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J Dent Res 31(3): 371-382, 1952
© 1952 International and American Associations for Dental Research
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CRYSTALLOGRAPHIC INVESTIGATION OF TRICALCIUM PHOSPHATE HYDRATE

AARON S. POSNER 1 and SAMUEL R. STEPHENSON 1

1 National Bureau of Standards, Washington, D. C.

1. Crystals of so-called tricalcium phosphate hydrate were enlarged in a hydrothermal bomb from an average length of 500 angstrom units to about 3 µ without changing their Ca:PO4 ratio, density, refractive index, and the spacings of their x-ray pattern.

2. The x-ray diffraction powder patterns of tricalcium phosphate hydrate and hydroxy-apatite were found to be quite similar.

3. The differences between hydroxy-apatite and tricalcium phosphate hydrate insofar as density, index of refraction, and results of ignition at 900° C. are concerned can possibly be explained by postulating a 6 per cent phosphate ion inclusion in the entrapped surfaces of the hydroxy apatite crystal.

4. We suggest that a possible formula for tricalcium phosphate-hydrate is Cal0 (PO4)6 (OH)2 occluded 0.67 H3 PO4.

Submitted on January 9, 1952






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