High-Entropy Relaxor Oxide Ceramics for Electrical Energy Storage

• Applicant: Professor Dr. Vladimir V. Shvartsman
• Subject Area: Synthesis and Properties of Functional Materials
• Term: since 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 567099395

The aim of the project is to investigate the potential of niobate-based high entropy oxides (HEOs) for energy storage applications. In particular, we will explore the formation of relaxor or antiferroelectric relaxor behavior in HEO compounds with both isovalent and heterovalent substitutions. The following compounds will be prepared: (Na,Ag,Li,K,Cs)NbO3, (Na,Ag,Li,K,Me2+)(Nb0.8Ti0.2)O3 and (Na,Ag,Li,K,Bi)(Nb0.8Me3+0.2)O3. We will study the effect of cation combination on the structure and macroscopic dielectric properties to determine the influence of tolerance factor, electronegativity and polarizability of substitution elements on the stabilization of the high entropy state. For ceramics with the compositions showing the best energy storage density and efficiency, the dielectric breakdown strength will be improved by optimizing the microstructure.

• DFG Programme: Research Grants
• Co-Investigator: Professor Dr. Doru Constantin Lupascu