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Interaction of lanthanum with boron and carbon: phase diagram and structural chemistry

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Abstract

The isothermal section of the La–B–C phase diagram at 1,270 K has been investigated by means of X-ray, neutron powder diffraction, microstructure and EPMA analyses. Eight ternary compounds were found, and for six of them, the crystal structures have been established. The phase with the structure type of La5B2C6 has a broad homogeneity range described by the formula La5(BC) x (5.6 ≤ x ≤ 8.8). The lanthanum sesquicarbide La2C3 exhibits an extended solid solution in the ternary domain La2C3−x B x (x = 0.4). The boron substitution of carbon leads to the decrease of the superconducting temperature from 13.4 K for La2C3 to 10.0 K for La2C2.8B0.2 and from 5.6 K for La2C2.7 to 4.1 K for La2C2.6B0.4. The compositions of two new compounds ~La4B3C12 and ~La4B5C18 were found via WDX analysis.

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Acknowledgments

The authors gratefully thank M. Babizhetska for the sample preparation, Dr. C. Hoch for X-ray intensity data collection, E. Brücher for the magnetization measurements, and V. Duppel for EPMA analysis.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Ivan Franko National University of Lviv, Kyryla and Mefodiya Str. 6, 79005, Lviv, Ukraine

    Volodymyr Babizhetskyy

  2. Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, Postfach 800665, 70569, Stuttgart, Germany

    Volodymyr Babizhetskyy & Arndt Simon

  3. Laboratoire de Chimie du Solide et Inorganique Moléculaire, UMR CNRS 6511, Institut de Chimie, Université de Rennes 1-ENSCR, Campus de Beaulieu, Avenue du Général Leclerc, 35042, Rennes Cedex, France

    Josef Bauer

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  1. Volodymyr Babizhetskyy
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  3. Josef Bauer
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Correspondence to Volodymyr Babizhetskyy.

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Babizhetskyy, V., Simon, A. & Bauer, J. Interaction of lanthanum with boron and carbon: phase diagram and structural chemistry. Monatsh Chem 145, 869–876 (2014). https://doi.org/10.1007/s00706-014-1172-2

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  • DOI: https://doi.org/10.1007/s00706-014-1172-2

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