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- W2084220797 startingPage "13998" @default.
- W2084220797 abstract "Recent investigations of the compound NaSn (1:1) have indicated that both fast conduction of ${mathrm{Na}}^{+}$ cations and rapid reorientations of (${mathrm{Sn}}_{4}$${)}^{4mathrm{ensuremath{-}}}$ anions are present in the high-temperature solid phase, ensuremath{alpha}-NaSn. We have used $^{23}mathrm{Na}$ and $^{119}mathrm{Sn}$ nuclear magnetic resonance to separately monitor the motions of Na and Sn in the low-temperature ordered solid phase, ensuremath{beta}-NaSn, where the correlation times of the motions are much longer. The ${mathrm{Na}}^{+}$ motions are evident in ${mathit{T}}_{1}$, ${mathit{T}}_{1mathrm{ensuremath{rho}}}$, ${mathit{T}}_{2}$, and ${mathit{T}}_{2}^{mathrm{*}}$ (linewidth) $^{23}mathrm{Na}$ data at magnetic fields of 8.0 and 2.0 T. The Na motions are described by a single time constant with thermal activation parameters ${mathit{E}}_{mathit{a}}$/${mathit{k}}_{mathit{B}}$=9700 K and ${mathrm{ensuremath{omega}}}_{mathit{D}}$(ensuremath{infty})=1.7ifmmodetimeselsetexttimesfi{}${10}^{14}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$. Sn motions are evident in ${mathit{T}}_{2}$, line shape, and stimulated echo data taken at 8.0 T. $^{119}mathrm{Sn}$ stimulated echo data unequivocally show the Sn motion to be reorientations of ${mathrm{Sn}}_{4}$ tetrahedra; any diffusion of Sn between tetrahedra is much slower. The combined ${mathit{T}}_{2}$ and stimulated echo data for $^{119}mathrm{Sn}$ demonstrate that the ${mathrm{Sn}}_{4}$ reorientations are thermally activated with ${mathit{E}}_{mathit{a}}$/${mathit{k}}_{mathit{B}}$=13 800 K and ${mathrm{ensuremath{omega}}}_{mathit{R}}$(ensuremath{infty})=2.3ifmmodetimeselsetexttimesfi{}${10}^{15}$ ${mathrm{s}}^{mathrm{ensuremath{-}}1}$. The temperature dependence of the $^{119}mathrm{Sn}$ ${mathit{T}}_{1}$ fits an activation energy of 7000 K; the Sn ${mathit{T}}_{1}$ is believed to be due to thermally activated charge carriers." @default.
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- W2084220797 date "1995-11-15" @default.
- W2084220797 modified "2023-09-27" @default.
- W2084220797 title "Atomic motions in an unusual molecular semiconductor: NaSn" @default.
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- W2084220797 doi "https://doi.org/10.1103/physrevb.52.13998" @default.
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