For high-pressure neutron experiments using total scattering diffractometer NOVA

Hattori, Takanori   ; Katayama, Yoshinori; Machida, Akihiko; Otomo, Toshiya*; Suzuya, Kentaro

To reveal the hydrogen position and its effect on the physical properties of materials under pressure, we constructed the highpressure system to conduct neutron diffraction at total scattering spectrometer, NOVA. It consists of a Paris-Edingburgh press (VX4, 230 tonf max.load), the adjustment stages, an oil pressure unit and a flange with several feedthroughs. By using this system, we can obtain the diffraction data at pressures up to c.a. 20 GPa over wide Q-range of 1-40 A with resolution of Q/Q=0.6%, which enables us to determine the hydrogen position of the materials in the real-space resolution of 0.16 A.