Recent developments using the Paris-Edinburgh cell for neutron diffraction at high pressure and high temperature and some applications

We describe a recently developed technique for high pressure high temperature neutron scattering up to 7 GPa and 2000 K with a novel radiographic method to determine the temperature under pressure. We demonstrate the technique by some recent results on hydrous minerals (namely brucite and ice VII) and on spine] MgAl2O4, where neutrons still have an unchallenged advantage over X-rays. Future scientific opportunities are outlined.