Phase developments in the Pb(Zn_(1/2)W_(1/2))O_3-Pb(Zn_(1/3)Ta_(2/3))O_3-Pb(Zn_(1/3)Nb_(2/3))O_3 pseudo-ternary system

摘要

The phase stability ranges in the B-site precursor (Zn_(1/2)W_(1/2))O_2-(Zn_(1/3)Ta_(2/3))O_2-(Zn_(1/3)Nb_(2/3))O_2 were determined by X-ray diffraction (XRD), where wolframite, tri-αPbO_2, and columbite phases were identified. Next attempts were carried out (with the addition of PbO) for the system Pb (Zn_(1/2)W_(1/2))O_3-Pb(Zn_(1/3)Ta_(2/3))O_3-Pb(Zn_(1/3)Nb_(2/3))O_3, where the perovskite phase did not develop in the entire compositions investigated. Instead, only the Pb_2WO_5 and pyrochlore phases (along with ZnO) resulted.