INVESTIGADORES
GENNARI Fabiana Cristina
artículos
Título:
Synthesis of Mg2FeH6 by reactive mechanical alloying: Formation and decomposition properties
Autor/es:
F. C. GENNARI; F. J. CASTRO; ANDRADE GAMBOA J.
Revista:
JOURNAL OF ALLOYS AND COMPOUNDS
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2002 vol. 339 p. 261 - 267
ISSN:
0925-8388
Resumen:
The
Mg FeH hydride was synthesized by reactive mechanical alloying (RMA) in a single
process from Mg and Fe elemental powders in a hydrogen atmosphere at room
temperature. The formation of Mg FeH involves two steps: MgH2 formation at
shorter milling times, and reaction between MgH2 and Fe to produce Mg2FeH6 as
milling time increases. On the contrary, the decomposition of Mg2FeH6 occurs in
only one step, giving the elemental metals and hydrogen gas as reaction
products. The presence of Fe in the mixture also produces a catalytic effect on
hydrogen desorption kinetics from MgH2. This is evidenced by a reduction of the
decomposition temperature in more than 100 C.