Profiling of selenium removal in hydrogen ambient zone-refined tellurium bar using RF-GDOES

Ultrapure tellurium (Te) metal has become an important metal in the strategic sector for fabricating high performance infrared devices for thermal imaging and night vision cameras. Zone refining (ZR) is a proven technique for purification of Te. Selenium (Se), present as an impurity in Te, is not ea...

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Bibliographic Details
Published in:Materials characterization 2007-01, Vol.58 (1), p.92-95
Main Authors: Anil, G., Reddy, M.R.P., Prasad, D.S., Ali, S.T., Munirathnam, N.R., Prakash, T.L.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
GLOW DISCHARGES
HYDROGEN
IMPURITIES
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
Materials science
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
PURIFICATION
Radio-frequency glow discharge optical emission spectrometer
RADIOWAVE RADIATION
SCRUBBERS
SEGREGATION
Segregation coefficient
SELENIUM
SELENIUM HYDRIDES
SODIUM HYDROXIDES
Solidification
SPECTROMETERS
TELLURIUM
ZONE REFINING
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Summary:Ultrapure tellurium (Te) metal has become an important metal in the strategic sector for fabricating high performance infrared devices for thermal imaging and night vision cameras. Zone refining (ZR) is a proven technique for purification of Te. Selenium (Se), present as an impurity in Te, is not easily removed by ZR under normal conditions as the segregation coefficient ( K) is around 0.44–0.50. Hence, ZR was performed in a hydrogen atmosphere, during which Se gets converted to hydrogen selenide at the molten moving zones and carried away into the sodium hydroxide scrubbers. In this study a radio-frequency glow discharge optical emission spectrometer (RF-GDOES) was used for determining the concentration of Se along the 56 cm Te zone-refined bar. It was observed that the initial concentration of 1100 ppb Se was decreased to 30 ppb after 2 cycles.
ISSN:1044-5803
1873-4189
DOI:10.1016/j.matchar.2006.03.013