Figure 6
Samples of (a, b) HgI2 and (c, d) palladium dimethyl glyoxime uniaxially squeezed between DAC culets, with the stress increased from the left to right photographs. The colour changes in HgI2 mark phase III (to 0.4 GPa), phase IV (to 1.3 GPa), phase VI (to 7.6 GPa) and phase VII at the centre of the right photograph (Hostettler & Schwarzenbach, 2005). Continuous colour change occurs without structural phase transitions in palladium dimethyl glyoxime (Tkacz & Drickamer, 1986). The culet diameter (octagon contours close to the edge of the photographs) is 0.7 mm. |