|
This article is cited in 1 scientific paper (total in 1 paper)
Phase transitions
Thermal effects in the vicinity of phase transition temperatures in matrix-isolated sodium nitrite NaNO$_{2}$
V. M. Egorova, Yu. F. Markova, E. M. Roginskiia, E. V. Stukovab a Ioffe Institute, St. Petersburg
b Amur State University, Blagoveshchensk, Amur region
Abstract:
Thermal effects in some nanoporous silicate matrices (with different pore sizes) loaded with ferroelectric NaNO$_{2}$ from both a saturated solution and from a melt have been studied in a wide temperature range including the phase transition temperatures. All the samples reliably demonstrate maxima of the heat capacity, corresponding to first-order ferroelectric phase transitions. The characteristics of the maxima (intensity, half-width, phase transition temperature, etc.) have been determined. A more complex situation is the observation of an incommensurable phase (sinusoidal antiferroelectric), in particular, in the case of pore sizes comparable to the period of an “incommensurable” wave, the manifestation of which can be explained by the appearance of a corresponding orientation of sodium nitrite nanocrystals in pores of these matrices. It is found that the characteristics of above noted effects depend on the prehistory of the samples under study.
Received: 16.11.2016
Citation:
V. M. Egorov, Yu. F. Markov, E. M. Roginskii, E. V. Stukova, “Thermal effects in the vicinity of phase transition temperatures in matrix-isolated sodium nitrite NaNO$_{2}$”, Fizika Tverdogo Tela, 59:7 (2017), 1355–1359; Phys. Solid State, 59:7 (2017), 1382–1386
Linking options:
https://www.mathnet.ru/eng/ftt9527 https://www.mathnet.ru/eng/ftt/v59/i7/p1355
|
Statistics & downloads: |
Abstract page: | 38 | Full-text PDF : | 11 |
|