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Characterization of Iron, Manganese, and Copper Synthetic Hydroxyapatites by Electron Paramagnetic Resonance Spectroscopy

^a National Research Council, NASA Ames Research Center, Moffett Field, CA 94035
^b Dep. of Physics and Astronomy, Georgia State Univ., Atlanta, GA 30303
^c Dep. of Chemistry, Texas A&M Univ., College Station, TX 77843
^d Dep. of Soil and Crop Sciences, Texas A&M Univ., College Station, TX 77843
^e NASA Johnson Space Center, Houston TX 77058

View larger version (23K): [in a new window]   Fig. 1. X-band spectra (298 K) of Fe12-synthetic hydroxyapatite (SHA) and Fe12-SHA treated with DTPA and of Fe25-SHA and Fe25-SHA treated with DTPA. Dashed lines indicates where the derivative of the absorption curve is zero.

View larger version (25K): [in a new window]   Fig. 2. X-band spectra (298 K) Mn0.5-, Mn3-, and Mn11-synthetic hydroxyapatite (SHA) and Mn0.5-, Mn3-, and Mn11-SHA treated with DTPA. The components of the Mn0.5 and Mn3-SHA spectra marked A indicate a low concentration of another Mn phase. Dashed lines represent where the derivative of the absorption curve is zero. Spectral intensities between samples were scaled for ease of comparison while spectral intensities within samples are similarly scaled. The Mn3-SHA material is not marked DTPA and Untreated because the difference between the DTPA spectra and untreated spectra was difficult to separate.

View larger version (23K): [in a new window]   Fig. 3. X-band spectra (298K) of Mn0.5-, Mn3-, and Mn11-synthetic hydroxyapatite (SHA) that were all treated with DTPA. The Mn0.5-SHA simulated spectrum is also presented. Spectral intensities were scaled for ease of comparison.

View larger version (25K): [in a new window]   Fig. 4. Q-band spectra (245K) of Mn0.5-synthetic hydroxyapatite (SHA) along with its corresponding simulated spectra.

View larger version (29K): [in a new window]   Fig. 5. X-band spectra (100K) of Cu0.1-, Cu3-, and Cu12-synthetic hydroxyapatite (SHA) and Cu0.1-, Cu3-, and Cu12-SHA treated with DTPA. The dashed lines represent where the derivative of the absorption curve equals zero. Spectral intensities between samples were scaled for ease of comparison. Spectral intensities within samples are similarly scaled.

View larger version (24K): [in a new window]   Fig. 6. Q-band spectra (70K) of Cu3-synthetic hydroxyapatite treated with DTPA. Inset graph is expansion of the gz(a) and gz(b) region along with their corresponding simulated spectra.

View larger version (23K): [in a new window]   Fig. 7. X-band spectra (100K) of Cu3-synthetic hydroxyapatite (SHA) and Cu3-SHA treated with DTPA. Simulated spectra for the gz(a) and gz(b) regions are presented.