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Sr[(PO){sub 5.5}(BO){sub 0.5}](BO): Growth and crystal structure of a strontium phosphate orthoborate metaborate closely related to the apatite-type crystal structure

Journal of Solid State Chemistry (Impact Factor: 2.04). 01/2010; 183(3):658-661. DOI: 10.1016/j.jssc.2009.12.026
Source: OAI

ABSTRACT Single crystals of the strontium phosphate orthoborate metaborate, Sr[(PO){sub 5.5}(BO){sub 0.5}](BO), were grown from the melt and investigated by X-ray diffraction (space group P3-bar, No. 147; a=9.7973(8) A, c=7.3056(8) A, V=607.29(10) A³, Z=1). The crystal structure is closely related to apatite and contains linear metaborate groups, [BO] (point group D{sub i}nfinity{sub h}, B-O=1.284(11) A) taking positions within the channels running along the three-fold inversion axis. Strontium sites are found to be fully occupied while [PO]³ tetrahedra are partially replaced by [BO] groups. - Graphical abstract: Single crystals of the strontium phosphate orthoborate metaborate, Sr[(PO){sub 5.5}(BO){sub 0.5}](BO), were grown from the melt and structurally characterized. The crystal structure is closely related to apatite and contains uncommon linear [BO] metaborate groups taking positions within the channels running along the three-fold inversion axis.

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