Absorption of Nitrogen by Molten Chrominum at High Temperatures

Abstract

The solubility of nitrogen in liquid chrominum has been determined by a levitation melting technique 2220 to 2570 K.
The observed solubility negatively deviates from Sieverts’ law at all temperatures investigated, and, above about 2370K, also shows a negative deviation from the high temperature extrapolation of the solubility-temperature relation obtained at 2220 to 2270 K.
Correcting the observed solubility of nitrogen for the above deviations due to (i) thermal diffusion of a N₂-Ar gas mixture, (ii) absorption of nitrogen by metal vapor, and (iii) dilution of nitrogen by metal vapor leads to
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\ oindentwhich is larger than that in liquid iron or manganese and decreases with increasing temperature.
Further, the pair interactions between Cr-N atoms and between N atoms in liquid Cr-N alloy have been discussed in terms of the oscillatory potential combined with a quasi-chemical model. Charge transfer is shown as such that Cr-and N-atoms are ionized to Cr^+4.2 and N^−1.2, respectively. These charge values are in accord with X-ray diffraction data and Pauling’s theory of atomic valency.