Kinetics and mechanism of transformations in iron-rich pyrrhotites and in troilite-pyrrhotite metastable assemblages |
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Authors: | G V Novikov V K Egorov V I Popov L V Sipavina |
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Institution: | 1. Institute of Experimental Mineralogy, Academy of Sciences of the USSR, Chernogolovka, Moskow District, USSR
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Abstract: | Iron-rich pyrrhotites proved to be metastable and to decompose at 70–140° C to troilite and pyrrhotite with less iron content as shown by nuclear gamma-resonance (Mössbauer) studies at high temperatures. Coherence of decomposition product lattices was established by studying powder samples textured in a magnetic field. Detailed X-ray powder diffraction and Mössbauer investigations revealed two different mechanisms of transformation in metastable associations. Kinetic phenomena are discussed in terms of a thermodynamic model of two-phase assemblage. |
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