Target Designing Phase Transition Materials through Halogen Substitution

Crystalline materials have received extensive attention due to their extraordinary physical and chemical properties. Among them, phase transition materials have attracted great attention in the fields of photovoltaic, switchable dielectric devices, and ferroelectric memories, etc. However, many of t...

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Bibliographic Details
Published in:Chemphyschem 2021-04, Vol.22 (8), p.752-756
Main Authors: Cheng, Hao, Yang, Meng‐Juan, Xu, Yu‐Qiu, Li, Meng‐Zhen, Ai, Yong
Format: Article
Language:English
Subjects:
Cations
Chemical properties
crystal design
Crystal structure
crystalline materials
Crystallinity
Ferroelectricity
halogen substitution
phase transition
Phase transitions
Potential energy
Substitutes
Temperature
Transition temperature
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Summary:Crystalline materials have received extensive attention due to their extraordinary physical and chemical properties. Among them, phase transition materials have attracted great attention in the fields of photovoltaic, switchable dielectric devices, and ferroelectric memories, etc. However, many of them suffer from low phase transition temperatures, which limits their practical application. In this work, we systematically designed crystalline materials, (TMXM)2PtCl6 (X=F, Cl, Br, I) through halogen substitution on the cations, aiming to improving phase transition temperature. The resulting phase transition of (TMXM)2PtCl6 (X=F, Cl, Br, I) get a significant enhancement, compared to the parent compound [(CH3)4N]2PtCl6 ((TM)2PtCl6). Such phase transition temperature enhancement can be attributed to the introduction of halogen atoms that increase the potential energy barrier of the cation rotation. In addition, (TMBM)2PtCl6 and (TMIM)2PtCl6 have a low symmetry and crystallize in the space group C2/c and P212121, respectively. This work highlights the halogen substitution in designing crystal materials with high phase transition temperature. Halogen matters! With chemical modification on the cationic moiety of the parent compound (TM)4PtCl6, the resulting halogen substituted crystals have low crystal symmetry and high phase transition temperature of 317 and 341 K for (TMBM)2PtCl6 and (TMIM)2PtCl6.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.202100040