ULTRA-PURIFICATION OF ARSENIC |
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Ultrapure arsenic (6N) finds extensive application in electronics industry as III-V compound semiconductors and as a dopant. Arsenic (6N pure) at present is not manufactured in India and needs import. BARC has standardized a protocol for producing 6N (99.9999%) pure arsenic from commercially available arsenic trioxide (99.9%). The product quality obtained is equal to or better than the imported product. The process developed is at a
200 gm batch scale. Ultrapurification of Arsenic The main impurities present in this are antimony, selenium, tellurium, sulphur, phophorus, zinc, copper, cadmium which are elements having similar properties to arsenic or originated from the ore from which arsenic trioxide has been obtained.
The ultrapure arsenic is sealed under high vacuum in previously degassed pyrex glass ampoules for storage. This ensures that purity of the product is maintained. Applications Ultrapure arsenic is used in the manufacture of semiconductor materials such as gallium arsenide, indium arsenide, etc. which are used in high speed opto-electronic devices (gun diodes, laser diodes, light emitting diodes, etc). These applications have created an increased demand for high purity arsenic in recent years. Infrastuctural Requirements
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For details contact :
Head, Technology Transfer & Collaboration Division,
Bhabha Atomic Research Centre,
Trombay. Mumbai - 400 085
Fax: 091-022-25505151
Email: technology@barc.gov.in