TY - JOUR
T1 - Reactions of wollastonite and xonotlite with NH4H2PO4 and H3PO4
AU - Miyake, Michihiro
AU - Komarneni, Sridhar
AU - Roy, Rustum
N1 - Funding Information:
Acknowledgements.ThisworkwassupportedbytheDepartmentofEnergythroughthe Division ofMaterials Sciences, Office ofBasic Energy Sciences under Grant No. DE- FG02-85ER45204.
PY - 1987
Y1 - 1987
N2 - The reactions of wollastonite, CaSiO3 and xonotlite,Ca6Si6O17(OH)2 with NH4H2PO4 and H3PO4 have been investigated to determine whether silicophosphates can be synthesized topotactically. Hydroxyapatites were easily obtained from the reaction of the phosphate sources with xonotlite and wollastonite. The crystallinity of the hydroxyapatites increased with a decrease in the concentration of NH4H2PO4 and H3PO4 solution and an increase in temperature. Scanning electron microscopy showed that the morphology of the hydroxyapatite obtained was different from those of wollastonite and xonotlite. The chain structures of the SiO4 tetrahedra in wollastonite and xonotlite, however, were broken down by the attack of the PO4“ ions, and products such as hydroxyapatite, brushite and orthophosphate were produced. Hydroxyapatite was found to be the stable product above pH ~ 4.0 when xonotlite and wollastonite reacted with the above phosphate sources. The low-temperature transformation of calcium silicates to hydroxyapatites may find applications in the production of prosthetic implants.
AB - The reactions of wollastonite, CaSiO3 and xonotlite,Ca6Si6O17(OH)2 with NH4H2PO4 and H3PO4 have been investigated to determine whether silicophosphates can be synthesized topotactically. Hydroxyapatites were easily obtained from the reaction of the phosphate sources with xonotlite and wollastonite. The crystallinity of the hydroxyapatites increased with a decrease in the concentration of NH4H2PO4 and H3PO4 solution and an increase in temperature. Scanning electron microscopy showed that the morphology of the hydroxyapatite obtained was different from those of wollastonite and xonotlite. The chain structures of the SiO4 tetrahedra in wollastonite and xonotlite, however, were broken down by the attack of the PO4“ ions, and products such as hydroxyapatite, brushite and orthophosphate were produced. Hydroxyapatite was found to be the stable product above pH ~ 4.0 when xonotlite and wollastonite reacted with the above phosphate sources. The low-temperature transformation of calcium silicates to hydroxyapatites may find applications in the production of prosthetic implants.
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U2 - 10.1524/zkri.1987.179.1-4.383
DO - 10.1524/zkri.1987.179.1-4.383
M3 - Article
AN - SCOPUS:0011346404
SN - 1433-7266
VL - 179
SP - 383
EP - 393
JO - Zeitschrift fur Kristallographie - New Crystal Structures
JF - Zeitschrift fur Kristallographie - New Crystal Structures
IS - 1-4
ER -