Single crystals of Y2Cu2O5 were grown from a Cu2O flux by a slow cooli
ng method. One of the advantages of the present method is the use of a
nonpoisonous flux instead of the conventionally used, relatively toxi
c, potassium fluoride. The satisfactory quality of the single crystal
form was confirmed by comparison of the lattice parameters and the Y/C
u ratio between the single crystal and the powdered sample.