Perovskite-type oxides (ABO₃, B = transition metal) are promising materials for photovoltaics, catalysts, thermoelectrics, batteries, supercapacitors, and storage devices. Their distinctive property is the tunability of phase and chemical composition, microstructure and morphology, good chemical resistance, and high long-term stability, which can be realized by different synthesis approaches. On the other hand, making and maintaining devices requires knowledge of how certain materials behave under non-ambient conditions.

The project will clarify the tuned synthesis of La1-xCaxCo1-yMyO3-d (M= Ni, Cr, Fe, Mn) perovskites doped with low/high doping levels and their link to crystallographic and physico-chemical characteristics at non-ambient conditions, which are necessary fundamentals for their realization in devices. Namely, perovskites' mechanical characteristics, especially response to hydrostatic pressure and produced stress, affect device fabrication and durability.

Oxide perovskites will be synthesized (i) hydrothermal and glycine-nitrate gel comcombustion and (ii) high-energy ball milling, spray drying, and furnace calcination to obtain diverse morphologies and chemical structures, whewherease crystal strstructuresd phase stabilities will be chemically tuntuned doping with M. The effects of powder consolidation processes (i.e. additive manufacturing and thermal spraying) on the crystal structures of the phases and their specific thermoelectric, eleelectrocatalytic, chemocatalytic functionalities will be studied in detail.

In contrast to chemical pressure (i.e., doping), hydrostatic pressure is a clean tool to tune the structures of perovskites and their functionalities, leading to exotic features like bandgap narrowing, carrier-lifetime prolongation, photoluminescence intensity enhancement, ambient-memorized retainability, metallization, amorphization, and phase transitions.

In situ high-pressure X-ray diffraction, Raman and absorption spectroscopy, and electrical resistance studies above (up to 50 GPa) will improve the understanding of the underlying physics and structure-property correlations of prepared perovskites by revealing new features and functionalities.