Abstract
Abstract The complex oxides with a pyrochlore-related structure, Ln 2 Mn 2 3 Ta 4 3 O 7 , have been synthesized by the usual ceramic method in a reducing atmosphere at 1523 K. The X-ray diffraction patterns of these compounds can be indexed by a hexagonal symmetry. The lattice parameters of the hexagonal crystal are linearly dependent on the ionic radii of Ln3+. The chemical stability range of Ln 2 Mn 2 3 Ta 4 3 O 7 phases was determined by the isothermal thermogravimetric analysis at 1273 K. The temperature dependence of the magnetic susceptibility of Eu 2 Mn 2 3 Ta 4 3 O 7 obeys the Curie-Weiss law in the temperature range above 77 K, and the valence numbers of rare earth, manganese and tantalum are 3+, 2+ and 5+ respectively. The results of electrical conductivity exhibit a semiconducting property in the measured temperature range.
Published Version
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