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Calcium Hydroxyapatite, Ca10(PO4)6(OH)2
Categories: Ceramic; Oxide; Wood and Natural Products

Material Notes: Calcium hydroxyapatite is a natural constituent of teeth and bone, along with other calcium-phosphate ceramic (CPC) materials. Synthetic hydroxyapatite is used as an active bioceramic for teeth and bone replacement. Ionic substitution is common and plays a large role in the structure and properties of hydroxyapatites.

Key Words: Ca10(PO4)6(OH)2
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Physical PropertiesMetricEnglishComments
Density 3.05 - 3.15 g/cc0.110 - 0.114 lb/in³
 3.219 g/cc0.1163 lb/in³Calculated (for zero porosity)
Porosity 0.10 - 3.0 %0.10 - 3.0 %
a Lattice Constant 9.432 Å9.432 Å
c Lattice Constant 6.881 Å6.881 Å
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength, Ultimate 38.0 - 48.0 MPa5510 - 6960 psi
Modulus of Elasticity 7.00 - 13.0 GPa1020 - 1890 ksi
Flexural Strength 100 - 120 MPa14500 - 17400 psi
Compressive Strength 350 - 450 MPa50800 - 65300 psi
Poissons Ratio 0.270.27
Shear Modulus 2.76 - 5.12 GPa400 - 743 ksiCalculated
 
Descriptive Properties
Unit CellHexagonal

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