首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Investigation of the changes in hydrogen bonding accompanying the structural reorganization at 103 K in ammonium iodate
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Investigation of the changes in hydrogen bonding accompanying the structural reorganization at 103 K in ammonium iodate

机译:在碘酸铵103k中伴随结构重组的氢键变化的研究

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Neutron powder diffraction has been used to observe the changes in hydrogen bonding that occur as a function of temperature in ND_4IO_3 and, thus, determine the structural features that occur during the low-temperature (103 K) phase transition. It is shown that in the deuterated material the change is not a phase change per se but rather a structural reorganization in which the hydrogen bonding becomes firmly locked in at the phase transition temperature, and stays in this configuration upon further cooling to 4.2 K. In addition, both the differences and changes in the axial thermal expansion coefficients in the region 100-290 K can be explained by the changes involving both the hydrogen bonding and the secondary I···O halogen bonds.
机译:中子粉末衍射已经用于观察在ND_4OO_3中的温度的函数中发生的氢键的变化,从而确定在低温(103k)相转变期间发生的结构特征。 结果表明,在氘代材料中,变化不是相变的本身,而是结构重组,其中氢键在相变温度下牢固地锁定,并在进一步冷却至4.2k时保持这种结构。 此外,区域100-290k中的轴向热膨胀系数中的差异和变化都可以通过涉及氢键和仲氢键的变化来解释。

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