The Role of Atmosphere on Phase Transformations and Magnetic Properties of Ulvospinel

• Published in: IEEE transactions on magnetics Vol. 49; no. 7; pp. 4273 - 4276
• Main Authors: Groschner, Catherine, Lan, Song, Wise, Adam, Leary, Alex, Lucas, Matthew S., Park, Changyong, Laughlin, David E., Diaz-Michelena, Marina, McHenry, Michael E.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.07.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Atmosphere; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic properties; Magnetism; Magnetization; Magnetosphere; Martian mineral; Materials science; Minerals; Other topics in materials science; Physics; remnant magnetization; Temperature; thermal magnetic property; titanomagnetite; X-ray scattering; Thermal properties; Magnetization; Phase transformations; thermal magnetic property; Martian mineral; titanomagnetite; remnant magnetization; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2013.2250928

We have synthesized the antiferromagnetic mineral ulvospinel, Fe 2 TiO 4, in Ar to assess the role of inert atmosphere on phase formation and magnetic properties. We report the role of atmosphere on a possible phase transition and the magnetic properties of this mineral. Atmosphere dependent transformations of ulvospinel are observed with increasing temperature. Oxidation of ulvospinel to form metastable titanomaghemite is shown to occur at 300° in atmospheric conditions. Only slight titanomaghematitzation was observed in samples transformed under pressure in in situ temperature dependent X-ray experiments. Formation of ilmenite and hematite from ulvospinel was observed under high temperature, high pressure, and low oxygen atmosphere conditions.