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Metallurgical Transactions A

, Volume 10, Issue 10, pp 1499–1503 | Cite as

Effect of oxygen on microstructures of high-rate sputter-deposited Nb3Sn superconductors

  • J. L. Brimhall
  • R. Wang
Alloy Phases and Structure
  • 32 Downloads

Abstract

The role of excess oxygen and deposition temperature on the microstructure and critical temperature (T c ) has been studied in high-rate, sputter deposited Nb3Sn. Excess oxygen does not significantly affect the grain size of the A15 phase whether it is deposited at low temperature followed by annealing or deposited directly at an elevated temperature. Oxygen does promote the formation of the amorphous phase during deposition at low temperature. During subsequent transformation of material sputter deposited at room temperature, gas bubbles form from the entrapped sputtering gas. Excess oxygen also promotes greater precipitate formation during deposition at elevated temperature. In no case was there a large change in the superconducting transition temperatureT c ; however, the microstructural features may have significant effects on the critical current densityJ c .

Keywords

Metallurgical Transaction Amorphous Phase Critical Current Density Krypton Superconducting Transition Temperature 
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Copyright information

© The Metallurgical of Society of AIME 1979

Authors and Affiliations

  • J. L. Brimhall
    • 1
  • R. Wang
    • 1
  1. 1.Pacific Northwest LaboratoryBattelle Memorial InstituteRichland

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