Stoichiometric and off-stoichiometric full Hensler Fe2V1-xWxAl thermoelectric systems

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU137459" target="_blank" >RIV/00216305:26620/20:PU137459 - isvavai.cz</a>

Výsledek na webu

<a href="https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.075117" target="_blank" >https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.075117</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.102.075117" target="_blank" >10.1103/PhysRevB.102.075117</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stoichiometric and off-stoichiometric full Hensler Fe2V1-xWxAl thermoelectric systems

Popis výsledku v původním jazyce

A series of full Heusler alloys, Fe2V1-xWxAl, 0 <= x <= 0.2, was prepared and characterized, and relevant physical properties to account for the thermoelectric performance were studied in a wide temperature range. Additionally, off-stoichiometric samples with similar compositions have been included, and a 10% improvement of the thermoelectric figure of merit was obtained. The V/W substitution causes (i) a change of the main carrier type, from holes to electrons as evidenced from Seebeck and Hall measurements, and (ii) a substantial reduction of the lattice thermal conductivity due to a creation of lattice disorder by means of a distinct different mass and metallic radius upon the V/W substitution. Moreover ZT values above 0.2 have been obtained. A microscopic understanding of the experimental data observed is revealed from ab initio calculations of the electronic and phononic structure. This series of alloys constitutes the basis for thin film systems, which have recently been found to exhibit ZT values beyond those reported so far in the literature.

Název v anglickém jazyce

Stoichiometric and off-stoichiometric full Hensler Fe2V1-xWxAl thermoelectric systems

Popis výsledku anglicky

A series of full Heusler alloys, Fe2V1-xWxAl, 0 <= x <= 0.2, was prepared and characterized, and relevant physical properties to account for the thermoelectric performance were studied in a wide temperature range. Additionally, off-stoichiometric samples with similar compositions have been included, and a 10% improvement of the thermoelectric figure of merit was obtained. The V/W substitution causes (i) a change of the main carrier type, from holes to electrons as evidenced from Seebeck and Hall measurements, and (ii) a substantial reduction of the lattice thermal conductivity due to a creation of lattice disorder by means of a distinct different mass and metallic radius upon the V/W substitution. Moreover ZT values above 0.2 have been obtained. A microscopic understanding of the experimental data observed is revealed from ab initio calculations of the electronic and phononic structure. This series of alloys constitutes the basis for thin film systems, which have recently been found to exhibit ZT values beyond those reported so far in the literature.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

PHYSICAL REVIEW B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

102

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

„075117-1“-„075117-11“

Kód UT WoS článku

000558965800003

EID výsledku v databázi Scopus

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