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La2−xSrxCoTiO6 (0.6 ≤ x ≤ 1.0) compound series is prepared by Sr-substitution in the A-site of the perovskite by a modified Pechini procedure under air. Charge compensation as Sr2+ content increase occurs by Co2+ oxidation to Co3+. Reduced samples are obtained by further treatment under 5%H2/Ar and characterized by Neutron Powder Diffraction. Upon redution, Co3+ to Co2+ reduction and oxygen vacancies...
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