abstract
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 x < 0.15 with y = 0, and x = 0 with y <= 0.20 to an orthorhombic structure for x + y>0.20. 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< x <= 0.3 and 0
keywords
MORPHOTROPIC PHASE-BOUNDARY; DOPED BIFEO3 CERAMICS; MULTIFERROIC PROPERTIES; PIEZOELECTRIC PROPERTIES; THERMODYNAMIC STABILITY; ROOM-TEMPERATURE; LA; TRANSITION; SYSTEM; DIAGRAM
subject category
Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
authors
Carvalho, TT; Manjunath, B; de la Cruz, JP; Amaral, VS; Fernandes, JRA; Almeida, A; Moreira, JA; Vilarinho, R; Tavares, PB
Groups
acknowledgements
This work was developed in the scope of the projects, Norte-070124-FEDER-000070, I3N (PEst-C/CTM/LA0025/2013e14), PTDC/FIS/NAN/0533/2012, NORTE-01/0145/FEDER/028538/2017, CERN/FIS/PAR/0005/2017, CQVR/QUI/UI0616/2015 and UIDB/00616/2020, grant SFRH/BD/41331/2007 financed by national funds through the FCT/MEC, CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT ref. UID/CTM/50011/2013), financed by national funds though the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.