| Autor: |
Brown WE; Research Associate, American Dental Association, National Bureau of Standards, Washington, D.C. 20234., Epstein EF; National Institute of Dental Research, National Institutes of Health, Bethesda, Md. (present address. Department of Chemistry, University of Wisconsin, Madison, Wis.). |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of research of the National Bureau of Standards. Section A, Physics and chemistry [J Res Natl Bur Stand A Phys Chem] 1965 Nov-Dec; Vol. 69A (6), pp. 547-551. |
| DOI: |
10.6028/jres.069A.059 |
| Abstrakt: |
Tetracalcium phosphate, Ca 4 O(PO 4 )2, has a monoclinic modification with the parameters a= 11.99, b = 9.48, and c = 6.97 A, α = 90.8°, z = 4, and space group P2 1 or P2 1 /m. From a comparison with the work of Trömel and Zaminer, it is concluded that this salt has monoclinic and orthorhombic modifications with the most probable space groups being P2 1 and P2 1 22 1 , respectively. The results support the view that tetracalcium phosphate has a layer-type structural relationship to hydroxyapatite, Ca 5 (OH)(PO 4 ) 3 . This would account, in part, for variations in the compositions of apatitic materials in which the ratio Ca/P is greater than 10/6, and it suggests that tetracalcium phosphate may be present in the mineral of tooth and bone. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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