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is particularly interesting since crystalline ZrW2O8 shows isotropic negative thermal expansion (NTE)[2] and NTE and PIA are believed to be theoretically linked[3]. Total scattering, an extension of the powder diffraction method is an extremely powerful tool for studying this type of phenomena. The unique combination of Bragg and diffuse scattering can be used to determine both the average structure and the short-range fluctuations from this average within a single experiment. In this way a single experimental technique can bridge the gap between amorphous and crystalline structures. However, obtaining high quality total scattering data from a sample contained within a pressure cell is a considerable challenge. Here I will present an RMCProfile[4] study of the pressure induced amorphisation in ZrW2O8 [5,6] using neutron and x-ray total scattering. I will also discuss the current and future developments on the high pressure beamline at ISIS (PEARL/HiPr) to improve the quality of neutron total scattering data at high pressures. [1] S. Kohara et al, Appl. Phys. Lett. 89, 201910 (2006). [2] J. S. O. Evans et al, Acta Crystallogr. Sect. B 55, 333 (1999). [3] R. J. Speedy, J. Phys. Condens. Matter 8, 10 907 (1996). [4] M G Tucker et al, J. Phys.-Condes. Matter 19 335218 (2007) [5] D A Keen et al, Phys. Rev. Lett. 98 art. no. 225501 (2007) [6] M G Tucker et al, Phys. Rev. Lett. 95 art. no. 255501 (2005)

Structural transition in amorphous sulfur compressed up to 100 GPa