# Thermoelectric properties of semiconducting approximant crystals in the Al–Ge–Ru system

https://mdr.nims.go.jp/datasets/8cdb6d9d-3420-4078-b432-01f70a84cec5

## File

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## Id

8cdb6d9d-3420-4078-b432-01f70a84cec5

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-25T04:57:59.744609Z

## Updated at

2025-11-25T07:30:03.713280Z

## Published at

2025-11-25T07:24:30.489802Z

## Doi



## First published url

https://doi.org/10.1016/j.scriptamat.2025.117100

## Date published

2025-11-20

## Recorded date published

2026-3

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Thermoelectric properties of semiconducting approximant crystals in the Al–Ge–Ru
    system
  title_type: original
  lang: en

## Description

- description: Semiconducting quasicrystals and their approximant crystals (ACs) have
    attracted significant attention because of their potential applications as thermoelectric
    materials. Herein, we report the synthesis of a semiconducting AC in the Al–Ge–Ru
    system and its thermoelectric properties. The Al–Ge–Ru AC exhibited a band gap
    of approximately 0.25 eV. Notably, we observed a negative Seebeck coefficient,
    which reached a maximum magnitude of 200 µV K−1, marking the first example of
    an n-type semiconducting AC. The Al74Ge4Ru22 AC exhibiting degenerate semiconductor
    behavior reached a dimensionless figure of merit of 0.28 at a peak temperature
    of 473 K. This represents the highest figure of merit achieved to date for a quasicrystalline-based
    thermoelectric material.
  description_type: abstract
  lang: und

## Creator

- name: Yutaka Iwasaki
  role: author
  orcid: https://orcid.org/0000-0002-7317-4939
- name: Yasuhiro Niwa
  role: author
- name: Koichi Kitahara
  role: author
  orcid: https://orcid.org/0009-0007-4557-4816
- name: Kaoru Kimura
  role: author
- name: Ryuji Tamura
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: Quasicrystal
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Scripta Materialia
  issn: '13596462'
  volume: '273'
  article_number: '117100'

## Conference



## Related item



## Funding

- funder_name: Japan Science and Technology Agency
- identifier: JP23K26367
  funder_name: Japan Society for the Promotion of Science
- identifier: JP19H05818
  funder_name: Japan Society for the Promotion of Science
- identifier: JP23H01673
  funder_name: Japan Society for the Promotion of Science
- identifier: JP19H05817
  funder_name: Japan Society for the Promotion of Science
- identifier: JP19K15274
  funder_name: Japan Society for the Promotion of Science
- identifier: JP24K17495
  funder_name: Japan Society for the Promotion of Science
- identifier: JPMJCR22O3
  funder_name: Core Research for Evolutional Science and Technology

## 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: 1122718d-72c9-4932-9d9e-30b54d19eea8
  filename: 1-s2.0-S1359646225005615-main.pdf
  content_type: application/pdf
  size: 1589693
  md5: 031ab44eeb5d8f0c46ba00b05efef104

## Thumbnail

fileset_id: 1122718d-72c9-4932-9d9e-30b54d19eea8
filename: 1-s2.0-S1359646225005615-main.pdf