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- W1975769642 abstract "We report the results of measurements of the proton ${(}^{1}$H) spin-lattice relaxation rate ${mathit{R}}_{1}$ at high temperatures (to ensuremath{sim}1400 K) in the hcp (ensuremath{alpha}) solid-solution phases of the Sc-H, Y-H, and Lu-H systems, and of ${mathit{R}}_{1}$${(}^{45}$Sc) in Sc-H and Sc-D solid solutions. The latter measurements show unambiguous evidence of an anomalous increase at ensuremath{sim}1000 K, whereas ${mathit{R}}_{1}$${(}^{1}$H) shows no such increase at any temperature. This behavior of ${mathit{R}}_{1}$${(}^{1}$H) contrasts with that in the bcc V-H, etc., solid solutions where anomalous relaxation occurs below ensuremath{sim}1000 K, and in all investigated metal dihydride phases, M${mathrm{H}}_{2mathrm{ensuremath{-}}mathit{x}}$. The anomalous ${mathit{R}}_{1}$${(}^{1}$H) behavior in ensuremath{alpha}-${mathrm{VH}}_{mathit{x}}$, ensuremath{alpha}-${mathrm{NbH}}_{mathit{x}}$, etc., may be understood in terms of fast spin relaxation in the ${mathrm{H}}_{2}$ gas in equilibrium with the solid, mediated by fast gas-solid exchange of hydrogen. However, in the present systems, ensuremath{alpha}-${mathrm{ScH}}_{mathit{x}}$, ensuremath{alpha}-${mathrm{YH}}_{mathit{x}}$, etc., the ${mathrm{H}}_{2}$ gas pressure in equilibrium with the hcp systems is extremely low, resulting in negligible ${mathrm{H}}_{2}$ concentration in the gas phase, and consequently a negligible contribution to ${mathit{R}}_{1}$${(}^{1}$H). In contrast, some of the present measurements indicate that the ${mathit{R}}_{1}$${(}^{45}$Sc) anomaly does result from the hydrogen content of the metal, but the mechanism remains unexplained." @default.
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- W1975769642 date "1995-02-01" @default.
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- W1975769642 title "Normal and anomalous nuclear spin-lattice relaxation at high temperatures in Sc-H(D), Y-H, and Lu-H solid solutions" @default.
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- W1975769642 doi "https://doi.org/10.1103/physrevb.51.3503" @default.
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