Issue 20, 2024

A chiral sodium lanthanum sulfate for second-order nonlinear optics and proton conduction

Abstract

Chiral metal sulfates have demonstrated potential applications in various areas such as ferroelectricity and nonlinear optics (NLO) due to their non-centrosymmetric structural features. However, the synthesis of chiral metal sulfates remains a formidable challenge, as tuning the polarizability and anisotropy of the highly symmetric tetrahedral sulfate group is particularly difficult. In this context, we have rationally synthesized a chiral sodium lanthanum sulfate, NaLa(SO4)2(H2O), through the combination of alkali and rare-earth cations. The compound exhibits NLO response with a short absorption cutoff edge (<192 nm). Theoretical calculations suggest that the NLO response mainly originates from the synergistic cooperation of [LaO9] polyhedra and [SO4] tetrahedra. Furthermore, NaLa(SO4)2(H2O) may potentially achieve birefringence phase matching, as predicated by high birefringence (0.13 @ 1064 nm) in theoretical calculations. Additionally, NaLa(SO4)2(H2O) shows a high proton conductivity of 3.22 × 10−3 S cm−1 under 85 °C and 98% relative humidity. The complementary cation strategy of this work offers a new paradigm for the controllable synthesis of chiral metal sulfates and development of functional materials.

Graphical abstract: A chiral sodium lanthanum sulfate for second-order nonlinear optics and proton conduction

Supplementary files

Article information

Article type
Research Article
Submitted
07 Jul 2024
Accepted
29 Aug 2024
First published
30 Aug 2024

Inorg. Chem. Front., 2024,11, 7026-7033

A chiral sodium lanthanum sulfate for second-order nonlinear optics and proton conduction

H. Fu, X. Zhang, P. Liu, B. Li, B. Wu, Y. Tao, Q. Lu, Y. Li, J. Huang, F. Zhang, T. He, Z. Chen, H. Wang, C. Su, H. Zang, X. Yu and X. Li, Inorg. Chem. Front., 2024, 11, 7026 DOI: 10.1039/D4QI01708K

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