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- Title
Effect of pH level and calcination on the production of calcium phosphates by acidic route of wet precipitation .
- Authors
Neves, J. G.; Navarro da Rocha, D.; Lopes, C. C.; Prado da Silva, M. H.; Sinhoreti, M. A. C.; Correr-Sobrinho, L.; Fraga, M. A. A.; Correr, A. B.
- Abstract
Multiphasic calcium phosphate powders were synthesized by the acidic route, using lactic acid as a chelating agent that allows the production of a stable and rich solution of calcium and phosphate ions at room temperature. After pH adjusting, without varying the concentrations of precursor solution, XRD and FTIR analyses showed different CaP phases before and after heat treatment at 1000 °C. At pH 5, brushite plate-like particles were produced, while at higher pH levels (7 to 12) nano-hydroxyapatite particles were formed. After the calcination process, partial and total decomposition of hydroxyapatite in the β-TCP phase was explained by XRF analysis due to the calcium-deficient hydroxyapatite of synthesized samples at pH 7 and 10. This work presents an important method to synthesize any desired CaP phase compositions by varying the pH level and subsequently performing heat treatment, which has a direct effect on morphology, crystallinity, and formation of different CaP powders.
- Subjects
PH effect; CALCIUM phosphate; CALCIUM ions; CHELATING agents; LACTIC acid; HEAT treatment
- Publication
Ceramica, 2021, Vol 67, Issue 382, p236
- ISSN
0366-6913
- Publication type
Article
- DOI
10.1590/0366-69132021673822965