ホウ素含有アパタイト単結晶のフラックス合成と結晶構造

概要

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Single crystals of boron-containing apatite (BAP) were grown by standard flux growth technique with excess B_2O_3 as flux. A mixture with the composition 35CaO-5P_2O_5-60B_2O_3(wt%) was heated at 1200℃ for 10 hours and then cooled at a rate of 8.3℃/h. Hexagonal prismatic crystals (0.3mm×0.3mm×11mm) were obtained. The chemical composition of 'sBAP was expressed as a solid solution in the system Ca_<10> (PO_4)_BO_4- Ca_<9.5> (PO_4)_6BO_2. BAP with the composition Ca_<9.64> (P_<5.73>B_<0.27>O_<24>) (BO_2)_<0.73> is trigonal space group P3^^- with a=9.456 (1), c=6.905 (1) Å and Z=1 The structure was refined to R = 0.050 and R_<10>=0.044 for 1257 independent reflections. The structure is apatitic in character but the B atom at (001/2 forms a linear O-B-O group.
社団法人日本セラミックス協会の論文
1988-03-01