Journal
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY
Volume 131, Issue 1-3, Pages 54-61Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.mseb.2006.03.029
Keywords
tellurium; vacuum distillation; zone refining; segregation; impurities
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Vacuum distillation and zone melting purification processes of tellurium were studied. Results were obtained by atomic absorption spectroscopy with graphite furnace (AASGF). Concentrations of impurities such as Al, Ag, As, Ca, Cu Fe, In, Mg, Mn, Na, Pb, Se, Pd, and V were successfully decreased. We confirmed that the ultimate distribution of impurities was reached. A series of segregation coefficients was determined by fitting the experimental measurements of concentrations with Pfann's model plots. The majority of segregation coefficient values were less than 1. The segregation process and diffusion coefficients were affected by the atomic dimensions of impurities. Global characterization of the grown tellurium purity was achieved by electrical measurement on samples of tellurium at liquid helium temperature. We observed an increase of the electric mobility as well as a decrease in the number of carriers. (c) 2006 Elsevier B.V All rights reserved.
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