Multifunctional Behavior of Fe-Doped Titanate-Based High-Entropy Perovskite Oxides
Abstract
High-entropy oxides have gain attention recently due to their flexibilities in formation of single-phase materials containing multiple cations, which may lead to promising properties. In this investigation, (Na0.2Bi0.2Ba0.2Sr0.2Ca0.2)TiO3 compound persisting perovskite structure is selected to further study effect of Fe substitution in Ti sublattice. Compounds prepared by solid state reaction technique exhibit single-phase cubic perovskite structure when doping with Fe < 0.5 mol. Change in lattice parameter and local structure can be observed by laboratory XRD and Raman spectrometer. Evolution of microstructure can be clearly seen. Grain size increases when small concentration of Fe is doped, however, it decreases when doped at higher concentration. Substitution of Ti by Fe, as acceptor doping, affects dielectric properties significantly. Slight decrease of dielectric permittivity at room temperature and increase in dielectric loss at high temperature are revealed as doping concentration increases. High-field dielectric response transforms from the slim and linear dielectric behavior of undoped sample to the more lossy dielectric behavior of the doped samples. M-H behavior of calcined powders exhibit similar characteristic to superparamagnetism when doped at higher concentration than 0.1 mol. Further investigation of magnetism is needed. Thus, based on this study, this compound shows promising multifunctionality where both dielectric and magnetic behavior coexists.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 22, 2023
- Accession Number
- AD1209573
Entities
People
- Natthaphon Raengthon
Organizations
- Chulalongkorn University