Abstract Scope |
Entropy-stabilized oxides (ESO) consist of five or more oxide components that form a random solid solution structure after processing. ESOs have garnered significant attention due to their interesting functional properties and expanded compositional space. For example, (Cu,Co,Mg,Ni,Zn)O shows promise for fuel cell and batteries components. Here we explore the role of processing, microstructure, and secondary phases on the electrical behavior of bulk (Co,Cu,Mg,Ni,Zn)O. Samples were consolidated using conventional sintering and heat treated at a range of temperatures and times to control the phase state. Temperature dependent impedance spectroscopy was used to investigate the role of microstructure on the electrical conductivity and activation energy for electrical transport. Electron and atomic force microscopy techniques were used to characterize the microstructure and tie it to the electrical behavior. Results show that processing and microstructure significantly influence the electrical behavior in (Co,Cu,Mg,Ni,Zn)O. Mechanisms governing the contribution of microstructure to electrical behavior will be discussed. |