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Eutectic melting in metal borohydrides.

Authors :
Paskevicius, Mark
Ley, Morten B.
Sheppard, Drew A.
Jensen, Torben R.
Buckley, Craig E.
Source :
Physical Chemistry Chemical Physics (PCCP); 2013, Vol. 15 Issue 45, p19774-19789, 16p
Publication Year :
2013

Abstract

A series of monometallic borohydrides and borohydride eutectic mixtures have been investigated during thermal ramping by mass spectroscopy, differential scanning calorimetry, and photography. Mixtures of LiBH<subscript>4</subscript>–NaBH<subscript>4</subscript>, LiBH<subscript>4</subscript>–KBH<subscript>4</subscript>, LiBH<subscript>4</subscript>–Mg(BH<subscript>4</subscript>)<subscript>2</subscript>, LiBH<subscript>4</subscript>–Ca(BH<subscript>4</subscript>)<subscript>2</subscript>, LiBH<subscript>4</subscript>–Mn(BH<subscript>4</subscript>)<subscript>2</subscript>, NaBH<subscript>4</subscript>–KBH<subscript>4</subscript>, and LiBH<subscript>4</subscript>–NaBH<subscript>4</subscript>–KBH<subscript>4</subscript> all displayed melting behaviour below that of the monometallic phases (up to 167 °C lower). Generally, each system behaves differently with respect to their physical behaviour upon melting. The molten phases can exhibit colour changes, bubbling and in some cases frothing, or even liquid–solid phase transitions during hydrogen release. Remarkably, the eutectic melt can also allow for hydrogen release at temperatures lower than that of the individual components. Some systems display decomposition of the borohydride in the solid-state before melting and certain hydrogen release events have also been linked to the adverse reaction of samples with impurities, usually within the starting reagents, and these may also be coupled with bubbling or frothing of the ionic melt. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14639076
Volume :
15
Issue :
45
Database :
Complementary Index
Journal :
Physical Chemistry Chemical Physics (PCCP)
Publication Type :
Academic Journal
Accession number :
100924378
Full Text :
https://doi.org/10.1039/c3cp53920b