Abstract
Fe1-xS shows a phase transition of first order at about 140 °C. The hexagonal low temperature phase of p-type having a superstructure of the NiAs-type changes into the high-temperature phase having the NiAs-type structure. Electrical resistivity, thermoelectric power, and magnetic susceptibility of Fe1−xS single crystals are measured in dependence on x. The electrical properties of the low-temperature phase change with x and may be explained by the presence of Fe-vacancies. The transition temperature decreases linearly with x, the hysteresis of the phase transition increases linearly with x. Fe1.00S has a transition temperature of 152 °C.
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http://onlinelibrary.wiley.com.sci-hub.cc/doi/10.1002/pssa.2210340219/abstract
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