the XRD results were examined. Figures 4
and 5 show, from some samples of RHA prepared at different conditions and nanosilica present, a broad peak at 2θ = 22° associated with amorphous silica. The lack of
sharp peaks indicates the absorbance of any ordered
crystalline structure, confirming the results from the
Powder X-ray diffractogram of the silica nanoparticles
is displayed in Fig. 3. It shows a broad and high intensity
peak at 2θ = 22° which indicate the amorphous nature of
the silica [18]. Absence of sharp peaks confirm the absence of ordered crystalline structure in the prepared RH-Silica nanoparticles.
The powder X-ray diffraction pattern of nanosilica is shown in Figure 1. A strong broad peak centered
at 22º (2θ) confirms the amorphous nature of silica which is supposed to be the characteristic of amorphous
SiO2. Due to thermochemical process, the crystalline particles transforms into amorphous silica which is
indicated by broad peak.