Li₂CdGeSe₄and Li₂CdSnSe₄: biaxial nonlinear optical materials with strong infrared second-order responses and laser-induced damage thresholds influenced by photoluminescence

Abstract

Two new biaxial, diamond-like semiconductors, Li2CdGeSe4and Li2CdSnSe4, were preparedviahigh-temperature, solid-state synthesis.

Li2MnSnSe4: A New Quaternary Diamond‐Like Semiconductor with Nonlinear Optical Response and Antiferromagnetic Property

“…Interestingly, considering the bonding between the Li + and Se 2− ions, the MnSe 4 , SnSe 4 , and LiSe 4 tetrahedra form an open honeycomb‐like cellular structure (Figure B) with diameters of up to 5 Å (Figure C), which could enable some small ions and molecules to pass through, such as H 2 (2.89 Å), O 2 (3.46 Å), N 2 (3.64 Å), and SO 2 (4.1 Å), and be transported freely within the tunnel. Similar structural features also exist in other DLSs, like CdSe (6 Å), Li 2 CdSnS 4 (≈4 Å), and Li 2 CdSnSe 4 (≈5 Å) …”

“…Similar structuralf eatures also exist in other DLSs, likeC dSe (6 ), [12] Li 2 CdSnS 4 ( % 4 ), [7] and Li 2 CdSnSe 4 ( % 5 ). [13] Selected bond lengths of the titlec ompound are listed in the Supporting Information. The lengths of the LiÀSe bonds range from 2.51(10) to 2.59(3) ,w hicha re shorter than 2.64(3) to 2.83(3) in LiGaGe 2 Se 6…”

“…Compared with other metal chalcogenides classified as DLSs in the I 2 -II-IV-VI 4 systems, Li 2 MnSnSe 4 has as imilar unit cell to the Li-containing metal selenides that crystallize in the orthorhombic system, such as Li 2 CdMSe 4 (M = Ge, Sn), [13] however, the cell volume of Li 2 MnSnSe 4 (405.19 3 )i sc learly larger than these Li-containing metal sulfides due to the introduction of the larger Se atom, like Li 2 FeSnS 4 (341.7 3 ), [18] Li 2 MnSnS 4 (351.7 3 ), [19] and Li 2 MnGeS 4 (330.8 3 ). [20]…”

Phase equilibria in the Tl2S–HgS–SnS2 system at 520 K and crystal structure of Tl2HgSnS4

“…Most of them crystallize in tetragonal structures (space group (SG) I-4 (kesterite) or I-42m (stannite)), which are derivatives of the sphalerite structure, or orthorhombic structures, space group Pmn2 1 or Сmc2 1 , which are superstructures of wurtzite [1][2][3][4][5][6]. Additionally, 2-1-1-4 compounds form in the case of A I = Li (Li 2 CdGe(Sn)S 4 [7], Li 2 CdGe(Sn)Se 4 [8], SG Pmn2 1 ). Only two such compounds are known for B II = Pb, Cu 2 PbSiS 4 (SG P3 2 21) [9] and Ag 2 PbGeS 4 (SG Ama2) [10], whereas almost all possible variants are formed with B II = Mn, Fe, Co, Ni (SG I-42m and Pmn2 1 ) [11][12][13].…”

“…The non-linear optical parameters have been most thoroughly studied for lithium-containing compounds, which exhibit a high laser damage threshold (e.g. 0.7 GW•cm −2 for Li 2 CdGeSe 4 [8]). Compounds of this type are also of interest in photovoltaics, as the absorbing layer for thin-film solar cells [14,15].…”