High entropy oxides are a special group of ceramic materials that are held in high interest due to their highly adjustable properties and their use in catalysis and energy storage. In this thesis, a high entropy oxide with the composition (Ni$_{0,2}$Mg$_{0,2}$Co$_{0,2}$Cu$_{0,2}$Zn$_{0,2}$)O with a halite crystal structure is synthesized using a solvent-deficient method. The product is characterized using powder x-ray diffraction and energy dispersive spectroscopy and is imaged using a scanning electron microscope. Aside from the final product, the dried reaction mixture in an intermediate stage before the calcination has been evaluated using XRD. The target product is a homogenous one where all the reagents have fully combined into a single structure within the same crystal lattice. During the optimization of synthesis to produce a desirable product, the following parameters have been tested: milling time and speed (revolutions per minute), time and temperature of calcination. At a sufficiently high calcination temperature, such a product has been successfully created.
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