| Autor: |
Rabadjieva D; Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bontchev Str., Bl.11, 1113, Sofia, Bulgaria. didiarab@svr.igic.bas.bg, Tepavitcharova S, Gergulova R, Sezanova K, Titorenkova R, Petrov O, Dyulgerova E |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of materials science. Materials in medicine [J Mater Sci Mater Med] 2011 Oct; Vol. 22 (10), pp. 2187-96. Date of Electronic Publication: 2011 Aug 26. |
| DOI: |
10.1007/s10856-011-4415-3 |
| Abstrakt: |
Powders of magnesium-modified as well as zinc-modified calcium phosphates (Me-β-TCP and HA) with a (Ca(2+)+Mg(2+)+Zn(2+)+Na(+)+K(+))/P ratio of 1.3-1.4 and various Me(2+)/(Me(2+)+Ca(2+)) ratios (from 0.005 to 0.16) were prepared in biomimetic electrolyte systems at pH 8, mother liquid maturation and further syntering at 600-1000°C. Some differences in zinc and magnesium modifications have been prognosed on the basis of thermodynamic modeling of the studied systems and explained by the Mg(2+) and Zn(2+) ion chemical behaviour. The temperature as well as the degree of Zn(2+) and Mg(2+) ions substitutions were found to stabilize the β-TCP structure and this effect was more prononced for zinc. Thus, zinc-modified β-TCP powders consisting of idiomorphic crystals were obtained through sintering of Zn(2+) ion substituted calcium phosphates precursors at 800-1000°C. The Mg(2+) ion substitution leads to obtaining magnesium-modified β-TCP with spherical grains. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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