Preliminary thermal diffusion experiments on metal-sulfide liquids indicate that the Soret effect can be of comparable magnitude in metallic system as in silicate systems. In the Fe-Ni-S-P system, S segregates to the hot end of the diffusion couple, P and Fe segregate to the cold end, Ni remains almost unaffected, and the magnitude of the P Soret coefficient increases as S increases. This is because the nonideal interactions between S and P increase dramatically as the concentration of either element increases. The Soret coefficient for P changes in approximate accordance with the model of Jones and Malvin (1990) for changes in (P)D(solid metal/liquid metal). This observation reinforces the Jones and Malvin model and provides a basis for predicting the magnitude of Soret coefficients for minor elements in systems that have not yet been explored experimentally. The sense of the Soret segregation, with P going to the cold end and S going to the hot end, is in accordance with the predictions of Malvin et al. (1986), who speculated that the crystal-pulling experiments of Sellamuthu and Goldstein (1985) might have been influenced by the Soret effect.
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