Abstract
Type A carbonate apatite powder, in which carbonate ion was completely substituted for the hydroxyl site, was synthesized by heating a low crystalline and stoichiometric hydroxyapatite powder under flow of a dry carbon dioxide gas at 1000 °C for 24 h. Its chemical formula was determined to be Ca 10(PO4)6(CO3) 0.93±0.06 from compositional and infrared spectroscopic analyses. The X-ray and neutron diffraction patterns of type A carbonate apatite showed the extra diffractions attributed to monoclinic symmetry with the space group Pb. The thermal expansion property of the type A carbonate apatite was determined from neutron powder diffraction data at 25, 200, 400 and 500 °C. The extra diffractions attributed to the monoclinic symmetry were not diminished at the high temperatures. The thermal lattice expansion coefficients were, for the first time, calculated to be αa = 13.1 × 10 -6 °C-1, αb = 34.9 × 10 -6 °C-1 and αc = 8.1 × 10 -6 °C-1 by using a Le Bail refinement.
Original language | English |
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Pages (from-to) | 171-175 |
Number of pages | 5 |
Journal | Materials Science and Engineering B: Solid-State Materials for Advanced Technology |
Volume | 173 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - Mar 19 2010 |
Externally published | Yes |
Keywords
- Neutron powder diffraction
- Thermal expansion
- Type A carbonate apatite
- Whole powder fitting method
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering