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Influence of Al doping in LaCoO3 on structural, electrical and magnetic properties

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Abstract

We report investigations on polycrystalline LaCo1−x Al x O3 (x = 0–0.9) bulk samples. The solid state synthesized samples showed a coexistence of rhombohedral and monoclinic phases in the intermediate concentrations (0.2 ≤ x ≤ 0.5) and pure rhombohedral phase otherwise. The observed effect of Al doping on dc transport has been analysed on the basis of small polaron hopping mechanism. The magnetisation results presented give evidence of weak ferromagnetism and anomalous temperature dependence of coercivity which we associate to the canting of the localised high-spin Co(III) and anti-symmetric exchange interactions at low temperatures.

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Acknowledgements

The authors thank Prof. R.C. Budhani, DNPL for his encouragement and support. The authors greatly acknowledge Mr. Naval, Mr. Jai Tawale for the P-XRD and SEM micrographs, respectively. Aswin acknowledges CSIR for the financial support. AD acknowledges IFCPAR (4704-1) for the funding.

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Authors and Affiliations

  1. National Physical Laboratory (CSIR), Dr. K. S. Krishnan Marg, New Delhi, 110 012, India

    Aswin V., Pramod Kumar, Pooja Singh, Anurag Gupta & Anjana Dogra

  2. UGC-DAE CSR, Mumbai Center, R-5 Shed, BARC, Trombay, Mumbai, 400085, India

    S. Rayaprol

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  1. Aswin V.
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Correspondence to Anjana Dogra.

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Aswin V., Kumar, P., Singh, P. et al. Influence of Al doping in LaCoO3 on structural, electrical and magnetic properties. J Mater Sci 50, 366–373 (2015). https://doi.org/10.1007/s10853-014-8595-3

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