Using Polyphosphate, Calcium mixture and water, causes pure single apatite crystal by hydrothermal synthesis.
Growth of Hydroxyapatite Huge Single Crystals by Hydrothermal decomposition of PolyPhosphate
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posted 04 Oct, 2018
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Put Orthophosphate into the chemical resistant Beaker, e.x PTFE, keep it 210degrees Celsius at least 2 weeks.
PTFE High pressure reactor vessel, 25ml volume, put 0.5g of upper polyphosphate. add 0.6-0.7g Calcium oxide then mix them. add 12-14ml water, Tighten the vessel and put into electro Furness 200-240C. Keep it for 5-7days.
You can find mm size Hydroxyapatite crystals.
2 weeks or more for prepare polyphosphate.
1 week for Hydroxyapatite synthetization.
1.Perloff, A., & POSNER, A. S. (1956). Preparation of Pure Hydroxyapatite Crystals. Science (New York, N.Y.), 124(3222), 583–4.