序贯粉末x射线衍射观察低温或高压下NH4Cl的相变

IF 4.7 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

Inorganic Chemistry Pub Date : 2025-06-11 DOI:10.1021/acs.inorgchem.5c01358

Kazuki Komatsu, Takanori Murakami, Satoshi Nakano, Hiroyuki Kagi

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引用次数: 0

摘要

用x射线衍射研究了NH4Cl的压缩行为和相变。在0.7 ~ 1.0 GPa的明显体积异常证实了298 K时II-IV相转变的一级性质。室温下的低温x射线衍射测量显示，这种转变有轻微的滞后，这表明在冷却和加热过程中NH4+离子取向的有序程度存在差异。我们首先澄清了V相的晶体结构具有反铁有序取向，具有四方体系，并且V相的结构分析表明氢键在N-Cl距离交替变化中起关键作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

$Phase Transitions of NH4Cl under Low Temperature or High Pressure Observed by Sequential Powder X-ray Diffraction$

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Phase Transitions of NH4Cl under Low Temperature or High Pressure Observed by Sequential Powder X-ray Diffraction

The compression behavior and phase transitions of NH₄Cl were investigated by using X-ray diffraction. A clear volume anomaly at 0.7–1.0 GPa confirmed the first-order nature of the phase II–IV transition at 298 K. Low-temperature X-ray diffraction measurements at ambient pressure revealed a slight hysteresis in this transition, suggesting differences in the degree of order of the orientation of the NH₄⁺ ion in the cooling and heating processes. We first clarified that the crystal structure of phase V has antiferro-ordered orientation with a tetragonal system, and the structural analysis of phase V indicated that hydrogen bonding plays a key role in the alternately varied N–Cl distances.

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来源期刊

Inorganic Chemistry 化学-无机化学与核化学

CiteScore

7.60

自引率

13.00%

发文量

1960

审稿时长

1.9 months

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.