High-and low-temperature dual ferroelasticity in a new hybrid crystal:(Me_(3)NCH_(2)CH_(2)OH)_(4)[Ni(NCS)_(6)]  

一例具有高低温双铁弹性的新型杂化晶体:(Me_(3)NCH_(2)CH_(2)OH)_(4)[Ni(NCS)_(6)]

作　　者：De-Xuan Liu Xiao-Xian Chen Zi-Ming Ye Wei-Xiong Zhang Xiao-Ming Chen 刘德轩;陈晓娴;叶子铭;张伟雄;陈小明(MOE Key Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,China)

机构地区：[1]MOE Key Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,China

出　　处：《Science China Materials》2022年第1期263-267,共5页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22071273 and 21821003);the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01C161).

摘　　要：Ferroelasticity,as a mechanical counterpart of ferroelectricity and ferromagnetism,describes the nonlinear response of strain to stress with a hysteresis loop[1].Ferroelastic phase features with two or more switchable orientation states of spontaneous strain[2,3],ensuring essential roles in shape memory,actuators,and mechanical switches[4].本文报道了一例具有反XeF4结构的新型杂化晶体(Me_(3)NCH_(2)-CH_(2)OH)_(4)[Ni(NCS)_(6)],其分子组分的较复杂有序-无序转变使得该化合物在269和360 K发生两步可逆相变.这两步相变伴随着P2_(1)/n-P4/mnc-Bmab的空间群变化,即分别属于正常的降温对称性破缺和反常的升温对称性破缺现象,因此使得该化合物可在低温和高温均展现出铁弹性(自发极化强度分别为0.0603和0.0073).这种不同寻常的高低温双铁弹性的发现和研究,有助于加深对反常对称性破缺相变的理解,并为今后在分子杂化晶体中探索高温铁性材料提供重要线索.

关 键 词：对称性破缺 可逆相变 铁弹性 高低温 杂化 NCS 

分 类 号：TB34[一般工业技术—材料科学与工程]