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AuthorEl‑Makaty, Farah M.
AuthorPothuvattil, Nandagopal S.
AuthorHamouda, Abdelmagid
AuthorYoussef, Khaled M.
Available date2023-09-29T07:07:15Z
Publication Date2022-10-13
CitationEl-Makaty, F. M., Pothuvattil, N. S., Hamouda, A., & Youssef, K. M. (2022). The effect of graphene on the activation energy of grain growth for the nanocrystalline thermoelectric n-type Bi2Te2. 7Se0. 3. Emergent Materials, 5(6), 1871-1880.
ISSN2522-5731
URIhttp://hdl.handle.net/10576/48119
AbstractEven though bismuth telluride is frequently produced by mechanical alloying for thermoelectric materials, no data has been published addressing the thermal behavior and activation energy of the milled n-type Bi2Te2.7Se0.3 powders. This paper studies the activation energy of grain growth for the nanocrystalline n-type Bi2Te2.7Se0.3 and two graphene-Bi2Te2.7Se0.3 composites with diferent graphene concentrations (0.05 and 0.5 wt.%). Grain size and structural analyses of these samples have been carried out using X-ray difraction (XRD) and transmission electron microscopy (TEM). The thermal stability of the three samples is investigated by incorporating diferential scanning calorimetry data with the Kissinger model. The activation energy of the pristine Bi2Te2.7Se0.3 alloy is found to be 268 kJ/mol. For the composite samples, a lower graphene weight percentage (0.05 wt.%) increased the activation energy to 270 kJ/mol. In contrast, higher amounts of graphene (0.5 wt.%) reduced the activation energy signifcantly to 254 kJ/mol. The observed efect is found to be directly related to graphene’s exfoliation in the bismuth telluride matrix. These results ofer a better understanding of the thermal behavior of the nanocrystalline pristine n-type Bi2Te2.7Se0.3 and the infuence of graphene nanofller on the thermal stability of the bismuth telluride nanocomposites.
SponsorOpen Access funding provided by the Qatar National Library. This work was supported by Grant no. NPRP10–0206–170366 and GSRA8-L-1–0414-21013 from Qatar National Research Fund (a member of the Qatar Foundation).
Languageen
SubjectActivation energy
Grain growth
Mechanical milling
Bismuth telluride
Graphene
TitleThe effect of graphene on the activation energy of grain growth for the nanocrystalline thermoelectric n‑type Bi2Te2.7Se0.3
TypeArticle
Pagination1871-1880
Issue Number6
Volume Number5
ESSN2522-574X
dc.accessType Open Access


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