A single-crystal neutron diffraction study of RbTiOAsO4

A rubidium titanyl arsenate single-crystal has been studied by neutron diffraction (λ = 1.207 A). The polished sample used was 5 × 3 × 2 mm and was cut from a crystal made by top-seeded solution growth. The crystal showed severe extinction. It was, however, possible to obtain a structural model with well defined oxy­gen sites and reasonable anisotropic displacement parameters.