Investigation of the hyperstoichiometric Zr/sub 1-x/Ti/sub x/CrFe/sub y/sup -/H/sub 2/ system
Journal Article
·
· J. Solid State Chem.; (United States)
The pressure-composition isotherms and relevant crystallographic, thermodynamic, and kinetic parameters are presented and discussed for the Zr/sub 1-x/Ti/sub x/CrFe/sub y/-H/sub 2/ system with x = 0.1, 0.3 and y = 1.2-1.4. The hyperstoichiometric iron was observed to have a profound effect on the equilibrium dissociation pressure, elevating the plateau pressure several times over that for the corresponding Zr/sub 1-x/Ti/sub x/CrFe hydride. The hydrogen capacities of these quaternary intermetallics are quite high, the volumetric capacity being 1.21 to 1.32 with respect to that of liquid hydrogen, the weight capacity 159.9-178.9 cm/sup 3/ H/sub 2//g alloy. The enthalpies and entropies of dissociation are in the range 27.3-31.1 kJ/mole H/sub 2/ and 100-107.2 J/K mole H/sub 2/, respectively. The dehydrogenation process was found to follow first-order kinetics with an activation energy 43.4 kJ/mole H/sub 2/. The diffusion of atomic hydrogen was considered to be the rate-determining step.
- Research Organization:
- Univ. of Pittsburgh, PA
- OSTI ID:
- 6540355
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Journal Issue: 1 Vol. 67:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Journal Article
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Wed Jan 04 23:00:00 EST 1984
· J. Phys. Chem.; (United States)
·
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Thu Dec 31 23:00:00 EST 1981
·
OSTI ID:6338034
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM HYDRIDES
DATA
DEHYDROGENATION
DIFFUSION
DISPERSIONS
DISSOCIATION HEAT
ELEMENTS
ENTHALPY
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
IRON COMPOUNDS
IRON HYDRIDES
KINETICS
MIXTURES
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION HEAT
REACTION KINETICS
SOLID SOLUTIONS
SOLUTIONS
STOICHIOMETRY
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM HYDRIDES
400201* -- Chemical & Physicochemical Properties
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM HYDRIDES
DATA
DEHYDROGENATION
DIFFUSION
DISPERSIONS
DISSOCIATION HEAT
ELEMENTS
ENTHALPY
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
IRON COMPOUNDS
IRON HYDRIDES
KINETICS
MIXTURES
NONMETALS
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION HEAT
REACTION KINETICS
SOLID SOLUTIONS
SOLUTIONS
STOICHIOMETRY
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM HYDRIDES