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short communications
Upon irradiation with a Nd-glass laser SHG has been found in a series of structurally closely related compounds of cubic (F3m) or monoclinic (Cc) symmetry with the following cell contents: Cd16Si4S24(Cc), Cd16Ge4S24 (Cc), Cd14P4S24 (Cc), Cd13P4S22I2 (Cc), Cd13P4S22I2 (F3m) and Cu24P4S20Br4 (F3m). The highest effect - comparable with that of LiNbO3 - was noted in Cd13P4S22I2 (Cc). All measurements were performed on powders.