No abstract

No abstract

Specific-heat data (at zero field and 15.6 kV/cm), dielectric data, and electrocaloric data measured on a KTa03 crystal between 2 and 25 K are reported. The zero-field specific heat is about 30 times larger than the Debye prediction (e~= 580 K) at these temperatures but shows no anomaly characteristic of a sharp phase transition as suggested by the neutron data. A very broad transition is possible around 10 K for which b, C = 0, 11 calmol 'K '. From the specific-heat diA'erence CD-C~, a soft-mode frequency of 22.9 cm ' is determined near 10 K. The electrocaloric effect consists of reversible and irreversible components. The reversible effect is in good thermodynamic agreement with the specific-heat and dielectric data and with published data on the Gibbs free-energy coeAicients. Both the irreversible eA'ect and the dielectric data indicate that KTa03 does not retain a center of symmetry at low temperatures.

Study on lattice dynamics of filled skutterudites InxYbyCo4Sb12 J. Appl. Phys. 112, 024909 (2012) Quasi-harmonic approximation of thermodynamic properties of ice Ih, II, and III J. Chem. Phys. 137, 044502 (2012) Development of a force field for zeolitic imidazolate framework-8 with structural flexibility J. Chem. Phys. 136, 244703 (2012) Interstitial doping induced superconductivity at 15.3K in Nb5Ge3 compound

No abstract