2024
DOI: 10.1021/jacs.4c01740
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Hg4(Te2O5)(SO4): A Giant Birefringent Sulfate Crystal Triggered by a Highly Selective Cation

Peng-Fei Li,
Chun-Li Hu,
Ya-Feng Li
et al.

Abstract: Sulfate crystals are often criticized for their low birefringence. The small anisotropic SO 4 group is becoming the biggest bottleneck hindering the application of sulfates in optical functional materials. In this study, we report a new method to significantly enhance the birefringence of sulfates. The title compound increases the birefringence recording of sulfates to 0.542@546 nm, which is significantly larger than that of the commercial birefringent crystal of TiO 2 (0.306@546.1 nm). At the infrared wavelen… Show more

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Cited by 29 publications
(5 citation statements)
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“…Currently, we are pursuing two approaches to simultaneously improve the bandgap and birefringence of selenites. The first approach involves introducing SO 4 tetrahedral groups with a wide transmittance window, 31,32 exemplified by compounds like Hg 2 (SeO 3 )(SO 4 ) (0.133 @ 532 nm, 3.58 eV) 33 and Hg 3 (SeO 3 ) 2 (SO 4 ) (0.118 @ 546 nm, 4.70 eV). 34 Another approach involves the use of partially fluorinated metal oxide polyhedrons.…”
Section: Introductionmentioning
confidence: 99%
“…Currently, we are pursuing two approaches to simultaneously improve the bandgap and birefringence of selenites. The first approach involves introducing SO 4 tetrahedral groups with a wide transmittance window, 31,32 exemplified by compounds like Hg 2 (SeO 3 )(SO 4 ) (0.133 @ 532 nm, 3.58 eV) 33 and Hg 3 (SeO 3 ) 2 (SO 4 ) (0.118 @ 546 nm, 4.70 eV). 34 Another approach involves the use of partially fluorinated metal oxide polyhedrons.…”
Section: Introductionmentioning
confidence: 99%
“…31–34 The strategy has proven effective by reported oxides with large birefringence, such as the K 3 Nb 3 Ge 2 O 13 (0.196@546 nm), 35 Sn 2 B 5 O 9 Cl (0.196@546 nm), 36 and Hg 4 (Te 2 O 5 )(SO 4 ) (0.542@546 nm). 37 However, an unwanted red shift of the cutoff edge is always caused by these cations. 38–40 As a result, the strategy is not suitable to enhance the birefringence of UV, especially DUV optical materials.…”
Section: Introductionmentioning
confidence: 99%
“…Birefringent crystals are key materials used in the production of optical devices, including polarizers, optical isolators, circulators, and phase retarders. 1–7 Inorganic phosphate crystals, known for their short ultraviolet cutoff edges and good crystal growth habits, represent a classic optoelectronic material. 8–13 KDP (KH 2 PO 4 ) and KTP (KTiPO 4 ) are quintessential examples of phosphates, boasting significant application as nonlinear optical (NLO) materials.…”
Section: Introductionmentioning
confidence: 99%