Hydrogen exposure of Tb2Pd2Mg crystallizing in the tetragonal Mo2FeB2 structure results in the absorption 8 ± 1 H/f.u. The absorption is not reversible and leads to a structure transition yielding a new structure type (Pearson symbol oI40, space group Fmmm). Tb2Pd2Mg is an antiferromagnet with TN ≈ 60 K showing 2 metamagnetic transitions. Upon hydrogenation the susceptibility cusp related to AF ordering disappears and the susceptibility increases monotonously with decreasing temperature. Magnetic remanence, which starts to develop below 20–25 K, can be attributed to a randomness in H sites occupancy.
Structure and properties of Tb2Pd2Mg hydride
GIOVANNINI, MAURO;
2017-01-01
Abstract
Hydrogen exposure of Tb2Pd2Mg crystallizing in the tetragonal Mo2FeB2 structure results in the absorption 8 ± 1 H/f.u. The absorption is not reversible and leads to a structure transition yielding a new structure type (Pearson symbol oI40, space group Fmmm). Tb2Pd2Mg is an antiferromagnet with TN ≈ 60 K showing 2 metamagnetic transitions. Upon hydrogenation the susceptibility cusp related to AF ordering disappears and the susceptibility increases monotonously with decreasing temperature. Magnetic remanence, which starts to develop below 20–25 K, can be attributed to a randomness in H sites occupancy.
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