Abstract Scope |
High entropy oxides (HEO), consist of five or more oxide components that form a random solid solution structure after processing. HEOs have garnered significant attention in the ceramic materials community due to their interesting functional properties and expanded compositional space. For example, (Cu,Co,Mg,Ni,Zn)O shows promise in applications related to energy storage such as batteries and solid oxide fuel cell components. In this work we explore the role of composition, stoichiometry, processing, and microstructure, including control of secondary phases, on the electrical behavior of bulk (Cu,Co,Mg,Ni,Zn)O. Samples were consolidated using conventional sintering of solid-state synthesized powders. Electron microscopy and energy dispersive X-ray spectroscopy (EDS) were used to characterize the microstructure, and electrochemical impedance spectroscopy (EIS) was used to evaluate the electrical behavior. Results show significant variability in behavior depending on material composition and process variables. Mechanisms governing these variations will be discussed. |