Ferroelastic phase transitions by 14N NMR spectra in [N(CH3)4]2CoCl4 and [N(CH3)4]2ZnCl4 single crystals. (September 2016)

• Record Type: Journal Article
• Authors: Lim, Ae Ran
• Is Part Of: Solid state communications. Volume 242(2016)
• Page Start: 25
• Page End: 29
• Publication Date: 2016-09
• Subjects: [N(CH3)4]2CoCl4 -- [N(CH3)4]2ZnCl4 -- Nuclear magnetic resonance -- Ferroelasticity -- Phase transition; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2016.05.009
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: Changes in the structural geometry of [N(CH3 )4 ]2 BCl4 (B=Co and Zn) crystals near the phase transition temperatures were studied by analyzing the 14 N nuclear magnetic resonance (NMR) spectra. Two physically inequivalent a-N(1)(CH3 )4 and b-N(2)(CH3 )4 groups were observed in these spectra. Abrupt changes in the resonance frequency and splitting of 14 N NMR signals near the phase transition temperatures were attributed to structural phase transitions, and the primary mechanism of these phase transitions exhibited ferroelastic characteristics. In addition, ferroelasticity of [N(CH3 )4 ]2 BCl4 was identified at low temperatures using optical polarizing microscopy. Graphical abstract: Highlights: Changes in the structural geometry. Two crystallographically different ions a-N(1)(CH3 )4 and b(2)-N(CH3 )4 . The existence of ferroelastic properties at low temperatures.