Raman & infrared study of Bi filled Co4Sb12

Raut, Krushna Kumari; Bali, Ashoka; Mallik, Ramesh Chandra
June 2012
AIP Conference Proceedings;6/5/2012, Vol. 1447 Issue 1, p855
Academic Journal
CoSb3 skutterudites are established thermoelectric materials in the 500-800K temperature range. Undoped and Bi filled CoSb3 samples were synthesized by induction melting-annealing process and phase confirmation done by X-Ray diffraction. The role of bismuth as a filler in CoSb3 was investigated by Raman and far infrared reflectance study. It was found that bismuth strengthens Sb vibrations, and can potentially scatter Sb related acoustic phonons effectively. As a result substantial reduction in thermal conductivity may be possible with proper control of Bi filling.


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