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Fabrication and characterization of rare earth hexaboride single-crystal materials

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Abstract

Oriented single crystals of LaB6, CeB6 and PrB6 have been prepared by the arc float-zone refining technique, which is described. A critique of the various possible preparation techniques is given. Wet chemical methods were used to determine bulk stoichiometries of samples prepared from starting materials of various R/B compositions (where R = rare earth). It was found that LaB6,09, a desired composition, could be grown in single-crystal form from LaB6.2 starting material, the excess boron compensating for preferential boron vaporization. Starting materials with B/La < 6.2 produce a B/La gradient in two-pass zone-refined specimens. The level of metallic impurities in arc zone-refined LaB6 is lower than that reported elsewhere for laser zone-refined LaB6. Residual oxygen present in the zone-refined specimens was found to produce second-phase inclusions, which were studied in detail. The effect of contamination of LaB6 surfaces by evaporated refractory metals has also been investigated.

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Authors and Affiliations

  1. Oregon Graduate Center, Beaverton, Oregon, USA

    Paul R. Davis & Lynwood W. Swanson

  2. RADC/Solid State Sciences Division, Hanscom AFB, Massachusetts, USA

    Joseph J. Hutta

  3. Tektronix, Inc., Beaverton, Oregon, USA

    Douglas L. Jones

Authors
  1. Paul R. Davis
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  2. Lynwood W. Swanson
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  3. Joseph J. Hutta
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  4. Douglas L. Jones
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Davis, P.R., Swanson, L.W., Hutta, J.J. et al. Fabrication and characterization of rare earth hexaboride single-crystal materials. J Mater Sci 21, 825–836 (1986). https://doi.org/10.1007/BF01117360

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  • DOI: https://doi.org/10.1007/BF01117360

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