Introduction to metal hydrides of A6B23 compounds
This chapter provides an introduction to metal hydrides of A6B23 compounds.
The hydrogenation properties of A6B23 compounds have been mainly studied for binary and pseudobinary compounds with A = Y, Th, and RE and B = Mn and Fe. They absorb generally less than 1 H/M and form stable hydrides with low equilibrium pressure near RT; the H reversibility is therefore limited. For these reasons, they have not been used for hydrogen storage applications compared to other intermetallic compounds (AB, AB2, AB3, and AB5) which can absorb larger H content. Nevertheless, the hydrogenation properties of A6B23 hydrides have been investigated in particular to study the influence of hydrogen absorption on their magnetic properties.
number of moles of hydrogen by mole of metal atom