Ferroelectricity;
- Heat Measurement;
- Polarization (Charge Separation);
- Quadrupoles;
- Thermoelectric Cooling;
- Cryostats;
- Potassium Oxides;
- Relaxation Time;
- Specific Heat;
- Tantalum Oxides;
- Thermodynamics;
- Thermometers;
- Thermodynamics and Statistical Physics