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Structure and carrier transport properties of hot‐press deformed Bi 0.5 Sb 1.5 Te 3
Author(s) -
Kitagawa Hiroyuki,
Kurata Akira,
Araki Hiroshi,
Morito Shigekazu,
Tanabe Eishi
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925133
Subject(s) - electron backscatter diffraction , materials science , diffraction , deformation (meteorology) , extrusion , graphite , thermoelectric effect , pressing , hot pressing , hexagonal crystal system , composite material , hall effect , electrical resistivity and conductivity , crystallography , optics , microstructure , chemistry , electrical engineering , thermodynamics , physics , engineering
A hot‐press deformation study of Bi 0.5 Sb 1.5 Te 3 was undertaken to obtain polycrystals with a preferred textural orientation for use in thermoelectric applications. Source materials were prepared by mechanical alloying (MA) as well as hot pressing (HP) and they were deformed at 673–823 K by applying mechanical pressure in a graphite die. The materials were extruded in a direction opposite to the direction of the applied pressure. X‐ray diffraction (XRD) and electron backscattered diffraction (EBSD) analyses indicated that the hexagonal c ‐planes of the samples that were deformed at high temperatures preferably aligned along the direction of the extrusion. The Hall mobility increased as the deformation temperature increased and it showed a good correlation to the textural orientation.