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TPD-TG-MS study of carbonate calcium hydroxyapatite particles
A Yasukawa1, K Kandori, T Ishikawa
1School of Chemistry, Osaka University of Education, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582, Japan.
Calcified Tissue International
|January 11, 2003
Summary
This study reveals how water (H2O) and carbon dioxide (CO2) release from calcium hydroxyapatite. Higher carbonate content in the material leads to greater H2O and CO2 release during heating.
Area of Science:
- Materials Science
- Geochemistry
- Solid State Chemistry
Background:
- Calcium hydroxyapatite is a key biomaterial and mineral component.
- Carbonate substitution influences its thermal decomposition behavior.
- Understanding H2O and CO2 evolution is crucial for materials characterization.
Purpose of the Study:
- To investigate the release mechanisms of H2O and CO2 from carbonate-substituted calcium hydroxyapatite.
- To correlate carbonate content with gas evolution during thermal treatment.
Main Methods:
- Simultaneous analysis using temperature-programmed desorption, mass spectroscopy, and thermogravimetry (TPD-MS-TG).
- Controlled heating of calcium hydroxyapatite samples with varying carbonate ion concentrations (0.1-10.1 mass%).
Main Results:
- Two distinct desorption peaks for H2O and CO2 were observed below 600°C (adsorbed species) and above 700°C (crystal lattice release).
- Increased carbonate ion content directly correlated with higher weight loss observed in TPD-TG curves, indicating enhanced gas evolution.
Conclusions:
- Carbonate ions significantly impact the thermal decomposition pathways of calcium hydroxyapatite.
- The study provides insights into the fate of H2O and CO2 during the thermal processing of carbonate-containing apatites.
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