Calorimetry of matrix-isolated sodium nitrite NaNO$_{2}$

V. M. Egorov^a, Yu. F. Markov^a, E. M. Roginskii^a, E. V. Stukova<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Amur State University, Blagoveshchensk, Amur region

Abstract: Differential scanning calorimetry has been used to carry out a high-precision study of sodium nitrite NaNO$_{2}$ incorporated into different silicate nanoporous matrices. Heat-capacity maxima due to smeared ferroelectric phase transitions have been discovered. Characteristics (intensity, half-width, phase-transition temperature, etc.) of the maxima have been investigated. Heat-capacity maxima related to an incommensurable phase transition have been reliably identified. The maxima can be attributed to the formation of appropriate orientation of sodium-nitrite nanocrystals in matrix pores.

Received: 17.06.2016

 English version: Technical Physics Letters, 2016, 42:11, 1114–1117

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