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

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Carvalho, TT (Author) Other; Manjunath, B (Author) Other; Perez de la Cruz, JP (Author) Other; Amaral, VS (Author) Other; Fernandes, JRA (Author) Other; Almeida, A (Author) REIT; Agostinho Moreira, JA (Author) FCUP; Vilarinho, R (Author) Other; Tavares, PB (Author) Other

Journal

Title: Journal of Alloys and Compounds

Vol. 835

ISSN: 0925-8388

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-00S-3AJ

DOI: 10.1016/j.jallcom.2020.155404

Abstract (EN): 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<y<0.1. These improved physical properties are a consequence of the absence of secondary phases and the breaking of the spiral cycloid spin structure. In particular, the compositions within 0.18 <= x <= 0.30 and <y<0.05 with IM orthorhombic structure exhibit the lowest conductivity and highest remnant magnetization. The outcome of this work suggests an alternative route to enhance multiferroic properties of BiFe03, with simultaneous La (0.10 <= x <= 0.30) and moderate Mn (0.01<y<0.1) substitution.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10