# Phase Transitions of NH<sub>4</sub>Cl under Low Temperature or High Pressure Observed by Sequential Powder X-ray Diffraction

https://mdr.nims.go.jp/datasets/3d20b563-ef23-4016-a7a0-4966e0f2bea0

## File

- [Komatsu_NH4Cl_IC_v3.0.pdf](https://mdr.nims.go.jp/filesets/4e86c9b7-a4ba-4dd3-827c-f41b3f28bfd9/download) ([Detail](https://mdr.nims.go.jp/filesets/4e86c9b7-a4ba-4dd3-827c-f41b3f28bfd9.md))

## Id

3d20b563-ef23-4016-a7a0-4966e0f2bea0

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-06-27T01:59:20.950386Z

## Updated at

2025-06-27T04:19:09.660182Z

## Published at

2026-06-10T23:30:56.203078Z

## Doi

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

## First published url

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

## Date published

2025-06-23

## Recorded date published

2025-6-23

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Phase Transitions of NH<sub>4</sub>Cl under Low Temperature or High Pressure
    Observed by Sequential Powder X-ray Diffraction
  title_type: original
  lang: en

## Description

- description: 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.
  description_type: abstract
  lang: und

## Creator

- name: Kazuki Komatsu
  role: author
  orcid: https://orcid.org/0000-0003-3573-9174
- name: Takanori Murakami
  role: author
- name: Satoshi Nakano
  role: author
  orcid: https://orcid.org/0000-0002-7010-9867
- name: Hiroyuki Kagi
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: NH4Cl
  schema: not_defined
- subject: phase transition
  schema: not_defined
- subject: sequential powder x-ray diffraction
  schema: not_defined
- subject: high pressure
  schema: not_defined
- subject: low temperature
  schema: not_defined
- subject: antiferro-ordered orientation
  schema: not_defined

## Rights

- description: 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.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2025-06-11
end_date: 2026-06-11

## Journal

- title: Inorganic Chemistry
  issn: '00201669'
  volume: '64'
  issue: '24'
  start_page: 12079
  end_page: 12085

## Conference



## Related item



## Funding

- identifier: 18H01936
  funder_name: Japan Society for the Promotion of Science
- identifier: 21K18154
  funder_name: Japan Society for the Promotion of Science

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 4e86c9b7-a4ba-4dd3-827c-f41b3f28bfd9
  filename: Komatsu_NH4Cl_IC_v3.0.pdf
  content_type: application/pdf
  size: 3142501
  md5: 03cc44bcaf844640c43d0d919e1b6830

## Thumbnail

fileset_id: 4e86c9b7-a4ba-4dd3-827c-f41b3f28bfd9
filename: Komatsu_NH4Cl_IC_v3.0.pdf