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The thermal expansion coefficients of DyScO3 and GdScO3 have been determined earlier from 25 to 1000¡ãC using XRD [26]. The calculated volumetric thermal expansion coefficients of DyScO3 and GdScO3 are V,DSO = 2.42 x 10-5 K-1 and V, GSO = 3.07 x 10-5 K-1, respectively. We have seen in the previous section that the frequency of all Raman modes decreases to a good approximation linearly with temperature from room temperature to 1200 ¡ãC. Such a linear temperature dependence makes the Raman modes themselves in principle suitable for the determination of the thermal expansion, assuming that changes in the volume V and thus in bond distancesd, induce changes in force constants and thus in vibrational frequencies. The Gr¨¹neisen model assumes that the Gr¨¹neisen constant correlates the temperature dependence of vibrational frequencies with the unit cell volume. At constant pressure the Gr¨¹neisen constant is defined by where is the frequency of a vibrational mode, V the unit cell volume and V the volumetric thermal expansion given by (2) As a consequence, when the temperature dependence of vibrational modes is known, the Gr¨¹neisen parameter can be determined from the known thermal expansion (or vice-versa). The so-calculated Gr¨¹neisen parameters are given in Table 1 under the assumption that the same volumetric thermal expansion V can be used for every mode. As expected the Gr¨¹neisen parameters vary significantly from one mode to the other. |
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ll921(½ð±Ò+50, ·ÒëEPI+1): 2011-03-25 06:54:00
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