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

Publication Type	Journal Article

Authors	Wing-Tat Chan Xianglei Mao Richard E Russo
LBL Report Number	LBNL-31914
Abstract	Nanosecond and picosecond pulsed laser ablated materials from Bi-Sr-Ca-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
Notes	LBNL-31914 NOT IN FILE
Journal	Applied Spectroscopy
Volume	46
Year of Publication	1992
Issue	6
Pagination	1025-1031
URL	http://www.opticsinfobase.org/as/abstract.cfm?URI=as-46-6-1025
Keywords	Deposition Target Emission Power Evaporation Material Thin films Ablation Laser Laser ablation Laser ablation Superconducting Vaporization Intensities Intensity High-tc Oxide Time Ca Composition Element Mass Sampling Spectrometry Constant Cu Ratio Vapor Crater Mechanism Icp-aes Elements Emission spectrometry Emission spectrometry Ratios Inductively coupled plasma atomic emission spectrometry Picosecond Ablated material Array Bi Bi-sr-ca-cu-o Cuo Density Droplet Droplets High-temperature superconductors Laser ablation deposition Laser sampling Nanosecond Oxides Phase Pulsed laser Pulsed laser Sem Sr Steady state Targets Thermal Thermal vaporization
Organizations	Laser Technologies Group Energy Storage and Distributed Resources Division
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