Abstract
The influence of post-growth short-term low-temperature annealings (O2, 400°C, 5–15 min) on the composition, crystal structure, and superconductivity of Bi2Sr2CaCu2O8 + δ and Bi2Sr2CuO6 + δ oxycuprate whiskers freely grown in gas cavities has been investigated. The optimal conditions for growth in closed gas cavities in a flux and post-growth annealing in oxygen were found, making it possible to obtain high-quality superconducting Bi 2212 and Bi 2201 whiskers in a wide doping range (from heavily underdoped to optimally doped) with a small rocking curve half-width (∼0.1°–0.2°) and narrow superconducting transition (ΔT = 1.5–2 K).
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