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Presentation
Structural Modifications of Lanthanum Orthoferrite Ion Transport Membranes By Divalent Ion Substitutions
Los Alamos National Laboratory (2012)
  • Darryl P. Butt, Boise State University
Abstract

This research looks at the stability of specific LaxA1-xFeO3-y , perovskite-type, materials that are candidate for use in future commercial gas separation processes including Syngas (CO-H2) production. These materials would be expected to survive for long times under highly reducing as well as oxidizing conditions to temperatures approaching 1000°C. Using a combination of x-ray and neutron diffraction, dilatometry, electron microscopy, magnetometry, TGA, DSC, and DTA, the phase relations and stability of LaxA1-xFeO3-y were assessed, with emphasis on understanding the behavior of LaxA1-xFeO3-y and certain derivatives. Several interesting phase transformations were observed including a ferro- to paramagnetic phase transformation near 400°C and an orthorhombic to rhombohedral transformation near 900°C. Reitfeld refinement and neutron diffraction were used to assess atomic positions of atoms and vacancies in order to characterize the mechanisms of the phase transformations.

Publication Date
August 13, 2012
Citation Information
Darryl P. Butt. "Structural Modifications of Lanthanum Orthoferrite Ion Transport Membranes By Divalent Ion Substitutions" Los Alamos National Laboratory (2012)
Available at: http://works.bepress.com/darryl_butt/31/