A simplified AC capacitance dilatometer based on the design of Uchino and Cross1 has been constructed to measure directly the temperature dependence of electro strictive strain in perovskite type ferroelectric crystals and ceramics.A mechanical bridge circuit is used to compensate for thermal expansion of the mechanical components, eliminating the need for DC servo stabilization. The instrument has been used in the temperature range from 20°C to 20OoC. In the AC method, the electro strictive strain under AC driving field is compared to the known strain induced in a quartz reference crystal under phase locked conditions. The method has been checked with the known piezoelectric behavior of quartz and of selected PZT disk samples. Measurements of Q constants will be reported for lead magnesium niobate(PMN), lead magnesium niobate:lead titanate solid solutions(PMN:PT), and lead iron niobate:lead iron tungstate(PFN:PFW).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics