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Published on: December 19, 2017
Thermal Behavior of Iron Arsenides Under Non-Oxidizing Conditions
Ainur Seitkan1, Giulio I Lampronti2, Remo N Widmer2
1School of Natural Sciences, Astana International University, Nur-Sultan 010000, Kazakhstan.
Abstract:
Fe2As has been studied in situ by synchrotron powder X-ray diffraction (PXRD) over the range of temperatures 25-850 °C and under a neutral atmosphere to understand its thermal behavior, which is potentially important for gold extraction. For the first time, incongruent high-temperature reactions of Fe2As are observed as it breaks down and the existence of a previously undiscovered high-temperature FeAs phase with an NiAs-type structure has been determined experimentally. No evidence has been found for the existence of the high-temperature Fe3As2 phase. Hence, the previously published phase diagram for the Fe-As system has to be modified accordingly.
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