Attenuation correction for cubic-anvil high pressure cell for neutron diffraction study under pressure

Abe, Jun; Komatsu, Kazuki*; Arima, Hiroshi*; Hattori, Takanori   ; Sano, Asami   ; Arakawa, Masashi*; Kagi, Hiroyuki; Okuchi, Takuo*; Utsumi, Wataru

We have performed high-pressure neutron diffraction experiments using newly designed cubic-anvil high-pressure cell. Incident and diffracted neutron beams travel through high-pressure device, which causes attenuation of neutron. We have studied the method of attenuation correction and analyzed crystal structure using corrected neutron diffraction pattern. The total attenuation of the diffracted neutron beam is calculated by ray tracing. Neutron diffracted pattern of AlO in cubic-anvil high-pressure device have been measured and carried out the attenuation correction. Crystal structure was analyzed by the Rietveld method. Atomic coordinates and displacement parameters of AlO in cubic-anvil high-pressure device agreed with those obtained by using sample holder.