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The compression behavior and phase transitions of NH₄Cl were investigated 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 orderness of the orientation of NH₄⁺ ion in the cooling and heating processes. We first clarified that the crystal structure of phase V has antiferro-ordered orientation with tetragonal system, and the structural analysis of phase V indicated that hydrogen bonding plays a key role in the alternately varied N-Cl distances.

権利情報:

• In Copyright
  

  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © 2025 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.5c01358.

キーワード: NH4Cl, phase transition, sequential powder x-ray diffraction, high pressure, low temperature, antiferro-ordered orientation

刊行年月日: 2025-06-23

出版者: American Chemical Society (ACS)

掲載誌:

• Inorganic Chemistry (ISSN: 00201669) vol. 64 issue. 24 p. 12079-12085

研究助成金:

• Japan Society for the Promotion of Science 18H01936
• Japan Society for the Promotion of Science 21K18154

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5550

公開URL: https://doi.org/10.1021/acs.inorgchem.5c01358

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更新時刻: 2025-06-27 13:19:09 +0900

MDRでの公開時刻: 2026-06-11 08:30:56 +0900