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Thermal conductivity of perovskite crystals. In , selected data points are also shown as open circles. The thermal conductivity of amorphous silica (Ref. 15) is also shown as a dashed line.
Thermal conductivity of and plotted in linear scales. For , the data taken with the heat flow along the plane and axis of the tetragonal structure, respectively, are shown. For , the measurements for the cooling and heating directions were taken on two separate occasions. In , the data taken with the heat flow parallel to the orthorhombic axis are shown.
The heat capacity divided by for PMN, , and . The inset shows the data in vs . The lines show the fit to the data, as discussed in the text.
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