Thermoelectric Properties of Magnesium-Doped Tetrahedrite Cu12-xMgxSb4S13

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermoelectric Properties of Magnesium-Doped Tetrahedrite Cu12-xMgxSb4S13

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Thermoelectric Properties of Magnesium-Doped Tetrahedrite Cu12-xMgxSb4S13

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/EF16_019%2F0000778" target="_blank" >EF16_019/0000778: Centrum pokročilých aplikovaných přírodních věd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Electronic Materials

ISSN

0361-5235

e-ISSN

1543-186X

Svazek periodika

48

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

6

Strana od-do

1926-1931

Kód UT WoS článku

000460453100020

EID výsledku v databázi Scopus

2-s2.0-85061608504