Single Crystal Growth and Structure Analysis of AB-Type Carbonate Apatite

Yasushi Suetsugu; Toshiyuki Ikoma; Masanori Kikuchi; M. Tanaka

doi:10.4028/www.scientific.net/KEM.288-289.525

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Single Crystal Growth and Structure Analysis of AB-Type Carbonate Apatite

Abstract:

Single crystals of AB-type carbonate apatite were grown by a CaCO3-Na2CO3 flux method under high pressure of Ar gas. The crystals obtained were hexagonal prismatic elongated along the c-axis with the length of 2mm and the diameter of 0.3mm at a maximum. Chemical formula was Ca8.8Na1.2[(PO4)4.8(CO3)1.2]CO3 and the space group was hexagonal P6 with cell parameters a = 0.9379(2)nm, c = 0.6935(1)nm. The detailed crystal structure determined with a reliability factor Rw = 0.047 indicated that the triangular plane of carbonate ion occupying B-site was slanted off the crystallographic mirror plane and the angle of the carbonate triangle with the mirror plane varied depending on Na-substitution of adjacent Ca sites whilst the A-site carbonate ion was parallel to the c-axis.