Enhanced dielectric, ferroelectric, and ferromagnetic properties of 0.7Bi1−xTmxFeO3–0.3BaTiO3 ceramics by Tm-induced structural modification. Issue 12 (15th June 2022)

• Record Type: Journal Article
• Authors: Zhang, Lujia; Li, Guannan; Gong, Xin; Tang, Jianfeng; Lu, Yuming
• Is Part Of: Ceramics international. Volume 48:Issue 12(2022)
• Page Start: 17760
• Page End: 17767
• Publication Date: 2022-06-15
• Subjects: BiFeO3–BaTiO3 -- Tm -- Dielectric properties -- Multiferroic properties; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.03.046
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, Tm-doped 0.7Bi1− x Tm x FeO3 –0.3BaTiO3 ( x = 0–0.05) ceramics have been fabricated using traditional solid-phase reactions and their structural, morphological, and dielectric as well as multiferroic properties are investigated. X-ray diffraction and Rietveld refinement indicated the formation of a Tm-modulated morphotropic phase boundary (MPB) from the rhombohedral ( R 3c) and tetragonal ( P 4mm) phases to a single P 4mm phase for Tm content of x = 0.02–0.03. Tm occupation of lattice sites is strongly suggested at both the A and B sites in the ABO3 -type perovskite structure, which is supported by the obtained Raman spectra, the calculated tolerance factor, and dielectric relaxation characteristics. With the Tm-induced aforementioned–structural modification, the dielectric constant, remnant polarization ( P r ), and remnant magnetization ( M r ) values indicate that the dielectric and multiferroic properties are greatly improved. The obtained maximum remnant polarization (2 P r = 35.28 μC/cm 2 ) and remnant magnetization (2 M r = 0.56 emu/g) are approximately two and seven times larger, respectively, than those of the sample without Tm substitution ( x = 0). With increasing the Tm content, the remnant polarization, and the remnant magnetization exhibit almost the same trends in variation, indicating the possible existence of a relatively strong magnetoelectric coupling effect. Our study may provide a substitution strategy (structural modification by substituting the same element into two different lattice sites) to efficiently enhance the dielectric and multiferroic properties of BiFeO3 –BaTiO3 -based ceramics.