Abstract
•Co0.7Fe0.3(MoO4) thin film was prepared using chemical technique “spray”.•From Rietveld refinement we found that our layer is monoclinic structure with no other impurities.•The physical properties of states were carried out using different characterisation techniques.
This work deals with the synthesis of cobalt iron molybdenum oxide thin films deposited on the glass substrates by the spray pyrolysis technique at 460 °C. First, the structural properties of the prepared samples were analyzed by X-ray diffraction (XRD) and Rietveld refinement techniques showed a monoclinic structure of Co0.7Fe0.3(MoO4). The surface topography performed by the scanning electron microscopy (SEM) shows spherical grains disturbed randomly with sizes varying from 2 to 5 μm. Second, the optical parameters, such as absorption, band gap and refractive index were studied using both the spectrophotometer UV-VIS-NIR and the ellipsometry spectroscopic. In the same line, it is noted that the optical study shows a direct transition with a band gap equal to 1.77 eV and a normal dispersion of refractive index determined by Cauchy formalism. In addition, the photoluminescence (PL) measurements exhibit emission in the visible region with a weak band located around 420 nm and a strong one assigned at 486 nm. Finally, AC conductivity is well described by Jonscher’s law and it is verified that the frequency exponent s has values ≤ 1 and the value of s decrease with increasing temperature, suggesting hopping conduction mechanism. The activation energy Ea equal to 1.13 eV.