Issue 22, 2021

Ba2Ge2Te5: a ternary NLO-active telluride with unusual one-dimensional helical chains and giant second harmonic-generation tensors

Abstract

Non-centrosymmetric (NCS) metal chalcogenides are candidates for promising nonlinear optical (NLO) crystals in infrared (IR) bands. However, most research has been focused on sulfides and selenides, with few studies focused on tellurides. For the first time, we systematically investigated the linear-optical and NLO properties of a ternary NLO-active telluride, Ba2Ge2Te5, at the experimental and theoretical levels. It adopts the NCS space group of Pna21 (no. 33) and features an unusual one-dimensional helical chain of [Ge2Te5]4− separated by Ba2+. Ba2Ge2Te5 exhibits a suitable birefringence (Δn) of 0.07, and a giant NLO coefficient d33 of 286.8 pm V−1 at a wavelength of 2050 nm (∼0.61 eV), much larger than that of the reference AgGaS2 (18.2 pm V−1). This work indicates that ethane-like [Ge2Te6] is an instructive NLO-active functional group that can be used to design novel and promising IR-NLO materials.

Graphical abstract: Ba2Ge2Te5: a ternary NLO-active telluride with unusual one-dimensional helical chains and giant second harmonic-generation tensors

Supplementary files

Article information

Article type
Research Article
Submitted
09 8 2021
Accepted
17 9 2021
First published
18 9 2021

Inorg. Chem. Front., 2021,8, 4838-4845

Ba2Ge2Te5: a ternary NLO-active telluride with unusual one-dimensional helical chains and giant second harmonic-generation tensors

M. Ran, Z. Ma, X. Wu, H. Lin and Q. Zhu, Inorg. Chem. Front., 2021, 8, 4838 DOI: 10.1039/D1QI01012C

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