# Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks

https://mdr.nims.go.jp/datasets/14a4793a-86f7-4e81-8a27-d2a48eee7181

## File

- [Nature Communications--Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with topological-insulating grain boundary networks.pdf](https://mdr.nims.go.jp/filesets/91b4399e-4042-4341-a0a2-0ee491d3a524/download) ([Detail](https://mdr.nims.go.jp/filesets/91b4399e-4042-4341-a0a2-0ee491d3a524.md))

## Id

14a4793a-86f7-4e81-8a27-d2a48eee7181

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-08T15:56:08.335402Z

## Updated at

2025-11-10T07:30:43.338996Z

## Published at

2025-11-10T07:25:02.497041Z

## Doi



## First published url

https://doi.org/10.1038/s41467-025-57250-6

## Date published

2025-03-26

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Decoupled charge and heat transport in Fe2VAl composite thermoelectrics with
    topological-insulating grain boundary networks
  title_type: original
  lang: en

## Description

- description: "Decoupling charge and heat transport is essential for optimizing thermoelectric
    materials. Strategies to inhibit lattice-driven heat transport, however, also
    compromise carrier mobility, limiting the performance of most thermoelectrics,
    including Fe2VAl Heusler compounds. Here, we demonstrate an innovative approach,
    which bypasses this tradeoff: via liquid-phase sintering, we incorporate the archetypal
    topological insulator Bi1 – xSbx between Fe2V0.95Ta0.1Al0.95 grains. Structural
    investigations alongside extensive thermoelectric and magneto-transport measurements
    reveal distinct modifications in the microstructure, a reduced lattice thermal
    conductivity and a simultaneously enhanced carrier mobility arising from topologically
    protected charge\r\ntransport along the grain boundaries. This yields a huge performance
    boost, resulting in one of the highest figure of merits among both half- and full-Heusler
    compounds, z ≈ 1.6 × 10−3 K−1 (zT ≈ 0.5) at 295 K. Our findings highlight the
    potential of topological-insulating secondary phases to decouple charge and heat
    transport and call for more advanced theoretical studies of multiphase composites."
  description_type: abstract
  lang: und

## Creator

- name: Fabian Garmroudi
  role: author
- name: Illia Serhiienko
  role: author
  orcid: https://orcid.org/0000-0002-3072-9412
  organization: National Institute for Materials Science
- name: Michael Parzer
  role: author
- name: Sanyukta Ghosh
  role: author
- name: Pawel Ziolkowski
  role: author
- name: Gregor Oppitz
  role: author
- name: Hieu Duy Nguyen
  role: author
- name: Cédric Bourgès
  role: author
  orcid: https://orcid.org/0000-0001-9056-0420
  organization: National Institute for Materials Science
- name: Yuya Hattori
  role: author
  orcid: https://orcid.org/0000-0002-3805-4659
  organization: National Institute for Materials Science
- name: Alexander Riss
  role: author
- name: Sebastian Steyrer
  role: author
- name: Gerda Rogl
  role: author
- name: Peter Rogl
  role: author
- name: Erhard Schafler
  role: author
- name: Naoyuki Kawamoto
  role: author
  orcid: https://orcid.org/0000-0002-2022-3987
  organization: National Institute for Materials Science
- name: Eckhard Müller
  role: author
- name: Ernst Bauer
  role: author
- name: Johannes de Boor
  role: author
- name: Takao Mori
  role: author
  orcid: https://orcid.org/0000-0003-2682-1846
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: thermoelectric
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nature Communications
  issn: '20411723'
  volume: '16'
  issue: '1'
  article_number: '2976'

## Conference



## Related item



## Funding

- identifier: JPMJMI19A1
  funder_name: MEXT | Japan Science and Technology Agency
- funder_name: Lions Clubs International Foundation
- funder_name: Lions Club Wien St. Stephan
- identifier: '520487260'
  funder_name: Deutsche Forschungsgemeinschaft

## 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



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## Fileset

- id: 91b4399e-4042-4341-a0a2-0ee491d3a524
  filename: Nature Communications--Decoupled charge and heat transport in Fe2VAl composite
    thermoelectrics with topological-insulating grain boundary networks.pdf
  content_type: application/pdf
  size: 3638628
  md5: bc0e876117420e828b43a0603f324223

## Thumbnail

fileset_id: 91b4399e-4042-4341-a0a2-0ee491d3a524
filename: Nature Communications--Decoupled charge and heat transport in Fe2VAl composite
  thermoelectrics with topological-insulating grain boundary networks.pdf