Antimony mercury oxide (SbHgO₄, CAS 20720-76-7) is an inorganic compound composed of antimony, mercury, and oxygen. It is a solid material that is typically handled with caution due to the presence of toxic mercury. This compound is primarily investigated as a functional material precursor. In the field of materials chemistry, it serves as a precursor for synthesizing functionalized catalysts, particularly for applications in heterogeneous catalysis where specific metal oxide compositions are required. Additionally, its unique composition makes it a candidate material for research in energy storage, where it is explored as an electrode functional additive or a component in advanced battery systems to modify electrode properties. Due to the high toxicity of mercury, its handling requires strict safety protocols to prevent exposure and environmental contamination. Its commercial applications are highly specialized and limited to specific research and development contexts in advanced material science.