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Raman spectra as a function of grain size indicating that the material’s crystal structure remained tetragonal. All the lines are distinctive of the tetragonal phase with no indication of monoclinic phase whose most distinctive lines are a strong doublet at 181 and .
Thermal conductivity as a function of temperature for tetragonal zirconia stabilized with 3 m/o for samples aged at the times indicated at to increase the average grain size. The error bars are smaller than the size of the symbols. The lines through the data points are the best fits to the empirical equation: , where is temperature and , , and are fitting parameters.
Intrinsic thermal conductivity (top) and grain boundary Kapitza resistance (bottom) derived from the measured thermal conductivity in Fig. 1 using the macroscopic heat conduction model.
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