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AuthorLemine, Aicha S.,
AuthorFayyaz, Osama
AuthorShakoor, R.A.
AuthorAhmad, Zubair
AuthorBhadra, Jolly
AuthorAl-Thani, Noora J.
Available date2023-01-11T06:07:31Z
Publication Date2023-04-05
Publication NameJournal of Alloys and Compounds
Identifierhttp://dx.doi.org/10.1016/j.jallcom.2023.168763
CitationLemine, A. S., Fayyaz, O., Shakoor, R. A., Ahmad, Z., Bhadra, J., & Al-Thani, N. J. (2023). Effect of Cold and Hot Compactions on Corrosion behavior of p-and n-type Bismuth Telluride-based Alloys developed through Microwave Sintering Process. Journal of Alloys and Compounds, 168763.
ISSN09258388
URIhttps://www.sciencedirect.com/science/article/pii/S092583882300066X
URIhttp://hdl.handle.net/10576/38309
AbstractBismuth Telluride (BiTe) based p-type and n-type alloys exhibit superior thermoelectric (TE) performance covering energy requirements for specialized and home utilization. The main challenge nowadays is the sustainability of their adequate TE performance in corrosive environments, which might activate the corrosion reactions, leading to the degradation of p/n semiconductors, and then failure of the TE device. This study investigates the electrochemical responses of cold and hot compacted, microwave-sintered p- and n-type BiTe alloys in a saline medium (3.5 wt% NaCl solution). XRD analysis of microwave-sintered cold- and hot-compacted BiTe pellets confirmed their phase purity and uniform crystal structure. Potentiodynamic polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS) data showed enhancements in the corrosion behavior of hot-compacted p-type and cold-compacted n-type BiTe pellets. The study also proposes a corrosion resistance mechanism with an equivalent electrical circuit (EEC) to fit the experimental EIS data of both BiTe pellets. FE-SEM analysis showed visible microstructural evolutions of the BiTe pellets and their passive films. It revealed a remarkable improvement in the microstructure and blocking effect caused by the formed passive films coating the surfaces of the pellets and acting as a physical barrier preventing the passing of destructive Cl- ions. EDX spectra have proved the presence of p-type and n-type BiTe alloys, each with the corresponding dopant element of Antimony (Sb) or Selenium (Se), respectively, and in the same weight compositions for either hot or cold compacted pellets. AFM analysis examined the surface topography of developed pellets. It showed an increment in the surface roughness-mean-square (RMS) values with the development of passive films on p- and n-type BiTe alloys.
SponsorThis work was supported by Qatar University Grant no. GTRA-17722. The statements made herein are solely the responsibility of the authors. The authors would like to acknowledge the technical support from the Central Lab Unit (CLU) and the Center of Advanced Materials (CAM) at Qatar University. Open Access funding is provided by the Qatar National Library.
Languageen
PublisherElsevier
SubjectCorrosion behavior
Passive film
Bismuth telluride
Thermoelectric
Microwave sintering
TitleEffect of cold and hot compactions on corrosion behavior of p- and n-type bismuth telluride-based alloys developed through microwave sintering process
TypeArticle
Volume Number939
Open Access user License http://creativecommons.org/licenses/by/4.0/
ESSN1873-4669
dc.accessType Full Text


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