Chemical alloying and characterization of nanocrystalline bismuth telluride
2003 (English)In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 57, no 24-25, 3976-3982 p.Article in journal (Refereed) Published
A novel chemical alloying method has been developed for the fabrication of nanocrystalline thermoelectric alloy Bismuth telluride, Bi2Te3. The method consists of a combination of solution chemical method and thermal processing under controlled heating conditions. The components have been coprecipitated from a solution and the precursor consists of a solid solution of the different intermediate compounds and exhibits high reactivity. Calcination and hydrogen reduction of the precursor at moderate temperature, 350 degreesC, for 2 h resulted in the alloying of these elements to obtain the pure phase of the thermoelectric material in fine powder. The method is simpler than conventional melt processing and produced a 95-98% yield in laboratory scale. High concentration of grain boundaries provided by nanostructuring is expected to lower the thermal conductivity of thermoelectric material and further increase the performance.
Place, publisher, year, edition, pages
2003. Vol. 57, no 24-25, 3976-3982 p.
nanomaterials, powder technology, thermoelectric, Bi2Te3, coprecipitation, chemical alloying
IdentifiersURN: urn:nbn:se:kth:diva-22755DOI: 10.1016/s0167-577x(03)00250-7ISI: 000184846900047OAI: oai:DiVA.org:kth-22755DiVA: diva2:341453
QC 201005252010-08-102010-08-10Bibliographically approved