57Fe Mössbauer studies of nickel hydride

Springer Science and Business Media LLC - 1988
M. A. Amer1, F. E. Wagner1, H. J. Bauer2
1Physik-Department, Technische Universität Müchen, Garching, W.-Germany
2Sektion Physik, Ludwig-Maximilans-Universität, München, W.-Germany

Tóm tắt

Nickel loaded with hydrogen electrolytically or under high pressure was studied by57Fe Mössbauer spectroscopy on dilute substitutional iron solutes. Experiments in external magnetic fields at 4.2 K show that Fe species in nickel hydride have magnetic moments between about 4.7 and 2.5 μB and saturation hyperfine fields between 24 and 17 T, depending on the number of nearest hydrogen neighbours. By quenching hydride samples from ambient to liquid nitrogen temperature, non-equilibrium hydrogen distributions in the vicinity of the iron can be frozen in. They relax towards equilibrium between 130 and 150 K within hours, permitting information on hydrogen jump rates to be obtained.

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