Transverse and longitudinal elastic strain have been measured for electric fields applied along the 〈100〉 direction in single crystals of lead magnesium niobate [Pb(Mg1/3Nb2/3)03], using a bonded strain gauge technique. A quadratic electrostrictive relation holds between induced elastic strain and electric polarization for temperatures near the low-frequency dielectric maximum. The electrostriction coefficients are almost temperature independent with values Q11=2.50×10 -2 m4/C2 and Q12=-0.96×10 -2 m4/C2. To check the direct measurements, the hydrostatic Q coefficient was determined independently by measuring the pressure dependence of the dielectric permittivity. The value Qh =0.60×10-2 m4/C2 obtained is in good agreement with that calculated from the direct measurements.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)