The electro-optic coefficients of silver thiogallate (AgGaS2)

Silver thiogallate is a transparent, pale yellow crystal belonging to point group 42m. The electro-optic coefficients of single crystal specimens grown from the melt were found to be r 63 =3.0+or-0.1 and r 41 =4.0;+or-0.2 in units of 10 -12 mV -1 . The 25 MHz dielectric constants measured along and perpendicular to the optic axis are 14 and about 10, respectively. The results are discussed in terms of Miller's (1964) rule and the properties of comparable II-VI compounds.