Mo partitioning between crystalline and liquid metal alloy shows a continuous change with pressure from siderophile to chalcophile behavior at 1100 degrees C in the interval 0-60 kbar. Pressure is shown to be only a minor direct causative factor in this change. Unusual Fe-S liquid solution behavior causes Fe to dissolve instead of precipitate from solution with increasing pressure to 60 Bar at temperatures up to similar to 1375 degrees C. This pathology drives changes in D-Mo that overshadow any direct pressure effect on D-Mo. The ability to separate the pressure and compositional effects on D-Mo arises through the warpage in pressure of the Fe-S liquidus. (C) 2007 Elsevier B.V. All rights reserved.
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