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Additional info for Handbook on the Physics and Chemistry of Rare Earths, Volume 42
10 Y. Uwatoko et al. no crystal structure change and no volume anomaly at room temperature under high pressure at least up to 10 GPa. , 1986). Figure 7 shows the pressure dependence of a, b, and c at 77 K. , 1986). The value of a is almost independent of pressure, which is similar to room temperature data. 5 GPa. 5 GPa at 77 K. 5 GPa. From Figure 7, kb at 77 K is larger than kc. 5 GPa. The bulk moduli were roughly estimated to be B (hpp) ¼ 200 GPa and B(lpp) ¼ 100 GPa. 5 GPa. , 1985). , 1988a).
The similar diffraction experiment was also done up to 30 GPa by using helium gas and the synchrotron X-ray source and shown in Figure 21. In this experiment, the discontinuous change around 6 GPa was also not observed. However, the same anomaly around 17 GPa was confirmed again. 7 0 20 10 30 P (GPa) FIGURE 21 Summary of pressure dependence of volume of CeAl2 and LaAl2. The solid lines are the result of fitting to Eq. (1) (Miyagawa, 2008). pressure medium (Takemura, 1999). In the case of CeAl2, however, the anomaly around 17 GPa is observed in all of the compression curves obtained by using both the 4:1 methanol:ethanol mixture and helium gas, which was used to generate the ideal hydrostatic condition.
As mentioned above, CeAl2 is well known to show a pressure-induced continuous valence transition, which is considered to still exist around 17 GPa. But since the compression curve of CeAl2 above 17 GPa becomes similar to that of LaAl2, the valence transition is expected to be suppressed or becomes negligible above 17 GPa. AuIn2 is another typical example of a compound that shows pressure-induced TPT. , 1998) that AuIn2 shows anomalies in the pressure Thermal and Electronic Properties of Rare Earth Compounds at High Pressure 27 120 r (mW cm) 100 80 60 40 CeAl2 20 RT 0 5 10 15 P (GPa) 20 25 FIGURE 22 Pressure dependence of the electrical resistivity of CeAl2 up to 23 GPa at room temperature (Miyagawa, 2008).