Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents

A comparative analysis of crystal structure, Raman spectra, and dielectric hysteresis loops was carried out for organic ferroelectric crystals of 2-methylbenzimidazole (MBI) grown from ethanol (MBIet), acetone (MBIac), deuterated acetone (MBId...

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Autores principales:	Elena Balashova, Aleksandr A. Levin, Alexander Fokin, Alexey Redkov, Boris Krichevtsov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	organic ferroelectrics powder XRD crystal structure Raman spectroscopy dielectric hysteresis loops polarization switching Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/b44ce1da09be454e98b3155cf62907db
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spelling	oai:doaj.org-article:b44ce1da09be454e98b3155cf62907db2021-11-25T17:17:36ZStructural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents10.3390/cryst111112782073-4352https://doaj.org/article/b44ce1da09be454e98b3155cf62907db2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1278https://doaj.org/toc/2073-4352A comparative analysis of crystal structure, Raman spectra, and dielectric hysteresis loops was carried out for organic ferroelectric crystals of 2-methylbenzimidazole (MBI) grown from ethanol (MBI<sub>et</sub>), acetone (MBI<sub>ac</sub>), deuterated acetone (MBI<sub>d-ac</sub>), or prepared by sublimation from gas phase (MBI<sub>gas</sub>). Raman spectroscopy shows identical frequencies of molecular vibrations in all studied crystals, proving the same molecular structure. At the same time, a detailed analysis of the asymmetry of the powder XRD reflection profiles indicates the presence of nano-scaled regions with the same MBI symmetry and crystal structure but slightly different sizes and unit cell parameters. The formation of the MBI modifications is associated with possible penetration of solvent molecules into the voids of the MBI crystal structure. Dielectric hysteresis loops in MBI<sub>et</sub> and MBI<sub>d-ac</sub> crystals at room temperature demonstrate significantly different values of coercive fields <i>E<sub>c</sub></i>. Analysis of hysteresis loops within the framework of the Kolmogorov-Avrami-Ishibashi (KAI) model shows that the polarization switching in MBI<sub>d-ac</sub> occurs much faster than in MBI<sub>et</sub> crystals, which in the KAI model is associated with different values of the characteristic frequency ω<sub>0</sub> and the activation field <i>E<sub>a</sub></i> of the domains wall motion.Elena BalashovaAleksandr A. LevinAlexander FokinAlexey RedkovBoris KrichevtsovMDPI AGarticleorganic ferroelectricspowder XRDcrystal structureRaman spectroscopydielectric hysteresis loopspolarization switchingCrystallographyQD901-999ENCrystals, Vol 11, Iss 1278, p 1278 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	organic ferroelectrics powder XRD crystal structure Raman spectroscopy dielectric hysteresis loops polarization switching Crystallography QD901-999
spellingShingle	organic ferroelectrics powder XRD crystal structure Raman spectroscopy dielectric hysteresis loops polarization switching Crystallography QD901-999 Elena Balashova Aleksandr A. Levin Alexander Fokin Alexey Redkov Boris Krichevtsov Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents
description	A comparative analysis of crystal structure, Raman spectra, and dielectric hysteresis loops was carried out for organic ferroelectric crystals of 2-methylbenzimidazole (MBI) grown from ethanol (MBI<sub>et</sub>), acetone (MBI<sub>ac</sub>), deuterated acetone (MBI<sub>d-ac</sub>), or prepared by sublimation from gas phase (MBI<sub>gas</sub>). Raman spectroscopy shows identical frequencies of molecular vibrations in all studied crystals, proving the same molecular structure. At the same time, a detailed analysis of the asymmetry of the powder XRD reflection profiles indicates the presence of nano-scaled regions with the same MBI symmetry and crystal structure but slightly different sizes and unit cell parameters. The formation of the MBI modifications is associated with possible penetration of solvent molecules into the voids of the MBI crystal structure. Dielectric hysteresis loops in MBI<sub>et</sub> and MBI<sub>d-ac</sub> crystals at room temperature demonstrate significantly different values of coercive fields <i>E<sub>c</sub></i>. Analysis of hysteresis loops within the framework of the Kolmogorov-Avrami-Ishibashi (KAI) model shows that the polarization switching in MBI<sub>d-ac</sub> occurs much faster than in MBI<sub>et</sub> crystals, which in the KAI model is associated with different values of the characteristic frequency ω<sub>0</sub> and the activation field <i>E<sub>a</sub></i> of the domains wall motion.
format	article
author	Elena Balashova Aleksandr A. Levin Alexander Fokin Alexey Redkov Boris Krichevtsov
author_facet	Elena Balashova Aleksandr A. Levin Alexander Fokin Alexey Redkov Boris Krichevtsov
author_sort	Elena Balashova
title	Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents
title_short	Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents
title_full	Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents
title_fullStr	Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents
title_full_unstemmed	Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents
title_sort	structural properties and dielectric hysteresis of molecular organic ferroelectric grown from different solvents
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b44ce1da09be454e98b3155cf62907db
work_keys_str_mv	AT elenabalashova structuralpropertiesanddielectrichysteresisofmolecularorganicferroelectricgrownfromdifferentsolvents AT aleksandralevin structuralpropertiesanddielectrichysteresisofmolecularorganicferroelectricgrownfromdifferentsolvents AT alexanderfokin structuralpropertiesanddielectrichysteresisofmolecularorganicferroelectricgrownfromdifferentsolvents AT alexeyredkov structuralpropertiesanddielectrichysteresisofmolecularorganicferroelectricgrownfromdifferentsolvents AT boriskrichevtsov structuralpropertiesanddielectrichysteresisofmolecularorganicferroelectricgrownfromdifferentsolvents
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Structural Properties and Dielectric Hysteresis of Molecular Organic Ferroelectric Grown from Different Solvents

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