Reversible phase transition and switchable dielectric behaviors triggered by rotation and order-disorder motions of crowns
| Autor: | Yun-Zhi Tang, Chang-Feng Wang, Hai-Tao Zhou, Shao-Peng Chen, He-Rui Wen, Yu-Hui Tan, Yi Liu, Chang-Shan Yang |
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| Rok vydání: | 2018 |
| Předmět: |
Formamide
chemistry.chemical_classification Phase transition Materials science 02 engineering and technology Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Piezoelectricity 0104 chemical sciences Pyroelectricity Inorganic Chemistry chemistry.chemical_compound chemistry Chemical physics Hexafluorophosphate Molecule 0210 nano-technology Crown ether |
| Zdroj: | Dalton Transactions. 47:3851-3856 |
| ISSN: | 1477-9234 1477-9226 |
| DOI: | 10.1039/c8dt00003d |
| Popis: | Solid-to solid-state reversible phase transitions are widely used in switchable dielectrics, ferroelectrics, piezoelectrics, and pyroelectric and non-linear optical materials. Herein we report a new crown ether clathrate, [Habf-(18-crown-6)1.5]+ [PF6]- (Habf = p-ammonium benzene formamide) which shows an interesting reversible phase transition near room temperature (263 K). X-ray single crystal diffraction analysis shows that the synergetic rotation motion between the 18-crown-6 crown ethers and the order-disorder motions of both hexafluorophosphate guest anions and 18-crown-6 crown ether host molecules lead to the phase transition. This reversible phase transition is confirmed by an evident thermal anomaly behavior around 263 K. The apparent step-like dielectric change around the phase transition indicates that it has potential application in dielectric switches. |
| Databáze: | OpenAIRE |
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