Shinku

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The evaporation characteristics of iron-nickel alloys at high temperature in high vacuum were studied in the ranges of composition from 10 to 90 atomic percent of iron and of temperature between 1400°C and 1800°C. The evaporator was the double crucible of BeO for practical use with the similar structure to that of Knudsen Is cell (see Fig. 2). The compositions of samples deposited continuously on each individual glass substrate one by one were determined by chemical microanalysis (using spectrophoto metric method). By plotting the contents of either iron or nickel in deposits against evaporation time and extrapolating them to the origin of time scale, the composition of deposit corresponding to the original composition of alloy could be obtained. Then, basing on these data, so-called x-y curves and values of relative volatilities, representing the fractionation power, were obtained for Fe-Ni systems. Such results are discussed and the behaviour of mass transportation in molten alloy on the progression of evaporation in the crucible is explained with a model.

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