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Since, hydroxyapatite (HAP) crystal system is hexagonal and its crystalline size in the longitudinal directions of various (a,b,c) axes, which are depending on the thickness of the laminated plateshaped HAP crystals. Hence, by applying of Scherrer’s equation D100 = Kλ / (β cos ) we calculated their crystallite size as perpendicular to the (100) plane as well as to comparing the thickness of synthesized needle or laminated thin plate shaped HAP nanocrystals of CALPHOS or CONTROL and SUC or Suc-20 samples under hydrothermal condition via organically modified apatite based octacalcium phosphate (OCP) at 180°C for 3h. The pH of solution adjusted to 5.5 with incorporating dicarboxylate or succinate ions having Ca/P molar ratio is expected to be 1.56±0.02, where the morphology of OCP are retained. During incorporating of succinate ions in OCP crystals, the hydrogen phosphate (HPO4 ) ions in the hydrated layers of OCP are being substituted by succinate ions. These organically modified OCP which generated to HAP with unique nanocrystallite structure have been characterized by using of SEM, FTIR and X-ray diffraction analysis.

Introductory of Scherrer’s Equation in Laminated Plate-Shaped Hexagonal Hydroxyapatite Nanocrystals System