A new multichannel collimator optimized for Paris–Edinburgh press geometry and a two-dimensional imaging plate detector have been developed at beamline ID30 at the European Synchrotron Radiation Facility. This system allows in situ collection of high quality x-ray diffraction data of liquids and amorphous materials simultaneously at high pressure and high temperature conditions. Excellent improvements in terms of signal to background ratio have been obtained. In order to illustrate the potential of this new device, preliminary results on liquid tin and lead under high pressure are presented.

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The phase diagram of samarium has been studied by in situ synchrotron X-ray diffraction with a diamond anvil cell (DAC) up to temperatures of 800 K and up to pressures of 27 GPa. Equilibrium lines between the structures dhcp, fcc and distorted fcc were defined and a triple point was located at 11.3 GPa and 345 K. A close examination of diffraction spectra has shown that the distorted fcc phase could not be represented by a rhombohedral crystal system inside its whole domain of stability. The experimental P-V-T data were fitted to a thermal-pressure model and the values for bulk modulus and thermal expansivity were obtained.[samarium, DAC, high pressure, high temperature, X-ray diffraction, phase diagram]

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