Sb₂(TeO₄)(SO₄): An Anhydrous Tellurite Sulfate with Large Birefringence and Enhanced Thermal Stability

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

The birefringence of birefringent materials is positively correlated with structural anisotropy. By introducing 5s2-electron-containing Sb3+ and Te4+ cations into a sulfate system, the anhydrous antimony tellurite Sb2(TeO4)(SO4) was obtained. Due to stereochemically active lone pairs (SCALPs), both are four-coordinated O atoms form distorted seesaw-shaped units. Benefiting from strong polarizability anisotropy polyhedra, exhibits large birefringence, as well wide transparency range high thermal stability, making compound potential UV material. Structural theoretical calculations indicate that optical properties mainly originate highly SO4 TeO4 units their uniform alignment. This work will provide some useful insights development SCALP-cation-based crystals.

Language: Английский

La₂Zn₃(SeO₃)₆: A UV Selenite Crystal with Second-Harmonic Generation and Large Birefringence

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 1, 2025

Inorganic selenites are promising candidates for nonlinear optical and birefringent crystals. However, that can effectively transmit in the UV region still relatively scarce. In this study, we successfully synthesized first Zn-based selenite with properties using a hydrothermal method by introducing Zn2+ La3+ ions, which cause blue shift compound's bandgap, into system. The compound crystallizes chiral space group P3112 presents unique three-dimensional structure composed of two-dimensional zinc layers bridged LaO10 polyhedra. Notably, possesses wide bandgap (5.0 eV), high birefringence (0.092 at 546 nm), excellent thermal stability (∼540 °C), broad transparency window (0.21-6 μm), apparent SHG efficiency (0.2 × KDP). Our work not only demonstrates great potential as crystals but also expands research scope materials.

Language: Английский

Recent progress in structural design strategies of high-birefringence optical crystals

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 540, P. 216775 - 216775

Published: May 8, 2025

Language: Английский