Abstract
Single crystals of the strontium phosphate orthoborate metaborate, Sr 10[(PO 4) 5.5(BO 4) 0.5](BO 2), were grown from the melt and investigated by X-ray diffraction (space group P 3 ¯ , No. 147; a=9.7973(8) Å, c=7.3056(8) Å, V=607.29(10) Å 3, Z=1). The crystal structure is closely related to apatite and contains linear metaborate groups, [BO 2] − (point group D ∞h , B–O=1.284(11) Å) taking positions within the channels running along the three-fold inversion axis. Strontium sites are found to be fully occupied while [PO 4] 3− tetrahedra are partially replaced by [BO 4] 5− groups.
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