Results and discussion Structure of FHA targets The XRD

3. Results and discussion
3.1. Structure of FHA targets
The XRD pattern of the FHA target (Fig. 1a) was typical of a crystalline apatite phase. The unit cell parameters determined from the XRD pattern refinement were a = 0.93906 nm and c = 0.68843 nm, with a unit cell volume of V = 0.60708 nm3. These lattice parameters were lower than those Tegobuvir of HA (a = b = 0.94166 nm and c = 0.68745 nm, V = 0.60958 nm3) [42], but higher than those of fluorapatite (FA; a = b = 0.93666 nm, c = 0.68839 nm, V = 0.60395 nm3) [43]. This result reinforced the hypothesis that F− was substituted for OH− in the apatite structure.
Fig. 1. (a) XRD (λ = 0.1377 nm) patterns and (b) FTIR spectrum of FHA targets sintered at 1100 °C for 2 h.Figure optionsDownload full-size imageDownload high-quality image (175 K)Download as PowerPoint slide