期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 8, 页码 2534-2537出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201411005
关键词
ammonium metal formate; dielectricity; metal-organic frameworks; multiple unit cell; phase transition
资金
- NSFC [21171010, 21290170, 21290171, 21321001]
- National Basic Research Program of China [2013CB933401]
An ammonium Mg formate framework, prepared by using di-protonated 1,3-propanediamine (pnH(2)(2+)), has a rare three-dimensional binodal (4(12)6(3))(4(9)6(6))(3) Mg-formate framework with elongated cavities accommodating pnH(2)(2+)H(2)OpnH(2)(2+) assemblies. It displays a para-electric to antiferroelectric phase transition at 275K, with a 36-fold multiple unit cell from the high-temperature cell of 1703 angstrom(3) to the low-temperature one of 60980 angstrom(3). The change results from the disorder-order transition of the pnH(2)(2+) cations and H2O molecules. The motions of these components freeze in a stepwise fashion on going from the high-temperature disorder state to the low-temperature ordered state, triggering the switch from high to low dielectric constants, and the spatial limitation of such motions contributes the strong dielectric anisotropy.
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