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Effects of La doping on structural, magnetic, and ferroelectric properties of Aurivillius Bi6Fe1.4Co0.6Ti3O18 thin films

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Abstract

The effects of La ions substitution on the structural, magnetic, ferroelectric and leakage properties of Aurivillius Bi6−xLaxFe1.4Co0.6Ti3O18 (BLFCTO, 0 ≤ x ≤ 1) thin films are investigated. X-ray diffraction (XRD) refinement results indicate that all the samples have an orthorhombic crystal structure and the space group of B2cb. The coexistence of room-temperature ferromagnetism and ferroelectricity can be found in all the samples. Doping La ions can increase ferroelectricity magnitude and decrease leakage current. Furthermore, the energy conversion efficiency can be significantly improved from 16.0 to 53.1% due to the decrease of leakage current. The remanent magnetization 2Mr of 8.2 emu/cm3 and polarization 2Pr of 37.4 µC/cm2 are observed in the x = 0.6 sample. The changes of magnetic, ferroelectric, and leakage properties are discussed in terms of lattice distortion, grain size, oxygen vacancy and compactness. The present work provides an available way to explore room-temperature multiferroics (MFs) and optimize energy efficiency in Aurivillius compounds.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant no. 51702002), the Major Foundation of Education Department of Anhui Province (Grant nos. KJ2018A0529 and KJ2018A0526), the Natural Science Foundation of Anhui Province (Grant no. 1808085MA09) and the Talent Project of Anhui Science and Technology University (Grant nos. DQYJ201703, DQWD201603 and HCYJ201705).

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Authors and Affiliations

  1. College of Electrical and Electronic Engineering, Anhui Science and Technology University, Fengyang, 233100, China

    Xuzhong Zuo & Enjie He

  2. Key Laboratory of Materials Physics, Institute of Solid State Physics, University of Chinese Academy of Sciences, Hefei, 230031, China

    Zhe Liu, Jie Yang, Xuebin Zhu & Jianming Dai

  3. College of Chemistry and Materials Engineering, Anhui Science and Technology University, Fengyang, 233100, China

    Zhenzhen Hui

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  1. Xuzhong Zuo
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Correspondence to Jie Yang or Jianming Dai.

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Zuo, X., Liu, Z., He, E. et al. Effects of La doping on structural, magnetic, and ferroelectric properties of Aurivillius Bi6Fe1.4Co0.6Ti3O18 thin films. J Mater Sci: Mater Electron 29, 20133–20140 (2018). https://doi.org/10.1007/s10854-018-0145-3

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