Nanostructuring as a tool to adjust thermal expansion in high ZT skutterudites

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F18%3A00494145" target="_blank" >RIV/68081723:_____/18:00494145 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.actamat.2017.12.001" target="_blank" >http://dx.doi.org/10.1016/j.actamat.2017.12.001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.actamat.2017.12.001" target="_blank" >10.1016/j.actamat.2017.12.001</a>

Result language

angličtina

Original language name

Nanostructuring as a tool to adjust thermal expansion in high ZT skutterudites

Original language description

Although filled skutterudites have a high figure of merit, ZT, it is still an aim to further improve their thermoelectric behavior. One successful route is to homogeneously disperse nanoparticles into the skutterudite matrix and thereby to reduce the lattice thermal conductivity without disturbing the electrical conductivity and the Seebeck coefficient. In this work Ta0.8Zr0.2B was dispersed into n-type (Mm,Sm)(y)Co4Sb12 powder by ball-milling or high energy ball-milling prior to hot-pressing. Structural and physical properties, covering also the low temperature range, were studied and compared with the recently investigated impact of nano Ta0.8Zr0.2B on p-type skutterudites. ZT was enhanced by 16%. nAs for thermoelectric applications good mechanical properties are important, we investigated the influence of Ta0.8Zr0.2B nanoparticles, added to (Mm,Sm)(y)Co4Sb12, on the hardness, elastic moduli and fracture toughness and found an enhancement of all three mechanical properties. It is well known that p-type skutterudites generally have a higher thermal expansion coefficient than their n-type counterpart. We show that dispersed borides in both n-type (Mm,Sm)(y)Co4Sb12 and p-type DD0.7Fe3CoSb12 can level out this discrepancy. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/GA17-12844S" target="_blank" >GA17-12844S: Thermal and phase stability of advanced thermoelectric materials</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Acta Materialia

ISSN

1359-6454

e-ISSN

—

Volume of the periodical

145

Issue of the periodical within the volume

FEB

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

359-368

UT code for WoS article

000424726200036

EID of the result in the Scopus database

2-s2.0-85039703773