An aqueous coprecipitation synthesis process has been developed to pre
paring high quality N-type NdCeCuO superconductors. Due to the intimat
e mixture of coprecipitates was treated at the atomic level; with prop
er controlling the pH value of the solutions, the superconducting prop
erties of the final homogeneous fine-grain-size NdCeCuO superconductor
s are much better than that prepared by solid state reaction technique
.