Growth of YBa,Cu,O, single crystals from a mixture of YBa,Cu,O,, and Ag,O
نویسندگان
چکیده
Single crystals of the superconductor YBa$usO,, have been grown from a mixture of solid phase YBa,CusO,, and liquid phase silver. Crystals with a thickness of up to 1 mm along the c axis can be obtained when the mixture is soaked at 1005 “C for more than 8 h. Silver melt enhances the peritectic partial melting of the YBa&usO,, solid phase, and induces the solution and reprecipitation process during sintering at 1005 “C. Stacked plate-like YBa,Cu,O,, grains grow through a coalescence process. Crystals are heavily twinned after 20 h of O2 annealing at 500 “C. They exhibit a sharp superconducting transition with an onset temperature of 93 K in zero field.
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