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CLASSICAL PURIFICATION TECHNIQUES
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
For certain electronic applications, a purity level in materials is demanded far exceeding that needed for the usual application of these materials. While most emphasis has been placed on ultrapure materials for electronic usage, high purity can also produce desirable properties from both the physical and chemical viewpoints. The techniques discussed are generally physical techniques in which purification is achieved by a difference in physical properties of the matrix material and its impurities. The techniques usually involve a phase change in order to achieve purification. In contrast, the Van Arkel process might be considered a chemical purification technique, since purification is achieved in part by the formation and decomposition of a chemical compound. Author