The kinetics of the solid-state transformation of marcasite to pyrite have been investigated using infrared spectroscopy. Kinetic analysis using the Johnson-Mehl or Avrami-Erofe'ev equation is based on measurements of infrared absorption intensity made on marcasite samples heated in the temperature range of 698–735 K. From the Arrhenius equation, an activation energy of 253 ± 8 kJ/mol and frequency factor of 4.6 × 1015/min is calculated for the conversion from marcasite to pyrite. The transformation is modeled by a second-order Johnson-Mehl equation suggesting a nucleation and growth model for the formation of pyrite in the marcasite matrix.

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