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LEEM Investigation of Refractory Metals Grown on Insulating Substrates: Nb(110) on Sapphire$(11\bar{2}0)$

Author

Listed:
  • W. Świȩch

    (Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA)

  • R. S. Appleton

    (Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA)

  • B. D. Wiemeyer

    (Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA)

  • C. P. Flynn

    (Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2985, USA)

Abstract

We summarize LEEM studies of Nb (110) single crystals grown by MBE onAl2O3$(11\bar{2}0)$. At temperatures between 1300 K and 1600 K the structure relaxes to create flat terraces several μm wide, and stable subgrain boundaries, by clearly visible interfacial and surface processes. The Nb surface exhibits two mirror-equivalent variants of a reconstruction, one of which prevails at low temperatures. Upon approachingTcat~1480K, the two variants alternate in extended stripes along$[1\bar{1}0]$, with stripe widths that decrease smoothly asTapproachesTc. Both at lowTand aboveTc, variants are trapped at dislocation strain fields.

Suggested Citation

  • W. Świȩch & R. S. Appleton & B. D. Wiemeyer & C. P. Flynn, 1998. "LEEM Investigation of Refractory Metals Grown on Insulating Substrates: Nb(110) on Sapphire$(11\bar{2}0)$," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 5(06), pages 1221-1231.
    • Handle: RePEc:wsi:srlxxx:v:05:y:1998:i:06:n:s0218625x98001559
    DOI: 10.1142/S0218625X98001559
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