Title Origin of relaxor behavior in barium-titanate-based lead-free perovskites /
Authors Veerapandiyan, Vignaswaran ; Popov, Maxim N ; Mayer, Florian ; Spitaler, Juergen ; Svirskas, Šarūnas ; Kalendra, Vidmantas ; Lins, Jonas ; Canu, Giovanna ; Buscaglia, Maria Teresa ; Pasciak, Marek ; Banys, Jūras ; Groszewicz, Pedro B ; Buscaglia, Vincenzo ; Hlinka, Jiri ; Deluca, Marco
DOI 10.1002/aelm.202100812
Full Text Download
Is Part of Advanced electronic materials.. Hoboken : Wiley-Blackwell. 2022, vol. 8, no. 2, art. no. 2100812, p. [1-11].. ISSN 2199-160X
Keywords [eng] barium titanate ; density functional theory ; dielectric spectroscopy ; nuclear magnetic resonance ; Raman spectroscopy ; relaxors
Abstract [eng] 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.
Published Hoboken : Wiley-Blackwell
Type Journal article
Language English
Publication date 2022
CC license CC license description