Determination of the electrostriction tensor components in single-crystal CaF2 from the uniaxial stress dependence of the dielectric permittivity

The separated electrostriction tensor components have been measured for single-crystal calcium fluoride by the converse effect, using a specially designed uniaxial elastic stressing jig. Values obtained for the individual components of the electrostrictive voltage (M) coefficients were M11=−0.132, M12=0.117, and M44=0.507 in units of 10−20 m2/V2. These values are smaller than those observed by direct measurement of electric-field-induced elastic strain (K. Rittenmyer, Ph.D. thesis, The Pennsylvania State University, 1984), but are closer to expected values and likely to be more reliable.