# Giant magnetocaloric effect of divalent europium-based oxide composites of Eu2TiO4 and Eu3Ti2O7 for cryogenic temperature magnetic refrigeration

https://mdr.nims.go.jp/datasets/9b1ee698-db3c-41be-b5e7-593b5450b60f

## File

- [Matsumoto_EuTiO_JAP_138_2025_p033901.pdf](https://mdr.nims.go.jp/filesets/cd059aeb-d824-4592-b40b-4c5a36fed65f/download) ([Detail](https://mdr.nims.go.jp/filesets/cd059aeb-d824-4592-b40b-4c5a36fed65f.md))

## Id

9b1ee698-db3c-41be-b5e7-593b5450b60f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-08-18T09:59:31.305613Z

## Updated at

2025-08-19T07:30:28.734149Z

## Published at

2025-08-19T07:19:48.016396Z

## Doi



## First published url

https://doi.org/10.1063/5.0278479

## Date published

2025-07-21

## Recorded date published

2025-7-21

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Giant magnetocaloric effect of divalent europium-based oxide composites of
    Eu2TiO4 and Eu3Ti2O7 for cryogenic temperature magnetic refrigeration
  title_type: original
  lang: en

## Description

- description: For cryogenic temperature magnetic refrigeration, we focused on materials
    containing Eu2+ ions and synthesized sintered composite materials comprising Eu2TiO4
    and Eu3Ti2O7. Eu3Ti2O7 and Eu2TiO4 exhibited second-order phase transitions between
    the paramagnetic and ferromagnetic states at 7 K and 8 K, respectively. The magnetocaloric
    effect was evaluated from the magnetization and specific heat. It was shown that
    Eu2+ ions behave similarly to free ions with J=7/2. The maximum magnetic entropy
    change per unit volume exceeded 0.3 J/cm3K at a magnetic field of 5 T. The Carnot
    cycle at the hydrogen liquefaction temperature was evaluated using the obtained
    entropy temperature diagram. It was found that the cooling capacity is several
    times higher than that of known materials such as GGG, DGAG and GTP. It was also
    shown that the present composite materials are useful for extending the operating
    temperature range of the adiabatic demagnetization refrigerator (ADR). These results
    indicate that Eu2TiO4 and Eu3Ti2O7 composites are promising magnetic refrigerants
    for cryogenic magnetic refrigeration.
  description_type: abstract
  lang: und

## Creator

- name: Koichi Matsumoto
  role: author
  orcid: https://orcid.org/0000-0003-1141-5239
- name: Masaki Horie
  role: author
- name: Hironori Hasegawa
  role: author
- name: Kazuhiro Ishikawa
  role: author
- name: Shuhei Yamazaki
  role: author
- name: Hideaki Kitazawa
  role: author
  orcid: https://orcid.org/0000-0002-9756-2311
- name: Akiko T. Saito
  role: author
  orcid: https://orcid.org/0000-0001-5920-5965
- name: Takenori Numazawa
  role: author
  orcid: https://orcid.org/0000-0003-1828-4972

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: Magnetocaloric refrigeration
  schema: not_defined
- subject: Magnetocaloric effect
  schema: not_defined
- subject: Ferromagnetism
  schema: not_defined
- subject: Phase transitions
  schema: not_defined
- subject: Cooling capacity
  schema: not_defined
- subject: Composite materials
  schema: not_defined
- subject: Ceramics
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Journal of Applied Physics
  issn: '00218979'
  volume: '138'
  issue: '3'
  article_number: '033901'

## Conference



## Related item



## Funding

- identifier: JPMJMI18A3
  funder_name: Japan Science and Technology Agency

## 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: cd059aeb-d824-4592-b40b-4c5a36fed65f
  filename: Matsumoto_EuTiO_JAP_138_2025_p033901.pdf
  content_type: application/pdf
  size: 3036859
  md5: 831c402fb9c497054889eb65fdc3c113

## Thumbnail

fileset_id: cd059aeb-d824-4592-b40b-4c5a36fed65f
filename: Matsumoto_EuTiO_JAP_138_2025_p033901.pdf