Abstract
Nitrate melts as fluxes are useful for the preparation of oxides. Oxidation atmosphere, supply of active raw material are expected. By using nitrate melts and their decomposition, high Tc superconducting YBa2Cu3Ox crystal was prepared at 690°C under a NOx/Ox gas pressure of 0.1MPa. For comparison, a mixture of Y2O3, CuO and Ba(NO3)2 was heated at 690°C in air but YBa2Cu3Ox crystal was not formed.
