期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 9, 期 9, 页码 2158-2163出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b00597
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资金
- Natural Science Foundation of China [21701023]
- Natural Science Foundation of Jiangsu Province [BK20170660]
- Fundamental Research Funds for the Central Universities [3207047407]
- PAPD of Jiangsu Higher Education Institutions
A thermal-induced dielectric switching has been realized in two ion pair crystal [C2H6N5](+)center dot[H2PO4](-) (1, C2H6N5 = 3,5-diamino-1,2,4-triazolinium) through single-crystal-to-single-crystal phase transition (SCSC-PT). Upon cooling from room temperature, the 1D cation stripes that are composed of [C2H5N5](+) cations have undergone a 90 degrees sharp rotation around the c axis, accompanied by the transition of crystal stacking from loose unparallel (dynamic state) to compression parallel (static state) and reorientation of dipoles on the [C2H5N5](+) cation, which thus resulted in high dielectric state to low dielectric state transformation. While on the warming run, the reverse process was rather sluggish, resulting in a reversible dielectric switching with ultralarge (about 40K wide) hysteresis loop near room temperature. It is thought that the large-sized polar cation stripes have a predominant influence on the switching properties of 1.
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