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Ex situ and in situ doping processes of refractory Ta were accomplished by pulsed laser ablation of bulk Ta in vacuum with C–O–H supply from C-coated collodion film and within tetraethyl orthosilicate (TEOS), respectively. Analytical electron microscopic observations of the resultant particulates and condensates indicated that the former process involved interdiffusion in the condensed state to form...
Pulsed laser ablation of bulk TaC in vacuum under a high power density was used to fabricate fine-sized tantalum carbide particles, i.e., γ-TaC1−x with varied extent of carbon deficiency and α-Ta2C surrounded by an amorphous phase of Ta-doped carbon clusters or lamellae according to X-ray and electron diffraction. The predominant γ-TaC1−x has a high x value (~0.4) and almost spherical shape when...
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