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Metamagnetic DyAlO3 nanoparticles with very low magnetic moment

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Abstract

Nanocrystalline dysprosium monoaluminate (DyAlO3) has been synthesized by modified sol–gel method after sintering the precursor gel at 950 °C. The micro-structural features have been verified by X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy. The XRD pattern confirms the formation of single-phase DyAlO3; the average size of the nanoparticles is 50 nm. X-Ray photoelectron spectroscopy has been used to study the chemical composition and bonding in the samples. The binding energies of core-level electrons in Dy, Al and O in DyAlO3 nanopowder have been found slightly shifted compared to the respective values of the same elements. Both AC and DC magnetic susceptibilities have been measured in the temperature range 2–300 K. Unusually low effective magnetic moment of Dy3+, μeff = 0.38, has been derived from the inverse magnetic susceptibility–temperature plot between 4 and 252 K. The Nèel temperature, TN = 3.920 K and exchange interaction constant J/k = −1.74 K, have been also determined.

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Acknowledgments

The authors would like to thank the University of Food Technologies-Plovdiv for the financial support.

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Authors and Affiliations

  1. Department of Inorganic and Physical Chemistry, University of Food Technologies, 26, Maritsa Blvd., 4002, Plovdiv, Bulgaria

    D. Petrov & B. Angelov

  2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72, Tzarigradsko Chaussee, 1784, Sofia, Bulgaria

    V. Lovchinov

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  1. D. Petrov
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  2. B. Angelov
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  3. V. Lovchinov
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Correspondence to D. Petrov.

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Petrov, D., Angelov, B. & Lovchinov, V. Metamagnetic DyAlO3 nanoparticles with very low magnetic moment. J Sol-Gel Sci Technol 58, 636–641 (2011). https://doi.org/10.1007/s10971-011-2438-3

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  • DOI: https://doi.org/10.1007/s10971-011-2438-3

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