title: Li2AlB5O10.
abstract: A new compound, dilithium aluminium pentaborate, Li(2)AlB(5)O(10), has been synthesized by solid-state reaction and its structure determined by single-crystal X-ray diffraction. This compound is composed of [B(5)O(10)](5-) groups linked by AlO(4) tetrahedra. The [B(5)O(10)](5-) group consists of two hexagonal B-O rings perpendicular to each other connected by tetracoordinated boron. All the B-O rings in this structure can be divided into two groups, with one group approximately parallel and the other perpendicular to the c axis.
authors.affiliation: Institute of Physics and Centre for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080, People's Republic of China.
authors.forename: M
authors.initials: M
authors.lastname: He
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: X
authors.initials: X
authors.lastname: Chen
authors.forename: Y
authors.initials: Y
authors.lastname: Xu
authors.forename: T
authors.initials: T
authors.lastname: Xu