GRAIN-GROWTH OF HIGH T(C) YBA2CU3O7-X

Grain growth during sintering of the polycrystalline high onset temper ature superconductor YBa2Cu3O7-x has been examined by measuring grain sizes at various temperatures for different times above 900-degrees-C. The grain size distribution is found to be predominately lognormal af ter some sintering time. The mean grain size increases with both tempe rature and time. The standard deviation of the grain size distribution increases with temperature, but appears to be independent of time. Th e grain growth law may have an exponent of five. The grain growth rate may be affected by the grain size of the calcined powder.