The dielectric and piezoelectric properties of a KNbO3 single crystal under applied hydrostatic pressure and positive bias electric field are investigated using phenomenological Landau-Ginzburg-Devonshire (LGD) thermodynamic theory. It is shown that the hydrostatic pressure effect on the dielectric and piezoelectric properties is similar to temperature, suggesting a common underlying mechanism for the piezoelectric anisotropy and its enhancement. The stable phase diagram of KNbO3 as a function of temperature and positive bias electric field is constructed. The maximum piezoelectric coefficient d33o* varying with temperature and electric field is calculated.
Revised: September 4, 2013 |
Published: September 18, 2012
Citation
Liang L., Y. Li, F. Xue, and L. Chen. 2012.Pressure and electric field effects on piezoelectric responses of KNbO3.Journal of Applied Physics 112, no. 6:Article No. 064106.PNNL-SA-89993.doi:10.1063/1.4752418