Studies of the heat capacity and thermal expansion of the Na0.95K0.05NbO3 solid solution | Научно-инновационный портал СФУ

Studies of the heat capacity and thermal expansion of the Na0.95K0.05NbO3 solid solution

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1134/S1063783414020115

Аннотация: The heat capacity and thermal expansion of ceramic samples of the Na0.95K0.05NbO3 solid solution have been investigated over a wide temperature range of 100-750 K. The observed anomalies in the heat capacity and thermal expansion at T (4) = 297 K, T (3) = 535 K, T (2) = 665 K, and T (1) a parts per thousand 710 K correspond to the sequences of phase transitions N -> Q -> G -> S -> T1. It has been shown that, as a result of the phase transitions, the unit cell volume at T (4) and T (2) decreases, and at T (3) and T (1), increases with increasing temperature. The directions of the shift of the phase transition temperatures induced by hydrostatic pressure have been determined. It has been established that all structural transformations are accompanied by relatively small variations in the entropy. Different mechanisms of the structural distortions have been discussed.

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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 56, Is. 2

Номера страниц: 367-372

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Gorev M.V. (Institute of Engineering Physics and Radio Electronics,Siberian Federal University)
  • Bondarev V.S. (Institute of Engineering Physics and Radio Electronics,Siberian Federal University)
  • Flerov I.N. (Institute of Engineering Physics and Radio Electronics,Siberian Federal University)
  • Raevskaya S.I. (Research Institute of Physics,Southern Federal University)
  • Ivliev M.P. (Research Institute of Physics,Southern Federal University)
  • Raevskii I.P. (Research Institute of Physics,Southern Federal University)

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