Piezoelectric Properties of Sn₂P₂S₆Ceramics

Abstract

The in®uence of the sample orientation on the e¬ective value of the hydrostatic piezoelectric coe¯ cients d (i) h of Sn 2 P 2 S 6 crystals has been studied. The hydrostatic piezoelectric coe¯ cients d (1) h and d' (3) h , were measured, d (1) h = (244 § 3) pC/N and d' (3) h = (92 § 1) pC/N. The hydrostatic piezoelectric coe¯ cient d (3) h for orthogonal axis system was calculated to be d (3) h = (87 § 2) pC/N. The optimal orientation of the sample has been found as (XYl)-20¸-cut. Maximal value of the e¬ective hydrostatic piezoelectric coe¯ cient d (1) h equals 260 pC/N. Double rotated samples were also studied. The orientation of the samples insensitive to the pressure has been found. The theoretical mean value of hydrostatic piezoelectric coe¯ cient (d h) mean corresponding to randomly oriented Sn 2 P 2 S 6 grains in a poled composite has been calculated to be (d h) mean = 136 pC/N.