1 / 1

TEM, Synchrotron X-ray (M. Lucas, WPAFB) and Magnetic Evidence for Exsolution.

Titanomagnetite Decomposition and Magnetic Sensors for Their Terrestrial and Extraterrestrial Observation Michael E. McHenry, Carnegie-Mellon University, DMR 1106943. Mossbauer spectroscopy of cation distributions inTM solid solutions.

lona
Download Presentation

TEM, Synchrotron X-ray (M. Lucas, WPAFB) and Magnetic Evidence for Exsolution.

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Titanomagnetite Decomposition and Magnetic Sensors for Their Terrestrial and Extraterrestrial Observation Michael E. McHenry, Carnegie-Mellon University, DMR 1106943 Mossbauer spectroscopy of cation distributions inTM solid solutions. • The project focuses on the interplay between planetary mineralogy, the materials science of magnetic minerals and extraterresterial sensing of the same. Titanomagnetites (TMs) are important minerals commonly found on Mars. Studies have found that the pseudo-binary Fe3O4-Fe2TiO4 solid solution system decomposes into a phase rich in magnetite which is strongly magnetic, and a phase rich in Fe2TiO4 spinel which is weakly magnetic. The spinodal decomposition is thought to contribution to the large remnant magnetization on Mars. • In order to better understand the titanomagnetites, we need a phase diagram of Fe3O4-Fe2TiO4 system. Evidence of asymmetric miscibility is found under microscopy. We have calculated, enthalpy and entropy of mixing based on Neel-Chevallier’s model of cation distriubution, and magnetic and Coulombic contributions to the enthalpy are considered to develop a schematic phase diagram of the pseudo-binary system. • Researchers from CMU and INTA have instituted a weakly meeting and presentation series to present research on structural and magnetic magnetically sensing these minerals on Mars. Collaborations with Duquesne University, Wright Patterson AFB and Argonne National Lab have contributed to the results shown (right). TEM, Synchrotron X-ray (M. Lucas, WPAFB) and Magnetic Evidence for Exsolution.

More Related