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Crystal Growth, Morphology and Composition of Solid Solutions of RAl2.07(B4O10)O0.6 (R = La, Ce, Pr, Gd) Dimetaborates

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Abstract

We have found conditions for reproducible spontaneous crystal growth of (RxLa1 –x)Al2.07(B4O10)O0.6 (R = Ce, Pr; x = 0, 0.003, 0.03, 0.5, 1) dimetaborate solid solutions. The composition and morphology of the crystals have been studied and limitations on isomorphous substitutions on the rare-earth site within the stability range of their structure type have been found out. We have studied the thermal properties of lanthanum dimetaborate. According to differential thermal analysis, X-ray diffraction, and analytical scanning electron microscopy data, this compound melts incongruently in the range 1120–1200°C, with a maximum endothermic peak at 1165°C. The decomposition products have been shown to include Al18B4O33, Al4B2O9, and LaBO3.

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ACKNOWLEDGMENTS

We are grateful to L.V. Shvanskaya for determining the phase composition of our samples by X-ray diffraction and to L.V. Mel’chakova for investigating the thermal properties of lanthanum dimetaborate.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 18-05-01085-a.

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Authors and Affiliations

  1. Moscow State University, 119991, Moscow, Russia

    E. V. Koporulina, V. V. Maltsev, N. I. Leonyuk & E. A. Volkova

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  1. E. V. Koporulina
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  2. V. V. Maltsev
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  3. N. I. Leonyuk
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  4. E. A. Volkova
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Correspondence to E. V. Koporulina.

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Translated by O. Tsarev

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Koporulina, E.V., Maltsev, V.V., Leonyuk, N.I. et al. Crystal Growth, Morphology and Composition of Solid Solutions of RAl2.07(B4O10)O0.6 (R = La, Ce, Pr, Gd) Dimetaborates. Inorg Mater 56, 739–746 (2020). https://doi.org/10.1134/S0020168520070079

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  • DOI: https://doi.org/10.1134/S0020168520070079

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