Effect of bismuth (Bi 3+ ) substitution on structural, optical, dielectric and magnetic nature of La 2 CoMnO 6 double pe
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Effect of bismuth (Bi3+) substitution on structural, optical, dielectric and magnetic nature of La2CoMnO6 double perovskite Niketa Bajpai1, M. Saleem1,2,* 1 2
, and Ashutosh Mishra1
School of Physics, Vigyan Bhavan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India Govt. Autonomous (Model) Holkar Science College, Indore, M.P. 452001, India
Received: 25 April 2020
ABSTRACT
Accepted: 25 August 2020
Double perovskite oxide materials represented as A2BB0 O6 have attracted a great attention due to their diverse electrical, magnetic and structural properties. In this report, we discuss synthesis, structural, optical, magnetic and electric nature of the double perovskite manganites of the type La2-xBixCoMnO6 [x = 0.0, 0.1, 0.2]. These solid-state reaction route products with x = 0.0, 0.1 were found monoclinic structured (P 1 21 / n 1) confirmed from the X-ray diffraction data analysis, whereas the sample with x = 0.2 has acquired a new structure confirmed to be cubic (Fm-3 m) with another phase corresponding to Bi2O3 crystallized in monoclinic structure acquiring space groups P 1 21 / c 1. The results of XRD data analysis were re-verified via Rietveld refinement. The phase formation was further verified via Raman and FTIR spectral studies. The samples were investigated for composition and morphology also. The optical bandgap was determined (& 1 eV) from the diffuse reflectance UV–Vis spectra. Temperature-dependent dielectric constant and dielectric loss was investigated in the temperature range of 320–90 K at various constant values of applied ac field and the results were exceptionally good. Electrical (dc) resistivity exploiting four-probe technique with and without magnetic field infer the samples are semiconducting in nature. Room temperature magnetic measurement reveals the samples exhibit low magnetic moment which shows linear behaviour in both forward and reverse field values.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Materials of the formula A2BB0 O6 (where A is rare, B and B0 are transition metals) are termed as double perovskite oxides materials. In the recent times, they
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https://doi.org/10.1007/s10854-020-04348-w
attracted researchers due to their interesting composition-dependent physical properties and ferromagnetic insulating behaviour near room temperature, driven by Coulomb assisted spin-orbit coupling, interesting magnetic properties associated to cation
J Mater Sci: Mater Electron
ordering and large magnetoresistance driven by spin polarized transport across the grains and grain boundaries [1–4]. The focus of research community is to explore these double perovskite materials in terms of the origin of their properties. At relatively high temperatures, these double perovskite manganite materials inherit multifunctional properties which makes them potential candidates for spintronic applications. The centre of research interest for these materials is to improve their magnetic (d
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