It was found that complete solid solutions are formed in the systems of Pb(Fe2/3W1/3)O3-Pb(Mg1/3Ta2/3)O3andPb(MgW)1/2O3-Pb(FeTa)1/2O3. Pb(Fe2/3W1/3)O3and Pb(Mg1/3Ta2/3)O3are disordered perovskite type ferroelectrics, nevertheless the ordered arrangement of ions in the octahedral positions is formed to some degree in a certain region of intermediate composition. In the case of Pb(MgW)1/2O3-Pb(FeTa)1/2O3, the state changes from antiferro-to ferro-electric at about 70 mole percent of Pb(FeTa)1/2O3. The X-ray intensity of superlattice reflections was analyzed based on two different models. To confirm the ferro- or antiferro-electric behavior, the permittivity was measured in Pb(MgW)1/2O3-Pb(FeTa)1/2O3system under applying d.c. bias field, and forced transition from antiferro to ferro-electric state was observed to occur in the biasing cycle.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)