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Thermal Behavior of Iron Arsenides Under Non-Oxidizing Conditions.


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.

SUBMITTER: Seitkan A 

PROVIDER: S-EPMC7114163 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature

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Thermal Behavior of Iron Arsenides Under Non-Oxidizing Conditions.

Seitkan Ainur A   Lampronti Giulio I GI   Widmer Remo N RN   Casati Nicola P M NPM   Redfern Simon A T SAT  

ACS omega 20200320 12


Fe<sub>2</sub>As has been studied <i>in situ</i> 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 Fe<sub>2</sub>As 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 experimenta  ...[more]

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