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Hydrogen sorption properties of Ternary Mg–Nb–O phases synthesized by solid–state reaction

✍ Scribed by M.W. Rahman; S. Livraghi; F. Dolci; M. Baricco; E. Giamello

Publisher
Elsevier Science
Year
2011
Tongue
English
Weight
632 KB
Volume
36
Category
Article
ISSN
0360-3199

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✦ Synopsis

Three MgeNbeO compounds were synthesized in order to understand the role of oxides as promoters/catalysts for hydrogen storage in Mg/MgH 2 systems. Ternary MgeNbeO compounds were prepared by solid-state reactions. The effect of calcination temperature on phase formation and chemical composition of the solid-state products were studied by X-ray diffraction. Gradual reaction of precursor components and simultaneous formation of solid-state products were found to be strongly dependent on calcination conditions. Hydrogen sorption properties were investigated by Mass Spectrometry. MgNb 2 O 6 and Mg 4 Nb 2 O 9 phases were rather inactive with respect to hydrogen. On the contrary, Mg 3 Nb 6 O 11 compound showed remarkable uptake and release of molecular hydrogen. The reversible hydrogen interaction with this phase is discussed with respect to octahedral niobium clusters present in the oxide structure.

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Phase structure and electrical properties of 0.8Pb(Mg1/3Nb2/3)O3–0.2PbTiO3 relaxor ferroelectric ceramics prepared by the reaction-sintering method
✍ Chenlu Ding; Bijun Fang; Qingbo Du; Limin Zhou 📂 Article 📅 2009 🏛 John Wiley and Sons 🌐 English ⚖ 805 KB

## Abstract Phase pure perovskite 0.8Pb(Mg~1/3~Nb~2/3~)O~3~–0.2PbTiO~3~ (0.8PMN–0.2PT) ferroelectric (FE) ceramics were prepared by the reaction‐sintering method at a sintering temperature range of 1200–1250 °C. The sintered ceramics exhibit large relative density, where the 0.8PMN–0.2PT ceramics s