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329 results on '"Hauback B.C."'

107. Simultaneous desorption behavior of M borohydrides and Mg2FeH6 reactive hydride composites (M = Mg, then Li, Na, K, Ca)

Author

Chaudhary, A.-L., Li, G., Matsuo, M., Orimo, S., Deledda, S., Soerby, M.H., Hauback, B.C., Pistidda, C., Klassen, T., and Dornheim, M.

Subjects
ddc:620.11
Abstract

Combinations of complex metal borohydrides ball milled with the transition metal complex hydride, Mg2FeH6, are analysed and compared. Initially, the Reactive Hydride Composite (RHC) of Mg2+ cation mixtures of Mg2FeH6 and γ-Mg(BH4)2 is combined in a range of molar ratios and heated to a maximum of 450 °C. For the molar ratio of 6 Mg2FeH6 + Mg(BH4)2, simultaneous desorption of the two hydrides occurred, which resulted in a single event of hydrogen release. This single step desorption occurred at temperatures between those of Mg2FeH6 and γ-Mg(BH4)2. Keeping this anionic ratio constant, the desorption behavior of four other borohydrides, Li-, Na-, K-, and Ca-borohydrides was studied by using materials ball milled with Mg2FeH6 applying the same milling parameters. The mixtures containing Mg-, Li-, and Ca-borohydrides also released hydrogen in a single event. The Mass Spectrometry (MS) results show a double step reaction within a narrow temperature range for both the Na- and K-borohydride mixtures. This phenomenon, observed for the RHC systems at the same anionic ratio with all five light metal borohydride mixtures, can be described as simultaneous hydrogen desorption within a narrow temperature range centered around 300 °C.

Published
2015
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109. Hydrogen storage properties of γ–Mg(BH4)2 modified by MoO3 and TiO2

Author

Saldan, I., primary, Frommen, C., additional, Llamas-Jansa, I., additional, Kalantzopoulos, G.N., additional, Hino, S., additional, Arstad, B., additional, Heyn, R.H., additional, Zavorotynska, O., additional, Deledda, S., additional, Sørby, M.H., additional, Fjellvåg, H., additional, and Hauback, B.C., additional

Published
2015
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112. Hindered Rotational Energy Barriers of BH4 Tetrahedra in beta-Mg(BH4)(2) from Quasielastic Neutron Scattering and DFT Calculations

Author

Blanchard, D., Maronsson, J.B., Riktor, M.D., Kheres, J., Sveinbjörnsson, D., Gil Bardaji, E., Léon, A., Juranyi, F., Wuttke, J., Lefmann, Kim, Hauback, B.C., Fichtner, M., Vegge, T., Blanchard, D., Maronsson, J.B., Riktor, M.D., Kheres, J., Sveinbjörnsson, D., Gil Bardaji, E., Léon, A., Juranyi, F., Wuttke, J., Lefmann, Kim, Hauback, B.C., Fichtner, M., and Vegge, T.

Published
2012

114. Bromide substitution in lithium borohydride, LiBH4-LiBr

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Rude, L.H., Zavorotynska, O., Arnbjerg, L.M., Ravnsbaek, D.B., Malmkjaer, R.A., Grove, H., Hauback, B.C., Baricco, M., Filinchuk, Yaroslav, Besenbacher, F., Jensen, T.R., UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Rude, L.H., Zavorotynska, O., Arnbjerg, L.M., Ravnsbaek, D.B., Malmkjaer, R.A., Grove, H., Hauback, B.C., Baricco, M., Filinchuk, Yaroslav, Besenbacher, F., and Jensen, T.R.

Published
2011

115. Structural studies of lithium zinc borohydride by neutron powder diffraction, Raman and NMR spectroscopy

Author

UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Ravnsbaek, D.B., Frommen, C., Reed, D., Filinchuk, Yaroslav, Sorby, M., Hauback, B.C., Jakobsen, H. J., Book, D., Besenbacher, F., Skibsted, J., Jensen, T.R., UCL - SST/IMCN/MOST - Molecules, Solids and Reactivity, Ravnsbaek, D.B., Frommen, C., Reed, D., Filinchuk, Yaroslav, Sorby, M., Hauback, B.C., Jakobsen, H. J., Book, D., Besenbacher, F., Skibsted, J., and Jensen, T.R.

Abstract

The crystal structure of LiZn2(BH4)5 is studied in detail using a combination of powder neutron diffraction (PND), Raman spectroscopy, and 11B MAS NMR spectroscopy on LiZn2(BH4)5 and LiZn2(11BD4)5. The aim is to obtain detailed structural knowledge of the first interpenetrated framework hydride compound, LiZn2(BD4)5 which consists of doubly interpenetrated 3D frameworks built from dinuclear complex ions [Zn2(BD4)5]− and lithium ions. The positions of the deuterium atoms are determined using Rietveld refinement of the PND data and the orientation of one of the four independent BD4− groups is revised. The current data reveal that the structure of [Zn2(BD4)5]− is more regular than previously reported, as are also the coordinations around the Zn and Li atoms. Both Zn and Li atoms are found to coordinate to the BD4− units via the tetrahedral edges. Some distortion of the angles within the BD4 units is observed, relative to the expected angles of 109.4 for the ideal tetrahedral coordination. Raman spectroscopy confirms bending and stretching modes from the expected terminal and bridging bidentate BH4ˉ and BD4ˉ units. The 11B MAS NMR spectrum of the satellite transitions resolves two distinct manifolds of spinning sidebands, which allows estimation of the 11B quadrupole coupling parameters and isotropic chemical shifts for the four distinct 11B sites of [Zn2(BD4)5]−. These parameters agree favorably well with the isotropic triple-quantum shifts, observed in an 11B MQMAS NMR experiment. The present results may aid in the development and understanding of new borohydride materials for applications as fast ion conductors or as materials for hydrogen storage.

Published
2011

124. Bromide substitution in lithium borohydride, LiBH4–LiBr

Author

Rude, L.H., primary, Zavorotynska, O., additional, Arnbjerg, L.M., additional, Ravnsbæk, D.B., additional, Malmkjær, R.A., additional, Grove, H., additional, Hauback, B.C., additional, Baricco, M., additional, Filinchuk, Y., additional, Besenbacher, F., additional, and Jensen, T.R., additional

Published
2011
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