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The structural, dielectric, and magnetic properties of Al3+ doped Sm3Fe5O12 ceramics

  • Original Paper: Sol-gel and hybrid materials for dielectric, electronic, magnetic and ferroelectric applications
  • Published:
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Abstract

The polycrystalline ceramics of Sm3Fe5-xAlxO12 (x = 0, 0.5, 1, and 2) are prepared by the sol–gel method. The structure, dielectric, and magnetic properties are studied. The X-ray diffraction patterns indicate that the prepared samples crystallize in garnet phase. All of the samples exhibit relatively high-dielectric permittivity in the low-frequency range. With the increase of Al3+ content, the dielectric permittivity and the temperature and frequency stabilities at low frequency simultaneously decrease, which suggest the important role of Fe3+ for the dielectric property. Two sets of dielectric relaxation are observed in the available temperature from 300 to 700 K. With the increase of Al3+ concentration, the high-frequency relaxation peaks that originate from the carriers hopping between Fe2+ and Fe3+ shift toward the direction of low frequency, and the low-frequency relaxation processes that arise from the doubly ionized oxygen vacancies spread to high frequency. By measuring the hysteresis loops and the magnetization-temperature curves, it indicates that the magnetization is decreased and the magnetic property transforms from ferrimagnetism to paramagnetism with increasing the value of x at room temperature.

Large permittivity and ferrimagnetic property are observed in Sm3Fe5O12 and they are decreased via Al3+ doping, reflecting the crucial role of Fe3+ for the high performance.

Highlights

  • Sm3Fe5-xAlxO12 (x = 0, 0.5, 1, and 2) are fabricated via sol–gel method.

  • The dielectric relaxation processes are influenced by the content of iron ions.

  • Two magnetic anomalies are detected at low temperature.

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Acknowledgements

This work is supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11704091, 51601049, and 11604067), and the National Natural Science Foundation of China (Grant No. 11574066, 11747014).

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Authors and Affiliations

  1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, People’s Republic of China

    S. Huang, L. Feng, W. Shi, K. P. Su, H. O. Wang & D. X. Huo

  2. School of Physics and Electrical Engineering, Anyang Normal University, Anyang, 455000, People’s Republic of China

    L. R. Shi

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  1. S. Huang
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  2. L. Feng
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Huang, S., Feng, L., Shi, W. et al. The structural, dielectric, and magnetic properties of Al3+ doped Sm3Fe5O12 ceramics. J Sol-Gel Sci Technol 90, 611–620 (2019). https://doi.org/10.1007/s10971-019-04944-1

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  • DOI: https://doi.org/10.1007/s10971-019-04944-1

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