抄録
Crystal structures of (BaxCa1-x)2SiO4 were investigated by laboratory X-ray powder diffraction (CuKα1). With x = 0.65, the initial structural model with eleven independent atoms in the unit cell was determined using direct methods, and it was further modified to a split-atom model, in which the two types of Ba/Ca atoms and two types of SiO4 tetrahedra were, respectively, positionally and orientationally disordered. The crystal structure is trigonal (space group P-3m1, Z = 4) with lattice dimensions a = 0.57505(1) nm, c = 1.46706(2) nm and V = 0.42014(1) nm3. This compound is most probably homeotypic to glaserite.
