文摘
Four new quaternary isostructural rare-earth thiosilicates, ZnY6Si2S14 (1), Al0.50Dy3(Si0.50Al0.50)S7 (2), Al0.38Dy3(Si0.85Al0.15)S7 (3), and Al0.33Sm3SiS7 (4), crystallized in the chiral and polar space group P63, have been prepared by a facile synthetic routine. Compounds 1−3 show strong second harmonic generation effects at 2.1 um with the intensities of 1, 2, and 3 being about 2, 2, and 1 times that of KTP (KTiOPO4), respectively. The calculated band structure of 1 implies that the optical absorptions of BLn6M2Q14 and ALn3MQ7 family compounds are mainly ascribed to the charge transitions from Q−p to Ln−4f (4d for Y) states. Compounds 2−4 exhibit antiferromagnetic-like interactions.