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Updated: Sep 18, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Rational design of large birefringence infrared oxychalcogenides via heteroanionic octahedron engineering
Xinyao Qi1, Haonan Liu1, Yujie Zhang1
1State Key Laboratory of Crystal Materials, Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystal, Tianjin University of Technology, Tianjin, 300384, China. liuhn@email.tjut.edu.cn.
Abstract:
To overcome low birefringence in IR chalcogenides caused by symmetric tetrahedra, we designed Ba3SnGe2O8S and Sr2SnGeO4S2. Notably, Sr2SnGeO4S2 features the first distorted [SnO2S4] heteroanionic octahedra reported in oxychalcogenides, enabling a remarkably enhanced birefringence of 0.134@1064 nm versus 0.020@1064 nm in Ba3SnGe2O8S, alongside large band gaps and broad IR transmission.
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