Dislocation, annealing and quenching effects on the microindentation hardness of Bi2Te3 and Bi2Te2.9Se.1 single crystals |
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Authors: | Saji Augustine Elizabeth Mathai |
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Affiliation: | Crystal Growth Laboratory, Department of Physics, Cochin University of Science and Technology, Cochin 682 022, Kerala, India |
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Abstract: | Stoichiometric crystals of Bi2Te3 and Bi2Te2.9Se.1 have been grown from the melt by the horizontal zone melting (HZM) technique. X-ray powder diffraction and energy dispersive X-ray analysis could prove that the grown crystals are stoichiometric with lattice constants a=0.4374 nm, c=3.044 nm for Bi2Te3 and a=0.4374 nm, c=3.038 nm for Bi2Te2.9Se.1. Dislocation density measurements are carried out by etch pit technique and are observed by scanning electron and optical micrograph. The mechanical strength of the as-grown, quenched and annealed crystals is assessed by the Vickers hardness measurements. |
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Keywords: | Single crystal Bismuth telluride Horizontal zone melting Etching Microhardness |
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