Ferroelastic phase transition with large spontaneous strain caused by freezing the conformational dynamics of ammonium. Issue 7 (18th February 2022)

• Record Type: Journal Article
• Authors: Li, Li-Ting; Ji, Cui-Xian; Sun, Ying-Xi; Jin, Ya-Wei; Ni, Guo-Hao; Sun, Jia-Yue; Han, Rui-Rui; Zhao, Jiong-Peng; Liu, Fu-Chen
• Is Part Of: Inorganic chemistry frontiers. Volume 9:Issue 7(2022)
• Page Start: 1380
• Page End: 1385
• Publication Date: 2022-02-18
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2qi00114d
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : Through the structural regulation of long chain organic ammonium in a confined space, a ferroelastic phase transition with large spontaneous strain is realized. Abstract : By adjusting the substituent group of the organic ammonium in three molecular ionic complexes, [A][Fe3 O(O2 CH)8 (H2 O)]2 (A = NH3 (CH2 )3 NH3 for 1, CH3 NH2 (CH2 )3 NH3 for 2 and CH3 CH2 NH2 (CH2 )3 NH2 CH2 CH3 for 3 ), crystallized in the 2/ m point group at room temperature with similar structure, conformational transformation-caused dynamic disorder and pseudosymmetry is realized in 3 . When the conformational interchange of the ammonium is frozen, the disorder–order 2/ mF 1̄ ferroelastic phase transition is presented, which leads to dielectric relaxation and a large spontaneous strain of 0.207.