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MnO2 doping stabilized antiferroelectric P phase and underlying physical mechanism in NaNbO3-SrTiO3 lead-free ceramics.
- Source :
-
Journal of the European Ceramic Society . Feb2024, Vol. 44 Issue 2, p882-890. 9p. - Publication Year :
- 2024
-
Abstract
- The incorporation of a few amount of MnO 2 into 0.88NaNbO 3 -0.12SrTiO 3 lead-free ceramics was found to effectively stabilize the antiferroelectric orthorhombic P phase before its transition into antiferroelectric orthorhombic R phase, consequently featuring completely reversible electric field-induced antiferroelectric-ferroelectric phase transition. Not only reproducible double polarization hysteresis loops but also repeated sprout-like strain-field curves ensure great application potentials in large-displacement lead-free actuators owing to both large repeatedly-utilized strains of ∼0.33% and low driving field of ∼11 kV/mm. Combined results of XPS, Raman spectroscopy and dielectric properties indicate that the stabilized antiferroelectric P phase was closely related to the reduced B-site cation polarizability and oxygen vacancy concentration, while a slight change in antiferrodistortive degree would discourage the P-R phase transition. These results indicate that ionic doping is an alternative method to alter the antiferroelectric P phase stability of NaNbO 3 -based lead-free ceramics by synergistically considering the influencing factors of phase and crystal structure stability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 44
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 173372301
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2023.09.021