抄録
X-ray in-situ observation of PbI2 under high pressure and temperature up to 13 GPa and 600°C was conducted by means of MAX 90 system and synchrotron radiation. Two high pressure phases were newly found to appear at 10 GPa, 200°C (phase VII) and at 13 GPa, 600°C (phase VIII) respectively. The phase relation under pressure was drawn by combining the present data and those reported. In the course of releasing pressure, phase VIII was retained down nearly to 1 GPa and reverted directly to the ambient pressure phase on the complete release of pressure, while phase VII transformed to a metastable phase at 3 GPa. Obtained diffraction patterns of phase VII and VIII were indexed on the basis of monoclinic symmetry. Baddeleyite type structure is proposed for phase VII.
