Abstract
The hexagonal NiAs-type phase in the ternary system Fe−Ni−Te was investigated by thermal, X-ray and susceptibility measurements from 100 up to 1000K. The high temperature phase δ′-FeTe (≈Fe2Te3), which is stable only above 520°C was stabilized at lower temperatures by the partial substitution of iron by nickel. Alloys containing less iron than two thirds of the total metal amount were found to be stable even down to room temperature. Due to the continuous addition of iron the weak constant paramagnetism of δ-NiTe increased and became temperature dependent. The variation of the magnetic susceptibilities with temperature in specimens with a high iron content was indicative of magnetic interactions between iron atoms. It was concluded that at low temperatures Fe2Te3 exhibits an antiferromagnetic order which is destroyed somewhere between room temperature and 520°C.
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