Abstract

Concentrations of up to 20 mol.% Dy have been substituted for tetravalent cerium in the perovskite BaCeO 3. 161Dy Mössbauer spectroscopy demonstrates that the dysprosium in this host is present in the trivalent oxidation state. Effective magnetic moments obtained on the same samples confirm these findings. Line broadening as a function of dysprosium concentration, observed from both X-ray and Mössbauer measurements, is attributed to the presence of lattice defects (oxygen vacancies) which are necessary for charge compensation.

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