The E-field dependence of piezoelectric properties of rhombohedral single crystal PZN-4.5%PT were investigated as a function of crystallographic orientation. For 〈111〉 oriented crystals, crystal partial depoling and subsequent domain reorientation results in a peak in dij vs. E-field curves at ∼ 5kV/cm, followed by nonhysteretic dij saturation. This behavior indicates that crystal became single domain at E>30kV/cm. Low field values for dij's of single domain crystals were calculated by extrapolating these high field values. Hydrostatic piezoelectric coefficient dh ∼ 55pC/N, calculated for the single domain crystal, also could be measured in the hydrostatic chamber. In contrast to 〈111〉 poled crystals, stable domain configurations of 〈001〉 oriented crystals were the origin of consistent dij values regardless of the measurement technique. Piezoelectric coefficients, d33 ∼ 2280pC/N and d31 as high as -1000 pC/N were reproducibly measured. Although dh=d33+2d31 is relevant to the related symmetry, calculated dh - 300pC/N could not be obtained from the response under hydrostatic pressure ( dh ∼ 50pC/N ). This discrepancy is discussed in relation to the domain state and crystal symmetry.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics