oksidijohtimille

Oksidijohtimille refers to materials that exhibit electrical conductivity primarily through the movement of oxygen vacancies or other oxygen-related defects. These materials are a subset of solid electrolytes or mixed ionic-electronic conductors, where both ionic (typically oxygen ions) and electronic charge carriers are present. The conductivity of such materials is highly dependent on temperature, oxygen partial pressure, and the presence of dopants.

Common examples of oxides that can function as oxidijohtimille include perovskite oxides like Yttria-stabilized Zirconia (YSZ) and Gadolinium-doped Ceria (GDC). In YSZ, oxygen vacancies are created by doping zirconia with yttria, allowing for the diffusion of oxygen ions. In GDC, doping ceria with gadolinium similarly introduces oxygen vacancies. The electronic conductivity component in these materials often arises from the presence of transition metal ions within the oxide lattice, which can undergo changes in oxidation state.

The electrical properties of oxidijohtimille make them suitable for various electrochemical applications. They are critically important in solid oxide fuel cells (SOFCs) as both the electrolyte and electrode materials. In SOFCs, they facilitate the transport of oxygen ions from the cathode to the anode, where they react with fuel to produce electricity. Other applications include oxygen sensors, where their sensitivity to oxygen partial pressure is exploited, and in electrochemical reactors for oxidation reactions. The careful design and synthesis of these materials are crucial for optimizing their performance in these demanding environments.