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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.

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  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.

Keyword: NH4Cl, phase transition, sequential powder x-ray diffraction, high pressure, low temperature, antiferro-ordered orientation

Date published: 2025-06-23

Publisher: American Chemical Society (ACS)

Journal:

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

Funding:

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

Manuscript type: Author's version (Accepted manuscript)

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

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

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Updated at: 2025-06-27 13:19:09 +0900

Published on MDR: 2026-06-11 08:30:56 +0900