Solubility of apatite is highly addressed in mineralogical and material studies.
Heating is one of the major processes in apatite industry. In this study, synthesized
hydroxylapatite (HAp), geological fluorapatite (FAp), and bone bioapatite (BAp) were heated
at various temperature (100-900 oC) for analyses. The mineralogy and solubility of the three
apatites were analyzed by XRD, ATR-IR, and ICP. Release of Ca and P in water for BAp
reach the maximum when heated at 200 oC, i.e., 0.215 mmol/L for Ca and 0.106 mmol/L for
P. The value is higher than the maximum values (heated at 900 oC) of solubility for HAp and
FAp. The heating temperature at 600 oC is a re-crystallization point for all the three types of
apatites. Especially, the crystallinity of BAp is significantly elevated at >600 oC. Phase of
geological FAp is relatively stable during heating up to 900 oC. Phase of =-TCP is present
when heating HAp at 800 to 900 oC. In addition, BAp is transformed to the resemblance of
HAp. However, no =-TCP was detected for BAp during heating between 800 to 900 oC,
which is probably due to its Ca-deficiency.
materials and fertilizer.
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Article Solvothermal synthesis of hydroxyapatite with various morpho...
https://www.sciencedirect.com/science/article/pii/S0167577X17301490
Article Hydroxyapatite Hierarchically Nanostructured Porous Hollow M...
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