Abstract
The results of this investigation were: (1) Amorphous PMW was obtained by a rapid quenching method using a twin-roller apparatus. (2) The dielectric constants of quenched PMW showed a peak at 650K. This could be explained by ionic conductivity change due to its glass transition and crystallization process. (3) Three crystalline phases (Pb(Mg1/2W1/2)O3, PbWO4, Pb2WO5) were found when the quenched PMW was heated above the crystallization temperature. (4) The dielectric constants of annealed PMW showed a peak at 283K. This was attributed to a phase transition in the precipitated perovskite phase, though the transition temperature was 30K below that of sintered PMW.
