Résumé
The solid solutions of InGa1-xFexCuO4, InFeCu1-xMg5O4, and InGa1-xFexCu1-xMg5O4 were synthesized and characterized through the use of X-ray and neutron diffraction, and DC magnetism measurements. All compositions of InGa1-xFe5CuO4 are single phase and crystallize in the R (3) over barm 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 InGa(1-x)5Fe(x)CuO(4). In the hexagonal domains, the c/a ratio of InFeCu1-xMBxO4 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-xFe5CuO4 solid solution show that these transitions are consistent with spin glass behavior, not long range AFM ordering. (C) 2012 Elsevier Inc. All rights reserved.