Unusual Sequential Reversible Phase Transitions Containing Switchable Dielectric Behaviors in Cyclopentyl Ammonium 18-Crown-6 Perchlorate
| Autor: | Yi Liu, Yu-Hui Tan, Bin Wang, Jian-Bo Xiong, Ji-Xing Gao, Zhi-Feng Gu, Yun-Zhi Tang, Qing Xu |
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| Rok vydání: | 2016 |
| Předmět: |
Phase transition
General Chemical Engineering 18-Crown-6 Inorganic chemistry Protonation 02 engineering and technology General Chemistry Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Crystallography chemistry.chemical_compound Perchlorate Differential scanning calorimetry chemistry Materials Chemistry Symmetry breaking 0210 nano-technology Powder diffraction |
| Zdroj: | Chemistry of Materials. 28:4476-4482 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.6b01726 |
| Popis: | Multisequential reversible phase transitions based on molecular materials have important applications in ferroelastic materials, ferroeletric materials, switchable dielectric materials, and temperature-controlling materials. Here, we report that a new compound, [Hcpa-(18-crown-6)]+[ClO4]− (1) (where Hcpa represents protonated cyclopentylamine cations) displays unusual multisequential reversible phase transitions accompanied by switchable dielectric behaviors. The stepwise synergistic disordering of Hcpa cations and ClO4– anions leads to the sequential reversible phase transitions and symmetry breaking. These unusual reversible phase transitions were further confirmed by the variable-temperature powder X-ray diffractometry (PXRD), thermal anomalies of differential scanning calorimetry (DSC) measurements, and abrupt dielectric anomalies in the heating and cooling processes. |
| Databáze: | OpenAIRE |
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