3.2 XRD Analysis
Figure (5-a) shows the diffraction pattern of the synthesized samples.
The diffraction patterns of the synthesized samples contain
nanoparticles (NiFe2O4), amorphous
SiO2 particles and a metal-organic framework containing
copper (HKUST-1). These diffraction patterns are consistent with other
reports [43-45]. An increase in concentration
(NiFe2O4) and a decrease in silica
substrate concentration are clearly visible at peak 24 ° and sharpening
of peaks (NiFe2O4). According to
reports, the peaks observed in the range of 15-20 are related to the
presence of a metal-organic framework containing copper. Peaks in the
range of 30-40 are related to the presence of nickel ferrite in the
silica bed which confirms the existence of a metal-organic framework
containing copper (HKUST-1) and nanocomposites
(NiFe2O4). The main peaks of the
synthesized magnetic metal-organic nanocomposite frame include 16.05,
19.9, 42.24, 74.35, 28.37, 47.43, 57.53, 55.57, 72.62; that in all three
patterns, peaks related to MOF and nanoparticles
(NiFe2O4) are observed. Figure (d-5)
shows the pattern of nickel ferrite nanocomposites in silica substrate
and compared with the reference peaks of nickel ferrite (5-b) and silica
(5-c) nanoparticles [46,47]. This diffraction pattern showed that
the peaks include nickel ferrite index peaks with cubic spinel structure
Fd3m which represent the plate group (2 2 7) and silica lattice index
peaks which represent the plate group (2 2 0). These results showed that
the nanocomposite was synthesized correctly, and its pattern was
consistent with the existing reports [46-50].
The Scherer equation (Equation 2) was used to calculate the average
crystal size using the XRD model.