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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.
