A transmission electron microscopy study of two B-site order perovskites Pb(Co1/2W1/2)O3 and Pb(Sc1/2Ta1/2)O3 has revealed evidence for an incommensurate phase within the antiferroelectric and ferroelectric phase, respectively. Direct observations by dark field techniques have revealed discommensurate structures in both Pb(Sc1/2Ta1/2)O3 and Pb(Co1/2W1/2)O3. A possible lock-in transition is found in Pb(Sc1/2Ta1/2)O3, but the incommensurate to commensurate transition seems to be dependent on the degree of B-site order.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics