The electrostrietive strains induced by high electric fields have been measured for compositions in the solid solution system Pb(Mg1/3Nb2/3)O3: PbTiO3 (PMN:PT) containing up to 20 mole% PT. Large anhysteretic quadratic strains (up to 1,000 × 10−6) can be induced at room temperature with no evidence of remanence. In pure Pb(Mg1/3Nb2/3)O3 the electrostrietion constants Q11 Q12are significantly smaller than in normal perovskites and the large induced strains may be traced to the high polarizability of the relaxor. With the addition of PT, the Q constants increase and the relaxation range shortens, with compositions close to 10 mole% PT providing maximum quadratic sensitivity. Over the relaxation range of temperatures, the thermal expansion is extremely small and comparable to the best thermally stable glasses and ceramics.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics