Publication date: 10th April 2024
Oxygen vacancies play crucial roles in a wide range of interesting and important phenomena such as superconductivity, magnetoresistance, resistance switching, piezoelectricity, and oxide ion conductivity.
Presence of oxygen vacancies and oxide ion conductivity may play positive or negative roles for practical applications. For example, for electrochemical applications such as solid oxide fuel/ electrolysis cells and oxygen separation membranes, creations of oxygen vacancies and high oxide ion conductivity are essential to enhance device performances. For dielectric applications such as multilayer ceramic capacitors, however, oxygen vacancies can become mobile at relatively high temperatures and/or under high electric fields, leading to resistance degradation and fatal capacitor failures.
This raises an important fundamental question of how to enhance or suppress migration of oxygen vacancies in perovskite oxides. Two examples will be discussed in this presentation:
1) How to achieve high oxide ion conductivity, high structural stability, and high CO2 tolerance in perovskite oxides by tuning bulk and surface chemistry.
2) How to suppress simultaneously both oxide ion conductivity and electronic conductivity in perovskite oxide BaTiO3 for high-temperature, high-voltage multilayer ceramic capacitors for next-generation high power electronics applications.
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