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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Structure of Plastic Crystalline Succinonitrile: High-Resolution in situ Powder Diffraction
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Structure of Plastic Crystalline Succinonitrile: High-Resolution in situ Powder Diffraction

机译:塑料结晶丁二腈的结构:高分辨率原位粉末衍射

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摘要

The temperature dependent (150-290 K) crystal structure of the low-temperature cc-phase. and high temperature beta-phase, of succinonitrile hits been determined by high resolution it) situ powder diffraction. The alpha-phase has a monoclinic unit cell that contains four gauche molecules and belongs to the P2(1)/a space group. The crystal undergoes a reversible first-order phase transition at 233 K into the high temperature beta-phase. The lattice parameters increase with temperature and the phase transition leads to an abrupt 6.7% increase in volume. The beta-phase crystallizes into it bcc-structure that belongs to the Im (3) over barm space group. The high temperature phase however, is a highly disordered plastic crystal at room temperature that contains both gauche and trans molecules. The non-linearity in the overall isotropic temperature-factor indicates other possible phase transitions in the temperature range of 233-250 K.
机译:低温cc相的温度相关(150-290 K)晶体结构。通过高分辨率的原位粉末衍射测定丁二腈的高温和β-相的温度。 α相具有一个包含四个gauche分子的单斜晶胞,并且属于P2(1)/一个空间群。晶体在233 K处经历可逆的一阶相变,进入高温β相。晶格参数随温度增加,相变导致体积突然增加6.7%。 β相结晶成bcc结构,属于barm空间群上的Im(3)。然而,高温相在室温下是高度无序的塑料晶体,同时包含薄纱和反式分子。整体各向同性温度因数的非线性表明在233-250 K的温度范围内其他可能的相变。

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