Do SnI4 molecules deform on heating and pressurization in the low-pressure crystalline phase?

Do SnI4 molecules deform on heating and pressurization in the low-pressure crystalline phase?
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SnI4 分子在低压结晶相中加热和加压时会变形吗?

DOI:
10.1088/1361-648x/ab4cbc
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发表时间:
2019
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
Saitoh Hiroyuki
Saitoh Hiroyuki
中科院分区:
--
文献类型:
--
作者:
Naruta Hiroki;Fuchizaki Kazuhiro;Wakabayashi Daisuke;Suzuki Akio;Ohmura Ayako;Saitoh Hiroyuki

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一个SnI 4分子降低其对称性从Td到液-液转变。由于可以在不违反晶体对称性的情况下降低分子对称性,因此值得研究变形是否发生在晶相场中。扩展X射线吸收精细结构(EXAFS)测量的结晶状态进行了调查的Sn原子周围的环境在高压和高温下的变化。我们无法找到明确的证据,对对称性变化的分子,甚至接近熔点,那里的熔化曲线变得异常平坦的压力。事实上,当我们假设Sn原子的配位数在所研究的温度和压力范围内保持不变时,没有发现不一致。当系统在压缩时进入高压结晶相时,情况仍然如此。我们可以提出一个一致的方案,以结构变化的相变。SnI 4分子的不可压缩性可以适当地量化。该过程使我们能够得出结论,分子是超过一个数量级的不可压缩比晶格。
A SnI 4 molecule lowers its symmetry from T d to on the liquid–liquid transition. Because it is possible to lower the molecular symmetry without violating the crystalline symmetry, it is worth examining whether the deformation occurs in the crystalline phase field. Extended x-ray absorption fine structure (EXAFS) measurements on the crystalline state were carried out to investigate the change in the environment around a Sn atom at high pressures and temperatures. We could not find clear evidence on the symmetry change of molecules even close to the melting points, where the melting curve becomes abnormally flat against pressure. Indeed, no inconsistency was found when we assumed that the coordination number of a Sn atom remains unchanged in the temperature and pressure range examined. The situation remains true when the system entered the high-pressure crystalline phase on compression. We can propose a consistent scenario as to the structural change on the phase transformation. The incompressibility of a SnI 4 molecule could be suitably quantified. The procedure enabled us to conclude the molecule is more than an order of magnitude incompressible than the lattice.
通过穆斯堡尔效应研究晶体 SnI4 中 119Sn 的动力学性质
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