本文报道了一例具有反XeF4结构的新型杂化晶体(Me3NCH2-CH2OH)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P21/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.
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This work was supported by the National Natural Science Foundation of China (22071273 and 21821003), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01C161).
Zhang WX, Chen XM and Liu DX conceived the idea, designed the experiments and co-wrote the manuscript; Liu DX engineered the samples; Liu DX, Chen XX and Ye ZM performed the experiments; all authors contributed to the general discussion.
Conflict of interest
The authors declare that they have no conflict of interest.
De-Xuan Liu was born in 1996 and obtained his BSc degree in 2018 at Sun Yat-Sen University (SYSU). He is a PhD candidate in inorganic chemistry at SYSU. His research is focused on functional hybrid compounds.
Wei-Xiong Zhang obtained his BSc degree in 2004 and PhD degree in 2009 at SYSU, and was a JSPS (Japan Society for the Promotion of Science) postdoc at Tohoku University from 2010 to 2012. He joined SYSU in 2012, and became a professor in 2018. His current research interest is in crystal engineering of multi-component dense crystals, especially the structural-phase-transition functional crystals and energetic crystals.
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Liu, DX., Chen, XX., Ye, ZM. et al. High- and low-temperature dual ferroelasticity in a new hybrid crystal: (Me3NCH2CH2OH)4[Ni(NCS)6]. Sci. China Mater. (2021). https://doi.org/10.1007/s40843-021-1794-1