Enhancement of resistivity and magnetization of Bi1-xLaxFe1-yMnyO3 ceramics by composition optimization

• Published in: Journal of alloys and compounds 2020-09, Vol.835, p.155404, Article 155404
• Main Authors: Carvalho, T.T., Manjunath, B., Pérez de la Cruz, J., Amaral, V.S., Fernandes, J.R.A., Almeida, A., Moreira, J Agostinho, Vilarinho, R., Tavares, P.B.
• Format: Article
• Language: English
• Subjects: BiFeO3; Bismuth compounds; Chemical co-substitution; Composition; Cycloids; Electrical resistivity; Ferromagnetism; Incommensurate modulated structure; Leakage current; Leakage currents; Magnetic measurements; Magnetic properties; Magnetism; Magnetization; Multiferroic; Optimization; Physical properties; Raman spectra; Room temperature; Satellite observation; Spin structure
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.155404

This work aims at studying the effect of La and Mn substituents on the structural, electrical and magnetic properties of Bi1-xLaxFe1-yMnyO3 (0≤x≤0.30; 0≤y≤0.20) at room temperature, in order to find out the optimal compositions that provide both high resistivity and remnant magnetization. The analysis of the XRD patterns and Raman spectra suggest a progressive transition from a rhombohedral for x0.20. Moreover, we observe satellite peaks associated with an incommensurate modulated (IM) orthorhombic structure for x≥0.15 with y = 0, and x = 0.20 with y = 0.10. We were able to achieve a decrease by several orders of magnitude of the leakage current density and the emergence of a weak ferromagnetic response in the range of compositions 0.10