The RENi4Ga (RE = Dy, Ho, Er) intermetallic compounds - Crystal structure and hydride properties

Šorgić, Božica; Blažina, Želimir; Drašner, Antun (1999) The RENi4Ga (RE = Dy, Ho, Er) intermetallic compounds - Crystal structure and hydride properties. Croatica Chemica Acta, 72 (2-3). pp. 567-574. ISSN 0011-1643

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Abstract

New ternary rare earth based intermetallic compounds of the composition RENi4Ga (RE = Dy, Ho, Er) were prepared and studied using X-ray powder diffraction. All compounds were found to be hexagonal and to crystallize in the space group P6/mmm with the CaCu5 type of structure, i.e., the same symmetry as their prototype binaries RENi5. The interaction with hydrogen was also studied. It was found that all intermetallics react readily and reversibly with hydrogen to form hydrides with hydrogen contents of up to 3.48 hydrogen atoms per alloy formula unit at room temperature. The entropy, the enthalpy and the Gibbs free energy of formation have been extracted from the equilibrium plateau in the pressure composition desorption isotherms. The thermodynamic parameters and the hydrogen capacity of the RENi4Ga-hydrogen systems are compared with the corresponding values for their aluminium analogues and briefly discussed.

Item Type:	Article
Uncontrolled Keywords:	rare earth intermetallics; hydrogen sorption; crystal structure; thermodynamic properties; hydrogen sorption properties; thermodynamic properties; system
Subjects:	NATURAL SCIENCES > Chemistry
Divisions:	Division of Materials Chemistry
Projects:	Project title Project leader Project code Project type Intermetalni spojevi i metalni hidridi Želimir Blažina 00980906 MZOS
Depositing User:	Želimir Blažina
Date Deposited:	26 Nov 2013 12:53
URI:	http://fulir.irb.hr/id/eprint/1130

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