Preparation of a Single Crystalline Powder of Superconducting YBa₂Cu₃O7-x by the Gas Phase Solidification Method

The preparation of a single crystalline powder of superconducting YBa 2 Cu 3 O 7- x was investigated for the gas phase solidification process by decomposing an evaporated solution of yttrium, barium and copper acetates. A transmission electron microscope observation of particles less than 0.3 µm in diameter showed that the as-produced particles were twinned at transformation to orthorhombic YBa 2 Cu 3 O 7- x . The as-produced powder was a single phase YBa 2 Cu 3 O 7- x and did not exhibit an isomer from the X-ray diffraction pattern.