期刊
INORGANIC CHEMISTRY FRONTIERS
卷 3, 期 10, 页码 1306-1316出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6qi00260a
关键词
-
资金
- National Science Centre [2013/11/D/ST8/03297]
Two hybrid crystals imidazolium iodoantimonate(III) and iodobismuthate(III), (C3H5N2)(3)[Sb2I9] (ImIA) and (C3H5N2)(3)[Bi2I9] (ImIB), have been synthesized and characterized in a wide temperature range (100-350 K) by means of X-ray diffraction, dielectric spectroscopy, proton magnetic resonance (H-1 NMR), FT-IR spectroscopy and optical observations. They undergo two temperature induced solid-solid structural phase transitions. The first one, quasi-continuous (with temperature hysteresis below 1 K), occurs at 324 K in ImIA and 327 K in ImIB, and the second one, clearly of the first order, at 273/278 (cooling/heating) and 291/295 K, in ImIA and ImIB, respectively. Ferroelastic properties are maintained in low-temperature phases. Both materials are isomorphic in the corresponding phases. High temperature phase I has a hexagonal P63/mmc symmetry, and phase II has orthorhombic Cmcm. The crystal architecture is composed of discrete, face-sharing bioctahedra [M2I9](3-) (M: Sb, Bi) and imidazolium cations which are highly disordered over phases I and II. The dynamics of the imidazolium cations has a prominent impact on the stability of the particular phases.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据