Strontium titanate: From symmetry changes to functionality
Hartmut Stöcker, Juliane Hanzig, Matthias Zschornak, Erik Mehner, Sven Jachalke, Carsten Richter, Florian Hanzig, Falk Meutzner, Tilmann Leisegang and Dirk C. Meyer
Version of Record online: 22 SEP 2016 | DOI: 10.1002/crat.201600222
Pure strontium titanate exhibits a cubic perovskite-type structure, but many approaches to break this high degree of symmetry are accessible. Since oxygen vacancies are the most prominent and most mobile defect species in strontium titanate, they play a crucial role also for structural changes due to external influences. Possible functionalities range from tuning of permittivity and conductivity to field-induced structure changes, which lead to applications as solid-state battery or switchable pyroelectric.