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- W2066977107 abstract "Measurements of the proton-spin--lattice relaxation rate ${mathit{R}}_{1}$ are reported for zirconium dihydrides, ${mathrm{ZrH}}_{mathit{x}}$ (1.58ensuremath{le}xensuremath{le}1.98), with emphasis on the behavior of ${mathit{R}}_{1}$ at high temperatures (to 1300 K). An anomalously sharp increase in ${mathit{R}}_{1}$ is found at all hydrogen concentrations at temperatures above ensuremath{sim}900 K. At the onset temperature ${mathit{T}}_{mathit{c}}$ for anomalous ${mathit{R}}_{1}$ behavior, defined as that of the intermediate ${mathit{R}}_{1}$ minimum, the hydrogen hopping rate ${ensuremath{nu}}_{mathit{c}}$ensuremath{simeq}${10}^{9}$--${10}^{10}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$, decreasing with increasing hydrogen concentration x. The anomalous behavior depends only weakly on resonance frequency and shows no correlation with the pronounced peak in the electronic density of states at xensuremath{simeq}1.80. No differences were found in the behavior of pure and impurity-doped (Cr, Mn, Fe) samples. The anomalous contribution to ${mathit{R}}_{1}$ is described by ${mathit{R}}_{1mathit{x}}$=A' exp(-U/${mathit{k}}_{mathit{B}}$T), with Uensuremath{simeq}0.4--1.0 eV/atom." @default.
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- W2066977107 date "1991-12-01" @default.
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- W2066977107 title "Anomalous proton-spin–lattice relaxation at high temperatures in zirconium dihydrides" @default.
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- W2066977107 doi "https://doi.org/10.1103/physrevb.44.12353" @default.
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