Document Details

Document Type : Thesis 
Document Title :
THERMOELECTRIC PROPERTIES OF COBALT TRIANTIMONIDE
الخصائص الكهروحرارية لثلاثي أنتيمونيد الكوبالت
 
Subject : faculty of science 
Document Language : Arabic 
Abstract : The rapid increase in the global energy consumption and our dependence on the depleting and environmentally hazardous fossil fuel raise the need to find green and sustainable energy resources. Thermoelectric power generation is one of the possible solutions for the global energy problem. In this work, a theoretical study of thermoelectric transport coefficients of a promising thermoelectric material, cobalt triantimonide, has been presented. Lattice thermal conductivity of CoSb3 was theoretically calculated for four samples, which were experimentally prepared and studied by different research groups under different conditions, using a systematic and rigorous approach. Calculations were carried out over a wide temperature range by applying Callaway’s model, which involves calculating the relaxation time of phonons due to different scattering processes while taking into consideration the role of N-processes. In addition, Srivastava’s rigorous scheme was utilised to calculate the relaxation time of phonons due to three-phonon scattering. A very good agreement between the theoretically obtained results and the experimentally reported data is shown. Moreover, the contributions of each scattering process towards lattice thermal resistivity have been quantitatively analysed and presented. Furthermore, both the contribution of the N-drift term in Callaway’s model towards thermal conductivity and the mode-average phonon mean-free path have been calculated over the entire temperature range. Finally, the temperature variation of the Fermi energy for a sample has been theoretically calculated and used to calculate the temperature variation of the Seebeck coefficient for the same sample. Electronic properties have been evaluated considering the scattering parameter to be constant, then re-evaluated considering the scattering parameter to be adjustable. The later calculations showed better agreement with experimental results. 
Supervisor : Dr. Abdullah Al-Sheikhi 
Thesis Type : Master Thesis 
Publishing Year : 1441 AH
2020 AD 
Added Date : Wednesday, March 11, 2020 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
هلا مرعي ابوشحادهAboushehada, Hala MarreiResearcherMaster 

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 46049.pdf pdf 

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