Chemistry of Materials· 2026Q1
Investigating Nonlinear Optical and Thermal Properties in Sr2SiSe4 through Noncentrosymmetric Crystal Structure Comparison with Sr2SnSe4
- 1citations
- Q1SCImago
- 2026year
Short summary
Two new noncentrosymmetric ternary selenides, Sr2SiSe4 and Sr2SnSe4, were synthesized, with Sr2SiSe4 exhibiting a nonlinear optical intensity ~0.5x that of AgGaS2 and ultralow thermal conductivity (0.46 W m–1 K–1 at 523 K).
AI-generated from the title and abstract; the full text is not read.
Key points
- Two new noncentrosymmetric ternary selenides, Sr2SiSe4 and Sr2SnSe4, were synthesized.
- Sr2SiSe4 shows a nonlinear optical intensity ~0.5 times that of AgGaS2 at 2090 nm.
- Sr2SiSe4 possesses ultralow thermal conductivity of 0.46 W m–1 K–1 at 523 K.
- Both compounds have moderate band gaps (Sr2SiSe4: 2.31 eV, Sr2SnSe4: 2.05 eV) with infrared transparency.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract An isovalent anion substitution approach allowed for the discovery of two noncentrosymmetric ternary selenides, Sr2SiSe4 and Sr2SnSe4. Sr2SiSe4 crystallizes in the α-Eu2GeS4 type, monoclinic space group P21, with lattice parameters a = 6.8866(19) Å, b = 7.0062(19) Å, c = 8.520(2) Å, β = 108.200(6)°, and Z = 2, while Sr2SnSe4 adopts the γ-Sr2GeSe4 type, orthorhombic space group Ama2, with lattice parameters a = 10.4802(10) Å, b = 10.6965(10) Å, c = 7.5411(7) Å, and Z = 4. Calculated PBE band gaps show that Sr2SiSe4 (Eg = 2.31 eV) and Sr2SnSe4 (Eg = 2.05 eV) both exhibit a broad transparency window in the infrared region along with moderate band gaps, avoiding two-photon absorption from 2090 nm lasers. The nonlinear optical response of Sr2SiSe4 was experimentally determined using AgGaS2 as a reference, indicating that the material is phase-matchable, producing an intensity approximately 0.5 times that of AgGaS2 using a 2090 nm laser. In addition to its promising nonlinear optical properties, Sr2SiSe4 exhibits ultralow thermal conductivity (0.46 W m–1 K–1 at 523 K) despite being composed of rather light elements compared to Bi2Te3 and PbTe, making it an interesting─and less toxic─potential candidate for thermoelectric energy conversion applications.
The authors' abstract, as published at the source. Chemistry of Materials, 2026 · DOI ↗
Continue with a free account
Ask the paper: 3 free questions a day about this paper; save it, get its citation, new summaries every day for your field. Takeaways are Premium.
Continue free on the webSign in with Google or Apple; no card needed. You come back to this paper.
On your phone:
Field: Electronic, Optical and Magnetic Materials
Electronic, Optical and Magnetic MaterialsMaterials Science