Properties of HPT-Processed Large Bulks of p‑Type SkutteruditenDD0.7Fe3CoSb12 with ZT > 1.3

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081723%3A_____%2F21%3A00542769" target="_blank" >RIV/68081723:_____/21:00542769 - isvavai.cz</a>

Result on the web

<a href="https://pubs.acs.org/doi/10.1021/acsaem.1c00409" target="_blank" >https://pubs.acs.org/doi/10.1021/acsaem.1c00409</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acsaem.1c00409" target="_blank" >10.1021/acsaem.1c00409</a>

Result language

angličtina

Original language name

Properties of HPT-Processed Large Bulks of p‑Type SkutteruditenDD0.7Fe3CoSb12 with ZT > 1.3

Original language description

The influence of shear strain on the microstructural, physical, and mechanical properties was studied on large bulk samples (diameter: 30 mm, thickness: 1 or 8 mm), which were consolidated by high-pressure torsion (HPT) from a commercial powder DD0.7Fe3CoSb12. Particularly, the thick sample (mass ∼ 53 g) allowed measuring the thermoelectric (TE) properties with respect to various orientations of the specimen in the sample. All data were compared with those of a hot-pressed (HP) reference sample, prepared with the same powder. Transmission electron microscopy, as well as X-ray powder diffraction profile analyses, Hall measurements, and positron annihilation spectroscopy, supported these investigations. Furthermore, synchrotron data for the temperature range from 300 to 825 K were used to evaluate the changes in the grain size and dislocation density as well as the thermal expansion coefficient via the change in the lattice parameter during heating. In addition, hardness and direct thermal expansion measurements of the HPT samples were performed and compared with the HP reference sample’s values. With the increase of the shear strain from the center to the rim of the sample, the electrical resistivity becomes higher, whereas the thermal conductivity becomes lower, but the Seebeck coefficient remained almost unchanged. For the thin as well as thick samples, the enhanced electrical resistivity was balanced out by a decreased thermal conductivity such that the maximum ZT values (ZT = 1.3–1.35 at 856 K) do not vary much as a function of the shear strain throughout the sample, however, all ZTs are higher than that of the HP sample. The thermal–electric conversion efficiencies are in the range of 14–15% (for 423–823 K). With similar high ZT values for the n-type skutterudites, fabricated in the same fast and sustainable way, these p- and n-type skutterudites may serve as legs for TE generators, directly cut from the big HPT bulks.n

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

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OECD FORD branch

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

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

ACS Applied Energy Materials

ISSN

2574-0962

e-ISSN

—

Volume of the periodical

4

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

4831-4844

UT code for WoS article

000656119600057

EID of the result in the Scopus database

2-s2.0-85106416794