Proton NMR studies of lanthanum nickel hydride: Structure and diffusion |
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Authors: | TK Halstead |
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Institution: | Department of Chemistry, University of York, York, England |
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Abstract: | The proton magnetic resonance spectrum of lanthanum nickel hydride LaNi5.3H6 was measured over the temperature range 118°K < T < 300°K. The second moment of the absorption at 118°K is M2 = 13.4 ± 0.3 G2. Several possible arrangements of the hydrogen atoms are discussed. Narrowing of the line above 140°K is analyzed in terms of proton diffusion and gives an activation enthalpy E = 21 ± 1 kJ mol?1, NMR correlation time pre-exponential 0.2 ps < τc0 < 1.6 ps and a self diffusion coefficient at 300°K of 2 × 10?12 m2 s?1 < D < 2 × 10?11 m2 s?1. |
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