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Indexed XRD spectrum of pure (upper panel) and its SEM image (lower panel). Note the large grains and the melted grain boundaries.
(a) Semilog plots of vs for and for . Bold lines consist of small symbols representing dense data points obtained from the automatic measuring system. Circles and triangles mark data points obtained from manual measurements; and squares mark extrapolated values obtained from pulsed measurements. Dotted lines are fitted lines representing activated transport. (b) vs for and for . The solid line represents a linear fit of S vs at the high temperatures.
(a) Log-log plots of vs for at various temperatures. The data for a sample at 80 K were added for comparison. Symbols represent pulsed measurements and solid lines–dc measurements. Note the large hysteresis in the dc plots. Inset: the data for 90 K replotted on linear scale. (b) vs for at various temperatures. Solid lines represent lines fitted to the data points.
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