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Crystal growth and structure analysis of twin-free monoclinic hydroxyapatite

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Abstract

Single crystals of hydroxyapatite were grown by a flux method using Ca3(PO4)2 and Ca(OH)2 under 100 MPa of Ar gas. The crystals obtained had stoichiometric composition of Ca10(PO4)6(OH)2 and some of them were twin-free single crystals. From X-ray diffraction analyses, the space group was confirmed to be monoclinic P21/b with cell parameters a=0.9419(3) nm, b=1.8848(6) nm, c=0.6884(2) nm, and γ=119.98(2)°. The detailed crystal structure was determined with a reliability factor Rw=0.033; the O atoms of OH were located just on the 21 axis while the H atoms of OH occupied the positions a little deviated from the 21 axis. The origin of this structure was ascribed to the formation of hydrogen bonds between the H atoms of the OH ions and the specific O atoms of the PO4 ions.

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Authors and Affiliations

  1. Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan

    Yasushi Suetsugu & Junzo Tanaka

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  1. Yasushi Suetsugu
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  2. Junzo Tanaka
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Suetsugu, Y., Tanaka, J. Crystal growth and structure analysis of twin-free monoclinic hydroxyapatite. Journal of Materials Science: Materials in Medicine 13, 767–772 (2002). https://doi.org/10.1023/A:1016170924138

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