Print Email Facebook Twitter Origin of Relaxor Behavior in Barium-Titanate-Based Lead-Free Perovskites Title Origin of Relaxor Behavior in Barium-Titanate-Based Lead-Free Perovskites Author Veerapandiyan, Vignaswaran (Materials Center Leoben GmbH) Popov, Maxim N. (Materials Center Leoben GmbH) Mayer, Florian (Materials Center Leoben GmbH) Spitaler, Jürgen (Materials Center Leoben GmbH) Svirskas, Sarunas (Vilnius University) Kalendra, Vidmantas (Vilnius University) Lins, Jonas (Technische Universität Darmstadt) Canu, Giovanna (Institute of Condensed Matter Chemistry and Technologies for Energy National Research Council of Italy) Braga Groszewicz, P. (TU Delft RST/Storage of Electrochemical Energy; Technische Universität Darmstadt) Date 2021 Abstract It is well known that disordered relaxor ferroelectrics exhibit local polar correlations. The origin of localized fields that disrupt long-range polar order for different substitution types, however, is unclear. Currently, it is known that substituents of the same valence as Ti4+ at the B-site of barium titanate lattice produce random disruption of Ti-O-Ti chains that induces relaxor behavior. On the other hand, investigating lattice disruption and relaxor behavior resulting from substituents of different valence at the B-site is more complex due to the simultaneous occurrence of charge imbalances and displacements of the substituent cation. The existence of an effective charge mediated mechanism for relaxor behavior appearing at low (<10%) substituent contents in heterovalent modified barium titanate ceramics is presented in this work. These results will add credits to the current understanding of relaxor behavior in chemically modified ferroelectric materials and also acknowledge the critical role of defects (such as cation vacancies) in lattice disruption, paving the way for chemistry-based materials design in the field of dielectric and energy storage applications. Subject barium titanatedensity functional theorydielectric spectroscopynuclear magnetic resonanceRaman spectroscopyrelaxors To reference this document use: http://resolver.tudelft.nl/uuid:9c3f5ae0-9869-4410-aeff-60c88056a389 DOI https://doi.org/10.1002/aelm.202100812 Source Advanced Electronic Materials, 8 (2) Part of collection Institutional Repository Document type journal article Rights © 2021 Vignaswaran Veerapandiyan, Maxim N. Popov, Florian Mayer, Jürgen Spitaler, Sarunas Svirskas, Vidmantas Kalendra, Jonas Lins, Giovanna Canu, P. Braga Groszewicz, More Authors Files PDF aelm.202100812.pdf 2.33 MB Close viewer /islandora/object/uuid:9c3f5ae0-9869-4410-aeff-60c88056a389/datastream/OBJ/view