EVERGREEN AMR 06 - Calcium Hydroxyapatite (3 pages)

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Calcium Hydroxyapatite



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Calcium Hydroxyapatite

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Pages:
3
School:
Evergreen State College
Course:
Amr 06 - Atoms, Molecules & Reactions

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Calcium Hydroxyapatite Ca10 PO4 6 OH 2 Structure consists of calcium surrounded by phosphate and hydroxy groups A complete unit cell is not shown here instead you can see distinguishing features such as PO4 tetrahedra O H groups calcium The unit cell consists of two triangular prismatic subcells forming a rhombic prism with vertical sides There are two horizontal mirror planes one 1 4 of the way down and one 3 4 of the way down from the top In addition there is a center of inversion exactly in the center of each vertical face of each subcell we see a CaO9 substructure centered on Ca1 The three O1 atoms are above the Ca atom the three O2 atoms slightly twisted are below The three O3 atoms are slightly below the Ca1 atom in this view The six PO4 units of the unit cell three in each of the two triangular subcells are organized in sets of three in a pinwheel fashion around Ca1 They are attached via O2 and O3 in each case In this depiction there are two O3 atoms aligned vertically One is part of the enantiomeric CaO9 unit just above this one Along each of the three vertical faces of each triangular subcell there are two calcium atoms of another sort Ca2 each with seven O atoms nearby making a CaO7substructure



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