Oxideperovskieten

Oxideperovskieten are a class of oxide-based perovskite materials that are often treated as a subgroup of the broader oxide perovskite family. The term is used in some sources to denote compounds with the general ABO3 framework, where A is a larger cation and B is a smaller transition-metal cation, coordinated by six oxygen atoms. Variants with oxygen vacancies or mixed A- and B-site occupancy expand the compositional space and tune properties.

In the ideal perovskite structure, BO6 octahedra form a three-dimensional network with A-site cations occupying interstitial sites. Distortions, octahedral tilts, and cation ordering can lead to cubic, tetragonal, or orthorhombic symmetry. Oxygen deficiencies (δ) create ionic defects that contribute to mixed ionic-electronic conductivity, important for energy and catalytic applications.

Synthesis and processing commonly involve solid-state reactions at high temperatures, sol-gel routes, or solution-based routes, followed by sintering. Thin films and epitaxial layers can be grown by methods such as pulsed laser deposition or metal-organic chemical vapor deposition to achieve controlled crystallinity and strain.

Properties of oxideperovskieten are diverse and highly tunable through chemical composition and processing. They can exhibit ferroelectric, piezoelectric, dielectric, catalytic, and ionic-conducting behavior, with band gaps and redox properties adjustable via B-site chemistry. Applications span solid oxide fuel cells, sensors, catalysis, and electronic devices.

Research on oxideperovskieten focuses on dopant strategies, defect engineering, and stable, scalable synthesis. Ongoing challenges include controlling phase stability, mitigating oxygen loss at high temperatures, and integrating materials into devices.