Effect of Fe³⁺ Partial Substitution at Mn-Site on Electroresistance Behaviour in La_0.7Ba_0.3Mn_1-xFe_xO₃ (x = 0 and 0.02) Manganites

Abstract:

La_0.7Ba_0.3Mn_1-xFe_xO₃ (x = 0 and 0.02) were prepared by using solid state synthesis method to investigate the effect of Fe³⁺ substitution at Mn-site on electrical behaviour and structural properties. An analysis of X-ray diffraction, XRD data using refinement method shown both x = 0 and x = 0.02 samples were in single phased and crystallized in rhombohedral structural with Pnma space group. From ρ vs T curves shown resistivity decreased under increased of applied current of 10 mA to 20 mA for both samples in the temperature range of 20 K-300 K. The larger electroresistance, ER effect observed for x = 0.02 in temperature range of 20 K – 180 K compared to x = 0 sample is suggested due to the development of filamentary conduction path under increased of applied current. It is suggested that Fe substitution enhanced magnetic inhomogeneity which contribute to the growth of formation of conductive path under increased of applied current, lead to increase of ER effect. In the temperature range of 180 K – 300 K, the observed decreased in ER for Fe substituted sample (x = 0.02) is suggested due to the increased of scattering effect and reduction of available hopping site in metallic region and insulating region, respectively. Restriction in the movement of charge carrier had weakened the ER effect for Fe substituted sample. The observed ER effect indicates the compound has a potential for application such as for non-volatile memory elements.

• Periodical: Solid State Phenomena (Volume 317)
• Pages: 3-9
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.317.3
• Online since: May 2021
• Authors: Muhammad Suffian Sazali, Norazila Ibrahim*, Zakiah Mohamed, Rozilah Rajmi, Ahmad Kamal Yahya
• Keywords: Electroresistance, Magnetic Inhomogeneity, Manganite Material, Phase-Separation, Solid State Reaction

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