Date of Graduation

5-2023

Document Type

Thesis

Degree Name

Master of Science in Microelectronics-Photonics (MS)

Degree Level

Graduate

Department

Microelectronics-Photonics

Advisor/Mentor

Manasreh, Bothina H.

Committee Member

Manasreh, Omar O.

Second Committee Member

Churchill, Hugh O.H.

Keywords

Lattice thermal conductivity; Magnetic properties; Quaternary Heusler alloy; Thermoelectric properties

Abstract

Density functional theory calculations are performed to investigate the electrical electronic, magnetic, and thermoelectric properties of CrTiRhAl quaternary Heusler alloy (QHA). The type-I atomic configuration is found to be the most stable structure of this alloy. The CrTiRhAl QHA exhibits a half-metallic ferromagnetic structure with a narrow band gap at one spin channel (semiconductor), and a metallic behavior at the other spin channel. This corresponds to a 100% spin-polarization, making it ideal for potential spintronic applications. Applying the semi-classical Boltzmann theory, the Seebeck coefficient, electrical conductivity, and electronic thermal conductivity of CrTiRhAl alloy were calculated. The predicted figure of merit (ZT) was found to be low (0.4 at 300K), which is not promising for thermoelectric applications. Keywords: Quaternary Heusler alloy, magnetic properties, lattice thermal conductivity, thermoelectric properties.

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