Propiedades mecánicas del telururo de bismuto (Bi2Te3) procesado mediante torsión bajo alta presión (HPT)
- Jon Ander Santamaría
- Jon Alkorta
- Javier Gil Sevillano
ISSN: 0366-3175
Any de publicació: 2013
Volum: 52
Número: 3
Pàgines: 137-142
Tipus: Article
Altres publicacions en: Boletín de la Sociedad Española de Cerámica y Vidrio
Objectius de Desenvolupament Sostenible
Resum
Bismuth telluride, Bi2Te3, is the main thermoelectric material currently in use for commercial cooling devices or for energy harvesting near room temperature. Because of its highly anisotropic layered structure, Bi2Te3 is very brittle, failing by cleavage along its basal plane. Refining its grain size is expected to increase its toughness with the advantage that, simultaneously, its thermoelectric “figure of merit” results increased. In this work, powders of the compound have been compacted by conventional methods as well as by severe plastic deformation under high pressure (3 GPa) using high pressure torsion (HPT, one turn at room temperature). Near-theoretical density has been achieved. The hardness and toughness of the compacts have been assessed by micro and nano-indentation.