The solubility of nickel in Mg6Pd compound has been studied by chemical and structural methods. The solubility limit at 673 K attains 9 at% Ni, i.e. more than four times the value previously reported. Therefore, a re-determination of the ternary Mg-Pd-Ni phase diagram in the Mg-rich corner is desirable. Mg-6(Pd,Ni) compounds have the same crystal structure as the binary Mg6Pd compound. The unit-cell composition at the solubility limit is Mg344(2)Pd12(1)Ni36(1) with 75% of Ni atoms substituting Pd ones. Ni substitution occurs on the three crystallographic sites exclusively occupied by Pd in Mg6Pd. The substitution is not fully random. Ni atoms have a slight preference for site with low coordination number. The results reported here enlarge the compositional range in which Mg-6(Pd,Ni) compounds can be used as reversible hydrogen storage materials.

Homogeneity range and crystal structure of Ni substituted Mg6(Pd,Ni) complex intermetallic compounds / F., Cuevas; J. F., Fernandez; J. R., Ares; Leardini, Fabrice; C., Sanchez. - In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - ISSN 0022-3697. - ELETTRONICO. - 71:9(2010), pp. 1259-1263. [10.1016/j.jpcs.2010.05.004]

Homogeneity range and crystal structure of Ni substituted Mg6(Pd,Ni) complex intermetallic compounds

LEARDINI, FABRICE;
2010

Abstract

The solubility of nickel in Mg6Pd compound has been studied by chemical and structural methods. The solubility limit at 673 K attains 9 at% Ni, i.e. more than four times the value previously reported. Therefore, a re-determination of the ternary Mg-Pd-Ni phase diagram in the Mg-rich corner is desirable. Mg-6(Pd,Ni) compounds have the same crystal structure as the binary Mg6Pd compound. The unit-cell composition at the solubility limit is Mg344(2)Pd12(1)Ni36(1) with 75% of Ni atoms substituting Pd ones. Ni substitution occurs on the three crystallographic sites exclusively occupied by Pd in Mg6Pd. The substitution is not fully random. Ni atoms have a slight preference for site with low coordination number. The results reported here enlarge the compositional range in which Mg-6(Pd,Ni) compounds can be used as reversible hydrogen storage materials.
2010
01 Pubblicazione su rivista::01a Articolo in rivista
Homogeneity range and crystal structure of Ni substituted Mg6(Pd,Ni) complex intermetallic compounds / F., Cuevas; J. F., Fernandez; J. R., Ares; Leardini, Fabrice; C., Sanchez. - In: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - ISSN 0022-3697. - ELETTRONICO. - 71:9(2010), pp. 1259-1263. [10.1016/j.jpcs.2010.05.004]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/507647
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