In order to achieve compositional homogeneity and phase stability, colloidal processing and forced-precipitation method were utilized to prepare various Y2O3- and Nb2O5-doped Bi2O3 materials. Colloidal properties of three starting powders were investigated with respect to the homogeneity on the bulk sample surface and cross-sectional areas by a statistical approach. The crystalline phases were determined by XRD and electron diffraction. Besides, electric conductivity of the samples was measured. The results show acceptable conductivity of sintered B15N6Y, exceeds 10-2 S/cm, at 500oC. The dispersion mechanism of fine oxide powders will be discussed in this work.