Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds

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 (Mg3Nb6O11) was synthesized for the first time in nearly pure form reported in this...

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Autor principal:	Md. Wasikur Rahman
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a5ee20964bbc4a8fbf121a717065cac9
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spelling	oai:doaj.org-article:a5ee20964bbc4a8fbf121a717065cac92021-12-02T18:50:50ZSynthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds10.1038/s41598-021-95690-42045-2322https://doaj.org/article/a5ee20964bbc4a8fbf121a717065cac92021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95690-4https://doaj.org/toc/2045-2322Abstract 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 (Mg3Nb6O11) was synthesized for the first time in nearly pure form reported in this context. MgNb2O6 and Mg4Nb2O9 were prepared in oxidizing conditions; on the contrary, Mg3Nb6O11 preferred reducing environment. Stoichiometric mixtures of the precursor materials MgO, Nb2O5 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 MgNb2O6 synthesis and the heat of formation of the solid-state reaction obtained to be minimum (93 kJ/mol). In contrast, the formation of Mg4Nb2O9 and Mg3Nb6O11 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.Md. Wasikur RahmanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Md. Wasikur Rahman Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds
description	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 (Mg3Nb6O11) was synthesized for the first time in nearly pure form reported in this context. MgNb2O6 and Mg4Nb2O9 were prepared in oxidizing conditions; on the contrary, Mg3Nb6O11 preferred reducing environment. Stoichiometric mixtures of the precursor materials MgO, Nb2O5 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 MgNb2O6 synthesis and the heat of formation of the solid-state reaction obtained to be minimum (93 kJ/mol). In contrast, the formation of Mg4Nb2O9 and Mg3Nb6O11 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.
format	article
author	Md. Wasikur Rahman
author_facet	Md. Wasikur Rahman
author_sort	Md. Wasikur Rahman
title	Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds
title_short	Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds
title_full	Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds
title_fullStr	Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds
title_full_unstemmed	Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds
title_sort	synthetic approach of ternary magnesium niobate (mg–nb–o) compounds
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/a5ee20964bbc4a8fbf121a717065cac9
work_keys_str_mv	AT mdwasikurrahman syntheticapproachofternarymagnesiumniobatemgnbocompounds
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Synthetic approach of ternary magnesium niobate (Mg–Nb–O) compounds

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