# Global softening to manipulate sound velocity for reliable high-performance MgAgSb thermoelectrics

https://mdr.nims.go.jp/datasets/8720ce7d-0377-4b66-a79e-f34596218a0b

## File

- [Energy & Environmental Science---Global softening to manipulate sound velocity for reliable high-performance MgAgSb thermoelectrics.pdf](https://mdr.nims.go.jp/filesets/8e2e962f-c932-4a3f-a382-f19d71ad6900/download) ([Detail](https://mdr.nims.go.jp/filesets/8e2e962f-c932-4a3f-a382-f19d71ad6900.md))

## Id

8720ce7d-0377-4b66-a79e-f34596218a0b

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-12-09T02:58:25.520865Z

## Updated at

2024-12-10T07:55:43.346450Z

## Published at

2024-12-10T07:55:43.405260Z

## Doi



## First published url

https://doi.org/10.1039/d4ee03521f

## Date published

2024-10-18

## Recorded date published

2024-11-12

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Global softening to manipulate sound velocity for reliable high-performance
    MgAgSb thermoelectrics
  title_type: original
  lang: en

## Description

- description: High-performance thermoelectric materials at room temperature are eagerly
    pursued due to their promising applications in the Internet of Things for sustainable
    power supply. Reducing sound velocity by softening chemical bonds is considered
    an effective approach to lowering thermal conductivity and enhancing thermoelectric
    performance. Here, different from softening chemical bonds at the atomic scale,
    we introduce a global softening strategy, which macroscopically softens the overall
    material to manipulate its sound velocity. This is demonstrated in MgAgSb, one
    of the most promising p-type thermoelectric materials at room temperature to replace
    (Bi,Sb)2Te3, that the addition of inherently soft organic compounds can easily
    lower its sound velocity, leading to an obvious reduction in lattice thermal conductivity.
    Despite a simultaneous reduction of the power factor, the overall thermoelectric
    quality factor B is enhanced, enabling softened MgAgSb by C18H36O2 addition to
    achieve a figure of merit zT value of ~ 0.88 at 300 K and a peak zT value of ~
    1.30. Consequently, an impressive average zT of ~ 1.17 over a wide temperature
    range has been realized. Moreover, this high-performance MgAgSb is verified to
    be highly repeatable and stable. With this MgAgSb, a decent conversion efficiency
    of 8.6% for a single thermoelectric leg and ~ 7% for a two-pair module have been
    achieved under a temperature difference of ~ 276 K, indicating its great potential
    for low-grade heat harvesting. This work will not only advance MgAgSb for low-grade
    power generation, but also inspire the development of high-performance thermoelectrics
    with global softening in the future.
  description_type: abstract
  lang: und

## Creator

- name: Airan Li
  role: author
  orcid: https://orcid.org/0009-0004-7318-4821
  organization: National Institute for Materials Science
- name: Longquan Wang
  role: author
  orcid: https://orcid.org/0009-0009-9910-9770
  organization: National Institute for Materials Science
- name: Jiankang Li
  role: author
  organization: National Institute for Materials Science
- name: Takao Mori
  role: author
  orcid: https://orcid.org/0000-0003-2682-1846
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: Royal Society of Chemistry (RSC)

## Managing organization



## Keyword

- subject: thermoelectric
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Energy & Environmental Science
  issn: '17545692'
  volume: '17'
  issue: '22'
  start_page: 8810
  end_page: 8819

## Conference



## Related item



## Funding

- identifier: JPMJMI19A1
  funder_name: JST-Mirai Program

## 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: 8e2e962f-c932-4a3f-a382-f19d71ad6900
  filename: Energy & Environmental Science---Global softening to manipulate sound
    velocity for reliable high-performance MgAgSb thermoelectrics.pdf
  content_type: application/pdf
  size: 2078220
  md5: d2f62403b0896d397e03dd19839e640d

## Thumbnail

fileset_id: 8e2e962f-c932-4a3f-a382-f19d71ad6900
filename: Energy & Environmental Science---Global softening to manipulate sound velocity
  for reliable high-performance MgAgSb thermoelectrics.pdf