Complete stabilization of crystals of the high-T(c) superconducting ox
ide (PbBi)2Sr2Ca2Cu3O10, which is characterized by a T(c) of 110 K and
space group of A2aa, has been achieved by synthesizing the material i
n an FeO-doped CuO flux. The resulting crystals formed with a chemical
ly inert FeO surface layer appear resistant to further etching or degr
adation at room temperature and atmosphere.