Preparation of the Bi<sub>2</sub>O<sub>3</sub>-based Fluorite-type Solid Solutions by Mechanical Alloying

A mechanical alloying technique was applied to the mixtures of(Bi203)o．75(Y203)o．25and (Bi203)・．眠Nb205)・．2・tosynthesizesolidsolutionsofthenuorite-typestructure．AmoIphization occurred fbr(Bi203)o．75(Y203)o．25 while the fluorite-type phase is directly obtained fbr (Bi203)o．8岬Nb205)o．20by ball milling fbr l20h．The amorphous sample of(Bi203)o．75(Y203)o．25 tumed into the fluorlte-type phase under the condition of500。C and lO minutes annealing， which was much more mild as compared to that ofthe conventional solid state reaction，