Abstract
The decay of a monosulphide solid solution (mss) with the composition (Fe1−1Nix)0.96S was investigated by means of differential scanning calorimetry in the temperature range, from 20 to 305‡C. Thermal effects of various natures were detected: Ni atoms are the defects in the magnetic ordering of themss generated by the Fe atoms in the metal sublattice. Thus, the driving force for pentlandite exsolution is the removal of Ni atoms from the magneticmss into the nonmagnetic pentlandite. This is the reason why the Fe∶Ni ratio in the generated pentlandite is much higher than that in the initialmss.
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