A role of B-site cation on structural and transport properties of La2BMnO6 (B= Cr, Fe, Co, Ni, Cu, Zn) double perovskites

Javed Ahmad; Mozammal Iqbal; Jamshaid Alam Khan; Syed Hamad Bukhari; Muhammad Tufiq Jamil; Umair Nissar

doi:10.1117/12.2575147

27 August 2020 A role of B-site cation on structural and transport properties of La₂BMnO₆ (B= Cr, Fe, Co, Ni, Cu, Zn) double perovskites

Javed Ahmad, Mozammal Iqbal, Jamshaid Alam Khan, Syed Hamad Bukhari, Muhammad Tufiq Jamil, Umair Nissar

Author Affiliations +

Proceedings Volume 11561, First iiScience International Conference 2020; 115610A (2020) https://doi.org/10.1117/12.2575147
Event: First iiScience International Conference: Light Generation, Sensing & Energy Sources, 2020, Multan, Pakistan

Abstract

Structural, dielectric and electrical properties of polycrystalline double perovskite oxides La₂BMnO₆ (Where B= Cr, Fe, Co, Ni, Cu, Zn) were prepared by auto combustion sol-gel method. The characterization of samples via X-ray reflects single phase in present series. X-ray diffraction pattern of all samples reveal monoclinic structure with space group P2₁/n except Cu which shows orthorhombic symmetry with Pbnm space group. The crystallite size (𝐷) was calculated by Scherrer formula and Williamson hall analysis. Frequency dependent dielectric properties measured at various temperatures. Dielectric constant (ε′) and loss tan δ decreases with frequency. AC conductivity (σ_ac) increases as function of frequency shows semiconducting nature. I-V characteristic curve shows increase in current with rise in temperature. The DC resistivity (ρ_𝑑𝑐) shows negative temperature coefficient behaviour. It is confirmed that results in case of copper and chromium fitted well by small polaron hopping (SPH) model and for cobalt variable range hopping (VRH) of small polaron was observed whereas for Zn, Ni and Fe follows variable range hopping model.

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Javed Ahmad, Mozammal Iqbal, Jamshaid Alam Khan, Syed Hamad Bukhari, Muhammad Tufiq Jamil, and Umair Nissar "A role of B-site cation on structural and transport properties of La₂BMnO₆ (B= Cr, Fe, Co, Ni, Cu, Zn) double perovskites", Proc. SPIE 11561, First iiScience International Conference 2020, 115610A (27 August 2020); https://doi.org/10.1117/12.2575147

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