A novel co-crystallization molecular ferroelectric induced by the ordering of sulphate anions and hydrogen atoms
| Autor: | Chang-Shan Yang, Ji-Xing Gao, Yun Zhi Tang, Chang-Feng Wang, Chao Li, Jian-Bo Xiong |
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| Rok vydání: | 2018 |
| Předmět: |
Arrhenius equation
Phase transition Materials science 02 engineering and technology Activation energy Dielectric 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity 0104 chemical sciences law.invention Inorganic Chemistry Crystallography symbols.namesake Differential scanning calorimetry law symbols Dielectric loss Crystallization 0210 nano-technology |
| Zdroj: | Inorganic Chemistry Frontiers. 5:2413-2419 |
| ISSN: | 2052-1553 |
| DOI: | 10.1039/c8qi00424b |
| Popis: | Molecular ferroelectrics based on co-crystallization complexes have been very seldom reported before. Here we present the interesting case of the co-crystallization copper complex [EG]·[Cu(phen)2·SO4], 1 (EG = ethylene glycol, phen = 1,10-phenanthroline), which displays a reversible paraelectric–ferroelectric phase transition at 272 K. 1 undergoes symmetry breaking from C2/c to Cc at around 272 K which is triggered by the disorder–order transition of sulphate anions and hydrogen bonds. The real component of the dielectric constant versus temperature shows very large maxima for dielectric anomalies, corresponding to the phase transition. The activation energy is about 84.2 kJ mol−1, which can be calculated using the Arrhenius equation τ = τ0 exp(Ea/kBT) in a graph of dielectric loss changes with temperature at different frequencies. The measurement of ferroelectric properties shows a maximum spontaneous polarization (Ps) of ca. 3.18 μC cm−2 with a coercive field (Ec) of 1.2 kV cm−1. The phase transition sequence of 1 was further verified by differential scanning calorimetry (DSC) with one heat anomaly peak observed at around 272 K. |
| Databáze: | OpenAIRE |
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