Heteroanion-introduction-driven birefringence enhancement in oxychalcogenide Ba₃M^IIGe₃O₂S₈ (M^II = Mn, Cd)

Abstract

Birefringent crystals play a crucial role in regulating the polarization of light and are widely used in optoelectronic fields. However, the effective design of novel infared (IR) birefringent crystals with...

Partial substitution with a significant effect: coexistence of a wide band gap and large birefringence in the oxychalcogenide AEGe2O4Se (AE = Sr and Ba)

“…Secondly, we have observed that the [GeO x Q 4− x ] FBUs tend to exist largely independently within oxythiogermanate compounds. A notable exception to this trend is the compound Ba 3 M II Ge 3 O 2 S 8 (M II = Mn, Cd), 29 in which we have recently discovered the coexistence of [GeOS 3 ] and [GeO 2 S 2 ]. This simultaneous presence of different motifs is a relatively rare phenomenon within the context of [GeO 4 ]/[GeQ 4 ] and [GeO x Q 4− x ] FBUs.…”

Pentanary Oxythiogermanates Ba3MGe3O2S8 (M = Ca, Zn) Featuring [Ge3O2S8]8– Trimers and {[MGe3O2S8]6–}∞ Chains: Structural Chemistry and Physical Properties

“…In other words, it is difficult to change the structures of these compounds under external forces and other factors. 29 Very recently, Lin et al reported two pentanary oxysulfides during our preparation of this manuscript, namely, Ba 3 M II Ge 3 O 2 S 8 (M II = Mn, Cd), 30 which have chemical compositions similar to those of 1 and 2. Ba 3 CdGe 3 O 2 S 8 (3) crystallizes in monoclinic P2 1 /n, different from orthorhombic Pnma for 1 and 2.…”

Rare-earth-based chalcogenides and their derivatives: an encouraging IR nonlinear optical material candidate

“…215–228 This leads to distortions and the display of significant static dipole moments and anisotropy. 229–233 Unlike traditional chalcogenides, the presence of heteroanionic groups combines the high polarizability of chalcogenides with the advantages of oxides and halides that have wide E g . RE-based chalcohalides and oxychalcogenides not only incorporate disparate anions but also feature the presence of salt-inclusion compounds.…”