Structural and Electrical Transport Properties of La_0.67Ba_0.33Mn_1-yTi_yO₃ Ceramics

Abstract:

The structural and electrical transport properties of La0.67Ba0.33Mn1-yTiyO3 manganite, with y = 0.00, 0.05, 0.10, 0.15, 0.20, 0.40 and 0.60, prepared using the solid state reaction technique have been investigated. The X-ray diffraction spectra of the Ti substituted samples showed the formation of single phase compound with Pm3m cubic structure except for the y = 0.60 sample, which showed La2Ti2O7 phase formation. Lattice parameter increased with Ti content and then decreased at y = 0.60. Resistivity versus temperature study showed that only samples with y = 0.05 and 0.10 exhibited both metallic and semiconductor-like behaviour with the metal-insulator transition temperature, Tp of 167 K and 43 K, respectively. At higher Ti concentration the samples only showed the semiconducting behaviour. At T < Tp the resistivity curves followed the ρ = ρo1 + ρ1T2 relation and for T > Tp, the curves can be fitted with the nearest neighbour hopping (NNH), variable range hopping (VRH) or/and the small polaron hopping (SPH) models.

• Periodical: Advanced Materials Research (Volume 501)
• Pages: 86-90
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.501.86
• Online since: April 2012
• Authors: Zainuddin Zalita, Shaari Abdul Halim
• Keywords: Electrical Transport, Hopping, Manganite

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