“…Diffraction maxima corresponding to the hexagonal crystalline structure of hydroxyapatite were identified at 2θ values of 26.4 • , 28.7 • , 29.4 • , 32.2 • , 33.9 • , 34.1, 35.6 • , 39.9 • , 47.6 • , 49.9 • , and 53.6 • . The corresponding diffraction planes are evidenced in Figure 1.The intense doublet, attributed to the presence of (211) and (112) planes, confirmed the synthesis of stoichiometric crystalline HAp[72], according to the JCPDS09-0432 file and previous results from the literature[73,74].The presence of large, overlapped reflection peaks indicated the reduced crystallinity of the synthesized material, a result expected due to the absence of additional thermal treatments[75,76]. However, the formation of high purity HAp powder was confirmed, as no secondary phases were noticed.The SEM measurements (Figure2) showed the presence of HAp aggregates, consisting in needle-like nanosized individual particles (width of ~10 nm, length between 10−100 nm).…”