Effect of oxygen on microstructures of high-rate sputter-deposited Nb3Sn superconductors
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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 .
KeywordsMetallurgical Transaction Amorphous Phase Critical Current Density Krypton Superconducting Transition Temperature
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