Magnesium-nickel-lanthanum alloy hydrides

Journal Article · Fri Mar 01 04:00:00 EST 1985 · Inorg. Mater. (Engl. Transl.); (United States)

OSTI ID:6466578

Karonik, V V; Andrievskii, R A; Bogachikova, O P; Kazakov, D N

The manner in which magnesium-base multiphase alloys react with hydrogen is largely governed by the alloy structure and phase equilibria. The purpose of this paper is to study how the composition and structure of magnesium-nickel-lanthanum ternary alloy systems affect equilibrium, kinetic, and absorption properties of the corresponding hydrogen-alloy systems. The alloys were studied microscopically and by x-ray diffraction. Decreasing the particle size of the original alloy accelerated activation of the Mg/sub 2/Ni phase. Also studied are dissociation isotherms of hydrides formed in eutetics, and an alloy with primary Mg/sub 2/Ni precipitates. It is concluded that dissociation isotherms for the ternary alloy hydrides show their equilibrium pressures to match the values of MgH/sub 2/ and Mg/sub 2/NiH/sub 4/. The multiphase alloys at 620/sup 0/K are found to have a higher reversible reaction rate with hydrogen than the individual phases making up the alloys. Finally, the magnesium-nickel-lanthanum alloy hydrides are highly stable during about 40 absorption-desorption cycles.

• OSTI ID: 6466578
• Journal Information: Inorg. Mater. (Engl. Transl.); (United States), Journal Name: Inorg. Mater. (Engl. Transl.); (United States) Vol. 20:10; ISSN INOMA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080201 -- Hydrogen-- Chemisorption Storage
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
CRYSTAL STRUCTURE
CRYSTALLOGRAPHY
DESORPTION
DIFFRACTION
ELEMENTS
EQUILIBRIUM
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
LANTHANUM ALLOYS
LANTHANUM COMPOUNDS
LANTHANUM HYDRIDES
MAGNESIUM ALLOYS
MAGNESIUM BASE ALLOYS
MAGNESIUM COMPOUNDS
MAGNESIUM HYDRIDES
MICROSCOPY
NICKEL ALLOYS
NICKEL COMPOUNDS
NICKEL HYDRIDES
NONMETALS
PHASE STUDIES
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SCATTERING
SEPARATION PROCESSES
SORPTION
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION