Journal article
The structure of Na6Zn3(AsO4)4 · 3H2O and its relationship to the garnet and other Ia3d-derived structures
IE Grey, IC Madsen, DJ Jones, PW Smith
Journal of Solid State Chemistry | ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS | Published : 1989
Abstract
The hydrated sodium zinc arsenate, Na6Zn3(AsO4)4 · 3H2O, has cubic symmetry, space group P213, a = 12.243(3) Å, Z = 4. The structure was refined to wR(F2) = 0.028 using 548 independent reflections from a microtwinned crystal. Both zinc and arsenic atoms are tetrahedrally coordinated. The ZnO4 tetrahedra share all vertices with the basal vertices of the AsO4 tetrahedra to give a 3-D framework that is closely related to the [B7O12]3- framework of corner-linked BO4 and BO3 in boracite. The sodium atoms (CN = 6) and water molecules occupy [110] channels in the framework. The structural relationships with the garnet structure and related Ia3d-derived structures are discussed. © 1989.