Abstract Scope |
High entropy oxides(HEOs)contain-five or more oxide components and form a single phase after processing. Doping HEOs with alkali metals, such as lithium and sodium, significantly-increases their electrical conductivity, indicating that -HEOs are promising for energy storage and battery applications. However, the mechanisms behind the reduction in charge transfer resistance, and the role of composition and microstructure, is not fully understood. Here we investigate the role of Na doping and microstructure on the electrical behavior of bulk sintered (Co,Cu,Mg,Ni,Zn)(1-x)Na(x)O. Activation energies obtained from impedance measurements at elevated temperatures were used to elucidate the primary mechanisms contributing to charge transport in the grain bulk and grain boundaries. Results demonstrate that highly doped samples exhibit easier transport at the grain boundaries. |