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Structure, photoluminescence and electrical properties of Eu–Nd codoped CaBi4Ti4O15 synthesized by sol–gel method

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Abstract

Eu–Nd codoped CaBi3.75−x Eu x Nd0.25Ti4O15 (CBENT) powders were synthesized by a simple sol–gel method. Their structures were examined by X-ray diffraction, Raman spectrum, respectively. The coexistence of orthorhombic and tetragonal phase was found when the Eu3+ doping content varied from 0.3 to 0.6. The photoluminescence properties of the CBENT powders show that the intense emission bands centered at around 574, 590 and 612 nm are due to the transitions of 5D0 → 7F0, 5D0 → 7F1 and 5D0 → 7F2 of the Eu3+ ions, respectively. The spectra of the temperature dependence of dielectric constant indicate that the Curie temperature T C gradually decreases from 785 to 765 °C. The peaks of dielectric constant are restrained with increasing Eu3+ doping concentration, suggesting the weakness of the ferroelectricity. Combining the photoluminescence with the ferroelectric property in the CBENT, the optimal Eu3+ doping concentration x is 0.2.

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Acknowledgments

The authors would like to thank Dr. Peng Zheng, Zhigang Gai and Minglei Zhao for dielectric, ferroelectric test and helpful discussion. This work was supported by the Natural Science Foundation of China under the grant No 50802023, Scientific and Technological Brainstorm Key Project of Henan Province (082102270039, 102102210115), the Finance Assistance Scheme of Backbone Youth Teachers in University of Henan Province (2009GGJS-026) Research Plan for Natural Science in the Education Department of Henan Province (2009A430002, 2011A430004).

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Authors and Affiliations

  1. Institute of Microsystem, Key Laboratory of Photovoltaic Materials, Department of Physics, Henan University, Kaifeng, 475004, People’s Republic of China

    H. W. Zheng, X. Y. Liu, W. C. Wang, H. R. Zhang, Y. X. Wang, G. S. Yin, Y. Z. Gu & W. F. Zhang

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  1. H. W. Zheng
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Zheng, H.W., Liu, X.Y., Wang, W.C. et al. Structure, photoluminescence and electrical properties of Eu–Nd codoped CaBi4Ti4O15 synthesized by sol–gel method. J Sol-Gel Sci Technol 58, 539–544 (2011). https://doi.org/10.1007/s10971-011-2425-8

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