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Optical and magnetic properties of nanostructured cerium-doped LaMgAl11O19

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Abstract

Cerium-doped lanthanum magnesium bulk aluminate (La1–xCexMgAl11O19, x = 0.03–0.50; abbreviated as LMA) was prepared via the Pechini sol–gel method after heating at 1200 °C for 2 h. The resulting single-phase ceramics was studied in terms of its structure using X-ray diffraction and optical properties using photoluminescence, its decay time, and radioluminescence spectroscopy. The diffraction and electron microscopy demonstrated LMA’s plate-shaped nanocrystals with structure anisotropy and relatively broad particle size distribution. The optical measurements fully manifested the complexity of the LMA crystal structure. The radioluminescence study of cerium-doped LMA is here presented for the first time and, thus, contributes to the basic knowledge of Ce-doped materials. Additionally, the magnetic susceptibility exhibiting paramagnetic behavior of Ce3+ ions is presented. The magnetic data were interpreted in terms of local atomic Hamiltonian involving the crystal field and the Zeeman effect applied on the ground state J = 5/2 multiplet.

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Acknowledgments

This work was supported by the Czech Science Foundation, Grant No. 20-03253S, and the Ministry of Education of the Czech Republic, Grant No. A1_FCHT_2020_007 for specific university research. Partial support of Operational Programme Research, Development and Education was financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth and Sports (Project No. SOLID21 CZ.02.1.01/0.0/0.0/16_019/0000760) is gratefully acknowledged. Many thanks belong to Emilly Schroering, BSc., for her help with the improvement of the English language in this article.

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Nádherný, L., Doležal, V., Sedmidubský, D. et al. Optical and magnetic properties of nanostructured cerium-doped LaMgAl11O19 . Journal of Materials Research 35, 1672–1679 (2020). https://doi.org/10.1557/jmr.2020.119

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