Thermoelectric Properties of Magnesium-Doped Tetrahedrite Cu12-xMgxSb4S13
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F19%3A00328418" target="_blank" >RIV/68407700:21340/19:00328418 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s11664-019-07032-w" target="_blank" >https://doi.org/10.1007/s11664-019-07032-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11664-019-07032-w" target="_blank" >10.1007/s11664-019-07032-w</a>
Alternative languages
Result language
angličtina
Original language name
Thermoelectric Properties of Magnesium-Doped Tetrahedrite Cu12-xMgxSb4S13
Original language description
Tetrahedrites, naturally occurring sulfosalt minerals, have been shown to exhibit peak ZT values close to unity near 700 K due to the combination of semiconducting-like properties and extremely low lattice thermal conductivity. A wide range of elements can be substituted into tetrahedrites, each of them affecting the thermoelectric properties. Interestingly, all tetrahedrites reported to date contain exclusively d- and p-block elements of the periodic table. Here, we demonstrate that magnesium, an s-block element, can be introduced in Cu12Sb4S13. We successfully prepared a series of polycrystalline samples Cu12-xMgxSb4S13 with nominal compositions x = 0.5, 1.0, 1.5. Powder X-ray diffraction and chemical mapping confirmed that approximately half of the Mg atoms were incorporated into the tetrahedrite unit cell, while the other half forms electrically insulating MgS precipitates. Thermoelectric properties, measured between 5 and 673 K, show that the effect of Mg2+ is similar to that of other aliovalent elements substituting for either Cu or Sb. In particular, increasing the Mg content drives the system closer to a semiconducting behavior, leading to a concomitant increase in the thermopower and electrical resistivity and a decrease in the electronic part of the thermal conductivity. Because these two trends counterbalance each other, the overall effect of Mg on the ZT of Cu12Sb4S13 is found to be marginal with a peak ZT of 0.55 at 673 K.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - 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.)
Result continuities
Project
<a href="/en/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Center for advanced applied science</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Electronic Materials
ISSN
0361-5235
e-ISSN
1543-186X
Volume of the periodical
48
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
1926-1931
UT code for WoS article
000460453100020
EID of the result in the Scopus database
2-s2.0-85061608504