# Magnetic Structures and Magnetic Phase Diagram of the Mixed-Valence Iron Phosphate Fe                    <sub>7</sub>                    (PO                    <sub>4</sub>                    )                    <sub>6</sub>

https://mdr.nims.go.jp/datasets/b7aa8342-7c69-48e6-9edd-6b6b6dd7e767

## File

- [InorgChem-V65-7418-Fe7(PO4)6.pdf](https://mdr.nims.go.jp/filesets/92eb110d-5c9f-43b7-9660-221576dd126e/download) ([Detail](https://mdr.nims.go.jp/filesets/92eb110d-5c9f-43b7-9660-221576dd126e.md))

## Id

b7aa8342-7c69-48e6-9edd-6b6b6dd7e767

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-04-16T06:10:12.314549Z

## Updated at

2026-04-16T07:02:35.474227Z

## Published at

2026-04-16T09:27:27.724138Z

## Doi



## First published url

https://doi.org/10.1021/acs.inorgchem.6c00534

## Date published

2026-04-06

## Recorded date published

2026-4-6

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: |-
    Magnetic Structures and Magnetic Phase Diagram of the Mixed-Valence Iron Phosphate Fe
                        <sub>7</sub>
                        (PO
                        <sub>4</sub>
                        )
                        <sub>6</sub>
  title_type: original
  lang: en

## Description

- description: Mixed-valence iron compounds are fascinating materials exemplified
    by ferrimagnetic Fe3O4, multiferroic LuFe2O4, and a pigment Fe4[Fe(CN)6]3. Mixed-valent
    iron (oxy)phosphates also provide a large variety of different connections between
    magnetic ions, which are responsible for complex magnetism. Fe7(PO4)6 (Fe32+Fe43+(PO4)6)
    has well-defined Fe2+ and Fe3+ sites and shows two antiferromagnetic transitions
    at TN1 = 47 K and TN2 = 16 K. Here, we investigated magnetic structures of Fe7(PO4)6
    (at zero magnetic field) using neutron powder diffraction and constructed a temperature–magnetic-field
    phase diagram. Below TN1, magnetic propagation vector is k1 = (1/2, 0, 1/2), and
    magnetic moments on Fe3+ sites are nearly fully ordered; while moments on Fe2+
    sites are significantly reduced. Below TN2, the second propagation vector appears
    k2 = (0, 1/2, 0) and co-exists with k1; moments on Fe2+ sites are fully ordered
    (at 2 K) reaching 4.5B suggesting noticeable spin-orbital contributions. Co-existence
    of two propagation vectors and triclinic symmetry result in variations of total
    magnetic moments on each site. Magnetic measurements up to 300 kOe detected one
    field-induced transition near 55.5 kOe. Data showed that TN1 is nearly magnetic-field
    independent up to 90 kOe, while a more complex behavior was observed near TN2
    at magnetic fields around 50 kOe.
  description_type: abstract
  lang: und

## Creator

- name: Andreas Dönni
  role: author
  orcid: https://orcid.org/0000-0002-7300-9175
  organization: National Institute for Materials Science
- name: Lukas Keller
  role: author
- name: Vladimir Y. Pomjakushin
  role: author
- name: Naohito Tsujii
  role: author
  orcid: https://orcid.org/0000-0002-6181-5911
  organization: National Institute for Materials Science
- name: Alexei A. Belik
  role: author
  orcid: https://orcid.org/0000-0001-9031-2355
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: magnetic structures
  schema: not_defined
- subject: magnetic phase diagram
  schema: not_defined
- subject: mixed valence
  schema: not_defined
- subject: iron phosphates
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2026-03-26

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Inorganic Chemistry
  issn: 1520510X
  volume: '65'
  issue: '13'
  start_page: 7418
  end_page: 7430

## Conference



## Related item



## Funding

- identifier: JP25K01657
  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: 92eb110d-5c9f-43b7-9660-221576dd126e
  filename: InorgChem-V65-7418-Fe7(PO4)6.pdf
  content_type: application/pdf
  size: 3231295
  md5: 76d773e9993efe3f750d7c29b8a15f86

## Thumbnail

fileset_id: 92eb110d-5c9f-43b7-9660-221576dd126e
filename: InorgChem-V65-7418-Fe7(PO4)6.pdf