抄録
The effect of water vapor in a calcining atomosphere on Tc, off of YBa2Cu3O7-x was investigated using the electrical resistivity method, X-ray diffraction analysis and carbon analysis. The results are as follows:
(1) The critical temperature(To, off) elevated with increasing H2O partial pressure, reached a maximum(90.5K) at a H2O partial pressure of about 5kPa, and then lowered.
(2) The water vapor remarkably accelerated the decomposition of BaCO3. However, the excessive addition of water vapor was detrimental because of the formation of an unknown phase.
