  The development of CdMgO ternary alloy with a single cubic phase is
challenging but meaningful work for technological advancement. In this work, we
have grown a series of Cd1-xMgxO ternary random alloys with various Mg
concentrations (x = 0, 30, 32, 45, and 55%) on quartz substrate by
plasma-assisted molecular beam epitaxy (PA-MBE) technique. The structural
investigations of alloys were performed using the X-ray diffraction (XRD)
technique. The decreases in average crystallite size and lattice parameters
were observed with an increase in Mg content in the alloys. XRD analysis
confirms a single cubic phase is obtained for alloy compositions. The elemental
and morphological studies were carried out using energy dispersive x-ray (EDX)
spectroscopy and atomic force microscope (AFM) technique, respectively. The
optical investigation was carried out using UV-Vis spectroscopy. The optical
bandgaps were estimated using the Tauc relation and it was varied from 2.34 eV
to 3.47 eV by varying the Mg content from zero to 55% in the alloys. The Urbach
energy increases from 112 meV to 350 meV which suggests a more disordered
localized state with an increase in Mg incorporation in the alloys.
