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Record Details

Record 18 of 3287
Silicon oxidation in fluoride solutions
Author and Affiliation:
Sancier, K. M.(SRI International Corp., Menlo Park, CA, United States)
Kapur, V.(SRI International, Menlo Park, Calif., United States)
Abstract: Silicon is produced in a NaF, Na2SiF6, and Na matrix when SiF4 is reduced by metallic sodium. Hydrogen is evolved during acid leaching to separate the silicon from the accompanying reaction products, NaF and Na2SiF6. The hydrogen evolution reaction was studied under conditions simulating leaching conditions by making suspensions of the dry silicon powder in aqueous fluoride solutions. The mechanism for the hydrogen evolution is discussed in terms of spontaneous oxidation of silicon resulting from the cooperative effects of (1) elemental sodium in the silicon that reacts with water to remove a protective silica layer, leaving clean reactive silicon, and (2) fluoride in solution that complexes with the oxidized silicon in solution and retards formation of a protective hydrous oxide gel.
Publication Date: Aug 01, 1980
Document ID:
19800062976
(Acquired Nov 30, 1995)
Accession Number: 80A47146
Subject Category: INORGANIC AND PHYSICAL CHEMISTRY
Document Type: Journal Article
Publication Information: Electrochemical Society; vol. 127
Publisher Information: United States
Contract/Grant/Task Num: JPL-954471; NAS7-100
Financial Sponsor: NASA; United States
Organization Source: SRI International Corp.; Menlo Park, CA, United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: CHEMICAL REACTIONS; FLUORIDES; HYDROGEN; OXIDATION; SILICON OXIDES; ALKALIES; LEACHING; POWDER (PARTICLES); REACTION KINETICS; SODIUM FLUORIDES
Imprint And Other Notes: Electrochemical Society, Journal, vol. 127, Aug. 1980, p. 1848-1851.
Miscellaneous Notes: Aug. 1980, p. 1848-1851
Availability Source: Other Sources
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