title: A new rubidium beryllium borate, RbBe4(BO3)3.
abstract: Single crystals of a new rubidium beryllium borate, RbBe4(BO3)3, have been obtained by spontaneous nucleation from a high-temperature melt. This new orthorhombic (Pnma) structure type contains [Be2BO4]- rings, made of two BeO4 tetrahedra and one BO3 triangle, which constitute the basic structural units. The m plane runs through the B and one of the O atoms and intersects the ring. These rings form chains in the a direction, which are connected in the b and c directions to form zeolite-type cages in which the Rb+ cations are located, at sites of m symmetry.
authors.affiliation: Beijing Centre for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Wen
authors.forename: R-K
authors.initials: RK
authors.lastname: Li
authors.forename: C-T
authors.initials: CT
authors.lastname: Chen