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Differential Vaporization during Laser Ablation/Deposition of Bi-Sr-Ca-Cu-O Superconducting Materials

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Nanosecond and picosecond pulsed laser ablated materials from Bi-Sr-Cu-O superconducting targets are monitored by inductively coupled plasma-atomic emission spectrometry with a photodiode array detector. Differential vaporization was observed; elements of the lower-melting-point oxides (Bi2O3 and CuO) are enriched in the vapor phase, indicating a thermal vaporization mechanism. Melted droplets observed with SEM and enriched Ca and Sr content in the ablation crater measured with EDX support the hypothesis. A steady-state mass ablation composition after prolonged laser sampling is also observed; the ratios of intensity for Bi, Ca, and Sr to Cu are constant for power density 0.1 to 3.0 GW/cm2.

Keywords: High-temperature superconductors; ICP-AES; Laser ablation; Thermal vaporization

Document Type: Research Article


Affiliations: Lawrence Berkeley Laboratory, M/S 90-2024, Berkeley, California 74720

Publication date: June 1, 1992

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