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Structural and magnetic investigation of Fe3+ and Mg2+ substitution into the trigonal bipyramidal site of InGaCuO4

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  • The solid solutions of InGa₁₋ₓFeₓCuO₄, InFeCu₁₋ₓMgₓO₄, and InGa₁₋ₓFeₓCu₁₋ₓMgₓO₄ were synthesized and characterized through the use of X – ray and neutron diffraction, and DC – magnetism measurements. All compositions of InGa₁₋ₓFeₓCuO₄ are single phase and crystallize in the R3m space group, but a transformation to the spinel InFeMgO₄ structure was observed for the other series of Fe³⁺ and Mg²⁺ − rich compounds. As a result of the similar ionic radii for Ga³⁺ and Fe³⁺, there was not an obvious change in the c/a ratio for InGa₁₋ₓFeₓCuO₄. In the hexagonal domains, the c/a ratio of InFeCu₁₋ₓMgₓO₄ and InGa₁₋ₓFeₓCu₁₋ₓMgₓO₄ showed a linear trend that can be explained by the change in electronic configurations between Cu²⁺ and Mg²⁺. All hexagonal compositions display negative Weiss temperatures, and there is an increase in the magnetic transition temperature with the addition of Fe³⁺. Additional AC magnetic susceptibility measurements for the x = 0.4 and 0.6 compositions within the InGa₁₋ₓFeₓCuO₄ solid solution show that these transitions are consistent with spin glass behavior, not long range AFM ordering.
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  • Grajczyk, R., Berthelot, R., Muir, S., Sleight, A., & Subramanian, M. (2013). Structural and magnetic investigation of Fe3+ and Mg2+ substitution into the trigonal bipyramidal site of InGaCuO4. Journal of Solid State Chemistry, 199, 102-108. doi: 10.1016/j.jssc.2012.12.010
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  • 199
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  • The published article can be found at Journal of Solid State Chemistry - Elsevier
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  • This work was supported by NSF Grant DMR 0804167. This research at Oak Ridge National Laboratory’s Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy under contract DE-AC05-00OR22725 with UT Battelle, LLC.
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