Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

First-principles calculations of the phonon, mechanical and Thermoelectric properties of half-Heusler alloy VIrSi alloys

Paul O. Adebambo
* ORCID logo ,
Bamidele I. Adetunji
,
Oghenekevwe T. Uto
ORCID logo ,
Stephane Kenmoe
* ,
Gboyega A. Adebayo
*
Version 1 : Received: 21 November 2022 / Approved: 22 November 2022 / Online: 22 November 2022 (07:12:14 CET)

A peer-reviewed article of this Preprint also exists.

Adebambo, P.O.; Adetunji, B.I.; Uto, O.T.; Kenmoe, S.; Adebayo, G.A. First-Principles Calculations of the Phonon, Mechanical and Thermoelectric Properties of Half-Heusler Alloy VIrSi Alloys. Crystals 2022, 12, 1838. Adebambo, P.O.; Adetunji, B.I.; Uto, O.T.; Kenmoe, S.; Adebayo, G.A. First-Principles Calculations of the Phonon, Mechanical and Thermoelectric Properties of Half-Heusler Alloy VIrSi Alloys. Crystals 2022, 12, 1838.

Abstract

The density functional theory was used to explore the structural, electronic, dynamical, and thermoelectric properties of a VIrSi Half-Heulser (HH) alloy. The minimum lattice constant of 5.69 ( ̊A) was obtained for VIrSi alloy. Besides, the band structure and the projected density of states for this HH alloy were calculated, and the gap between the valence and conduction bands was noted to be 0.2 eV. Also, the quasi-harmonic approximation was used to predict the dynamical stability of the VIrSi HH alloy. At 300 K, the Seebeck Coefficient of 370 and -270 μV.K−1., respectively, was achieved for the p and n-type doping. From the power factor result, the highest peak of 18 X 1011W/cm.K2 is obtained in the n-type doping. The Figure of Merit (ZT) result revealed that VIrSi alloy possesses a high ZT at room temperature, which would make VIrSi alloy applicable for thermoelectric performance.

Keywords

Phonon dispersion; PDOS; Mechanical properties; Power factor and Figure of Merit

Subject

Physical Sciences, Condensed Matter Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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