| Issue |
J. Phys. IV France
Volume 03, Number C8, Décembre 1993
IX International Conference on Small Angle Scattering
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|---|---|---|
| Page(s) | C8-287 - C8-290 | |
| DOI | https://doi.org/10.1051/jp4:1993856 | |
J. Phys. IV France 03 (1993) C8-287-C8-290
DOI: 10.1051/jp4:1993856
Phase separation in titanium hydrides studied by small-angle neutron scattering
I.O. BASHKIN1, A.I. KOLESNIKOV1, V.Yu. MALYSHEV1, E.G. PONYATOVSKY1, S. BORBÉLY2, L. ROSTA2 and G. PÉPY31 Institute of Solid State Physics of the Russian Academy of Sciences, Chernogolovka 142432, Russia
2 Research Institute for Solid State Physics, P.O. Box 49, 1525 Budapest, Hungary
3 Laboratoire Léon Brillouin, CEN Saclay, 91191 Gif-sur-Yvette cedex, France
Abstract
Various phases of titanium hydrides with differing hydrogen and deuterium content are studied by small-angle neutron scattering. The low temperature metastable [MATH] phase produced by quenching under high pressure shows small, but pronounced scattering at liquid nitrogen temperature. At 140 K a very abrupt increase in the scattered intensity is detected, more than one order of magnitude for less than 30 s. The scattering from the room temperature (α+γ) phase is analysed by the fractal as well as the random two-phase model. The fit does not prove fractal behaviour of the α-Ti precipitates in the γ-TiH(D)1 matrix. A good representation is obtained in a random two-phase model, giving about 50 and 60 Å correlation lengths, independently of the deuterium or hydrogen content. For the α phase, only the asymptotic behaviour of the scattering curves is observed in the scattering vector range covered in the experiments.
© EDP Sciences 1993