Hydroxyapapites M10(PO4)6(OH)2 (MHAP), where M is an alkaline earth metal, colored by incorporation
of copper ions substituting protons, were discovered recently [1]. Now this kind of apatite-type materials
can be used as inorganic pigments. Until now blue (BaHAP), violet (SrHAP) and wine-red (CaHAP) colors
were achieved by the copper ions introduction [2]. The task of the present work was to study possibility
of further M-ion substitution to affect the color and shift it toward the red–orange tint. Polycrystalline
hydroxyapatites Ca10xLix+yCuz(PO4)6O2H2yzr (Ca–LiHAP) were synthesized by solid state reaction at
1150 C (ceramic method) and studied by X-ray powder diffraction (XRD), infrared absorption and diffuse-
reflectance spectroscopy. Refinement of the X-ray diffraction patterns by the Rietveld method shows
that CaHAP unit cell parameters are a little bigger, than Ca–LiHAP ones. Small difference between unit cell
parameters could be caused by two ways of the Li+ ions introduction: (1) at the Ca2+ sites (Ca–Li substitution);
(2) into hexagonal channels (H–Li substitution). The Li ions doping changes the color of the copper
doped CaHAP from wine-red to pink and red.
Hydroxyapapites M10(PO4)6(OH)2 (MHAP), where M is an alkaline earth metal, colored by incorporationof copper ions substituting protons, were discovered recently [1]. Now this kind of apatite-type materialscan be used as inorganic pigments. Until now blue (BaHAP), violet (SrHAP) and wine-red (CaHAP) colorswere achieved by the copper ions introduction [2]. The task of the present work was to study possibilityof further M-ion substitution to affect the color and shift it toward the red–orange tint. Polycrystallinehydroxyapatites Ca10xLix+yCuz(PO4)6O2H2yzr (Ca–LiHAP) were synthesized by solid state reaction at1150 C (ceramic method) and studied by X-ray powder diffraction (XRD), infrared absorption and diffuse-reflectance spectroscopy. Refinement of the X-ray diffraction patterns by the Rietveld method showsthat CaHAP unit cell parameters are a little bigger, than Ca–LiHAP ones. Small difference between unit cellparameters could be caused by two ways of the Li+ ions introduction: (1) at the Ca2+ sites (Ca–Li substitution);(2) into hexagonal channels (H–Li substitution). The Li ions doping changes the color of the copperdoped CaHAP from wine-red to pink and red.
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