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- W2019962587 abstract "Abstract Cation deficient spinels Ni x Mn 3− x □ 3 δ /4 O 4+ δ (0≤ x ≤1) have been prepared by thermal decomposition of mixed oxalates Ni x /3 Mn (3− x )/3 (C 2 O 4 )· n H 2 O in air at 623 K. They have been characterised by temperature programmed reduction (TPR) under H 2 , the reaction being followed by gravimetric and powder X-ray diffraction measurements. It has been shown that TPR proceeds in several steps. The first steps correspond to the loss of nonstoichiometric oxygen leading to the formation of a stoichiometric oxide. During the following stages the manganese cations are reduced, causing the spinel structure to be destroyed, and the formation of solid solution of NiO in a cubic MnO. Subsequently, Ni 2+ cations undergo a reduction to metallic nickel, and, finally, a mixture of nonstoichiometric MnO 1− δ and metallic nickel is formed. These oxides contain a high level of vacancies which vary with the nickel content with a maximum of δ ≈1 near x =0.6. This nonstoichiometry is ascribed both to the presence of Ni 3+ and excess of Mn 4+ ." @default.
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- W2019962587 date "1998-07-02" @default.
- W2019962587 modified "2023-10-17" @default.
- W2019962587 title "Characterization of nonstoichiometric nickel manganite spinels NixMn3−x□3δ/4O4+δ by temperature programmed reduction" @default.
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- W2019962587 doi "https://doi.org/10.1016/s0167-2738(98)00132-5" @default.
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