Phase transition in potassium nitrate ferroelectric in a nanoporous matrix

Yu. F. Markov^a, V. M. Egorov^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 precision study of KNO$_3$ introduced into a silicate nanoporous matrix. Heat capacity peaks associated with ferroelectric phase transitions were found and examined. The characteristics of these transitions were examined in terms of the theory of diffuse phase transitions. A hypothesis was made that there exists a minimum size of pores in the nanocomposite at which KNO$_3$ is in the fully ferroelectric state at room temperature.

Keywords: phase transitions, ferroelectric, potassium nitrate, heat capacity.

Received: 28.04.2020
Revised: 28.05.2020
Accepted: 10.06.2020

DOI: 10.21883/PJTF.2020.18.49996.18361

 English version: Technical Physics Letters, 2020, 46:9, 905–908

Bibliographic databases:

•