title: A series of new infrared NLO semiconductors, ZnY6Si2S14, Al(x)Dy3(Si(y)Al(1-y))S7, and Al0.33Sm3SiS7.
abstract: Four new quaternary isostructural rare-earth thiosilicates, ZnY(6)Si(2)S(14) (1), Al(0.50)Dy(3)(Si(0.50)Al(0.50))S(7) (2), Al(0.38)Dy(3)(Si(0.85)Al(0.15))S(7) (3), and Al(0.33)Sm(3)SiS(7) (4), crystallized in the chiral and polar space group P6(3), 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 (KTiOPO(4)), respectively. The calculated band structure of 1 implies that the optical absorptions of BLn(6)M(2)Q(14) and ALn(3)MQ(7) 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.
authors: State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China.
authors: Sheng-Ping
authors: SP
authors: Guo
authors: Guo-Cong
authors: GC
authors: Guo
authors: Ming-Sheng
authors: MS
authors: Wang
authors: Jian-Ping
authors: JP
authors: Zou
authors: Gang
authors: G
authors: Xu
authors: Guo-Jian
authors: GJ
authors: Wang
authors: Xi-Fa
authors: XF
authors: Long
authors: Jin-Shun
authors: JS
authors: Huang