Quasielastic neutron scattering study of hydrogen motion in C15-type TaVH
Journal of Physics Condensed Matter, ISSN: 0953-8984, Vol: 10, Issue: 8, Page: 1787-1801
1998
- 64Citations
- 4Captures
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Article Description
In order to clarify the mechanism of hydrogen diffusion in cubic Laves phase TaV, we have performed high-resolution quasielastic neutron scattering measurements on TaVH (x = 0.6 and 1.1) in the temperature range 10-320 K. It is found that the diffusive motion of hydrogen in this system can be described in terms of two jump processes: the fast localized H motion within hexagons formed by interstitial g (TaV) sites and the slower hopping from one hexagon to the other. This model is also supported by neutron diffraction measurements showing that the sublattice of g sites in TaVD is split into hexagons well separated from each other. The behaviour of the elastic incoherent structure factor for TaVH suggests that only a fraction of the H atoms participate in the fast localized motion, and this fraction increases with temperature. Comparison of the properties of TaVH and other Laves phase hydrides with g-site occupation shows a clear correlation between the parameters of the two jump processes and the g-g distances r (within the hexagons) and r (between different hexagons).
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0000989218&origin=inward; http://dx.doi.org/10.1088/0953-8984/10/8/012; https://iopscience.iop.org/article/10.1088/0953-8984/10/8/012; https://dx.doi.org/10.1088/0953-8984/10/8/012; https://validate.perfdrive.com/fb803c746e9148689b3984a31fccd902/?ssa=90312e55-5131-4891-988a-fb64bd48f608&ssb=76878287630&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.1088%2F0953-8984%2F10%2F8%2F012&ssi=97550edf-8427-4daf-9a71-c749993161f6&ssk=support@shieldsquare.com&ssm=936427967398805051387391106584461433&ssn=1152a224de70578cb16af078426e3a847ab617f9ea44-4e1f-4e35-b11738&sso=f4a0915e-f9d9f87a371fce0ec16f92f9ac5420ac5fdfb9bfa228127f&ssp=40276946001719397880171981347533059&ssq=33097622284831115951705699762225368734085&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJyZCI6ImlvcC5vcmciLCJfX3V6bWYiOiI3ZjYwMDBjMGI2MzM1NC00OGRkLTRjNTUtODVmZS00NzZmMjgxYzE5ZDgxNzE5MzA1Njk5NDA1NTE3MTQ5MzM1LWVhMWQ5Yzc3NzYwYTJhNGExMzg3MjciLCJ1em14IjoiN2Y5MDAwMWUxYTVkMGQtYjRlNi00ZTQ0LWFmYTgtNzUxMTFmZjg0ZDlmNy0xNzE5MzA1Njk5NDA1NTE3MTQ5MzM1LTAxOGM1NzQzOTEyYWQxYTMxMzg3MjQifQ==
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