Bioinorganic Preparation of Hydroxyapatite and Rare Earth Substituted Hydroxyapatite for Biomaterials Applications

Figure 4

Images of FESEM (a) HA with particle size, (b) HA, (c) Nd-Ce/HA with particle size, and (d) Nd-Ce/HA.

(a)

(b)

(c)

(d)