alpha. -hydride (Fe/sub 0. 8/Ni/sub 0. 2/)TiH/sub chi/; The distribution and manifestation of dissolved hydrogen

Cubic {alpha}-hydride (Fe/sub 0.8/Ni/sub 0.2/)TiH/sub chi/ is prepared with rather large dissolved hydrogen, chi=0.14, by cycling a number of times before freezing the sample along the desorption route. From Mossbauer studies, it is inferred that the hydrogen is uniformly distributed in the bulk and...

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Bibliographic Details
Published in:Materials research bulletin 1989-06, Vol.24:6
Main Authors: Raj, P., Suryanarayana, P., Sathyamoorthy, A., Iyer, R.M.
Format: Article
Language:English
Subjects:
360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
400102 - Chemical & Spectral Procedures
400201 - Chemical & Physicochemical Properties
ATOMS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
DEBYE TEMPERATURE
DISSOLVED GASES
ELEMENTS
FLUIDS
GAMMA SPECTROMETERS
GASES
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IRON COMPOUNDS
IRON HYDRIDES
KINETICS
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MOESSBAUER SPECTROMETERS
NICKEL COMPOUNDS
NICKEL HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
REACTION KINETICS
SOLUTES
SPECTROMETERS
SYNTHESIS
TITANIUM COMPOUNDS
TITANIUM HYDRIDES
TRANSITION ELEMENT COMPOUNDS
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Description
Summary:Cubic {alpha}-hydride (Fe/sub 0.8/Ni/sub 0.2/)TiH/sub chi/ is prepared with rather large dissolved hydrogen, chi=0.14, by cycling a number of times before freezing the sample along the desorption route. From Mossbauer studies, it is inferred that the hydrogen is uniformly distributed in the bulk and manifests itself, most markedly, in appreciably reducing the Debye temperature and the force constant experienced by Fe atoms. Estimate of volume per H- atom further supports the uniform bulk distribution of dissolved hydrogen. Using conversion electron Mossbauer spectroscopy, it is shown that there is no hydrogen rich phase at the surface of {alpha}-hydride. Instead, as a result of cycling, an appreciable amount of a ternary oxide phase is formed at the surface.
ISSN:0025-5408
1873-4227
DOI:10.1016/0025-5408(89)90088-3