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• W3189204098 abstract "Abstract Magnesium based niobium oxides (Mg–Nb–O) were prepared by solid-state reactions owing to understand the function of transition metal oxides as promoters/catalysts for practical application. Magnesium niobate (Mg 3 Nb 6 O 11 ) was synthesized for the first time in nearly pure form reported in this context. MgNb 2 O 6 and Mg 4 Nb 2 O 9 were prepared in oxidizing conditions; on the contrary, Mg 3 Nb 6 O 11 preferred reducing environment. Stoichiometric mixtures of the precursor materials MgO, Nb 2 O 5 and/or metallic Nb were annealed for the syntheses which revealed the effect of temperature on phase formation, reaction kinetics and heat of reaction. The products were examined by ex-situ, in-situ X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Crystallographic parameters of various binary and ternary compounds (Mg/Nb/O) formed in different calcination conditions, were extracted by Rietveld method. In-situ experiment results in single step reaction for the MgNb 2 O 6 synthesis and the heat of formation of the solid-state reaction obtained to be minimum (93 kJ/mol). In contrast, the formation of Mg 4 Nb 2 O 9 and Mg 3 Nb 6 O 11 compounds towards pure phases rather complicated due to multistep reactions and corresponding heat of formation were estimated to be 140 and 190 kJ/mol. Experimental results have been discussed based on kinetic and thermodynamic constrains." @default.
• W3189204098 created "2021-08-16" @default.
• W3189204098 creator A5058389362 @default.
• W3189204098 date "2021-08-09" @default.
• W3189204098 modified "2023-09-25" @default.
• W3189204098 title "Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds" @default.
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• W3189204098 doi "https://doi.org/10.1038/s41598-021-95690-4" @default.
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