This article is cited in 1 paper

Ferroelectricity

Structural evolution of diisopropylammonium chloride (DIPAC) molecular ferroelectric

N. I. Uskova^ab, E. V. Charnaya^b, D. Yu. Podorozhkin^b, S. V. Baryshnikov^cd, I. V. Egorova^c, A. Yu. Milinskiy<sup>c

a</sup> Saint-Petersburg State University of Aerospace Instrumentation
^b Saint Petersburg State University
^c Blagoveshchensk State Pedagogical University
^d Amur State University, Blagoveshchensk, Amur region

Abstract: Room-temperature changes in the structure of a new diisopropylammonium chloride (C$_{6}$H$_{16}$ClN, DIPAC) molecular ferroelectric have been investigated by high-resolution cross polarization/magic-angle spinning nuclear magnetic resonance (CP/MAS NMR) and X-ray diffraction (XRD) methods. The NMR measurements are carried out using $^{13}$C nuclei. Depending on time and heat treatment, monoclinic ferroelectric or orthorhombic nonpolar phases (as well as their coexistence) are observed. It is shown that the polar DIPAC modification at room temperature is transformed in the course of time into the nonpolar orthorhombic structure.

Keywords: diisopropylammonium chloride, DIPAC, organic ferroelectrics, $^{13}$C NMR, CP-MAS, phase transition, structural evolution.

Received: 30.01.2020
Revised: 30.01.2020
Accepted: 04.02.2020

DOI: 10.21883/FTT.2020.07.49472.016

 English version: Physics of the Solid State, 2020, 62:7, 1195–1198

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