title: A new strontium borophosphate, Sr6BP5O20, from synchrotron powder data.
abstract: Strontium borophosphate, Sr6BP5O20, was prepared by a solution synthesis method. The crystal structure was solved ab initio from synchrotron powder data without preliminary knowledge of the chemical formula. The compound crystallizes in space group -4c2. Sr atoms occupy sites coordinated by eight or nine O atoms, and the anionic layer consists of BO4 and PO4 tetrahedra. The eightfold-coordinated Sr atom lies at a site with twofold symmetry, while one P atom and the B atom are located on special positions of site symmetry -4.
authors.affiliation: Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 790-784, South Korea. sns@postech.ac.kr
authors.forename: Namsoo
authors.initials: N
authors.lastname: Shin
authors.forename: Jinyoung
authors.initials: J
authors.lastname: Kim
authors.forename: Docheon
authors.initials: D
authors.lastname: Ahn
authors.forename: Kee Sun
authors.initials: KS
authors.lastname: Sohn