MII2M3IIIF3(Te6F2O16) (MII = Pb, Ba; MIII = Al, Ga): New mixed anionic tellurites with isolated Te6 coplanar rings

Hg2(SeO3)(SO4): the first sulfate selenite with large birefringence explored from d10transition metal compounds

“…It has been reported that cations with stereochemically active lone-pair electrons, such as Sn 2+ , Pb 2+ , Se 4+ and Te 4+ , can play positive roles in the birefringence properties due to their strong anisotropy. 9–15 For example, an excellent birefringent crystal, α-SnF 2 , which exhibits a large birefringence (0.177 at 546 nm), a short UV cut-off edge and easy crystal growth at ambient temperature, was reported in 2020 by Pan's group. 16 Recently, our group reported a series of inorganic oxides with large birefringence and wide band gaps via the combination of tellurite groups and sulfate tetrahedra, 17 i.e.…”

Cation Substitution of Hexagonal Triple Perovskites: A Case in Trimetallic Tellurates A2A′BTe2O9

“…In the vacancy-ordered double perovskite semiconductor Cs 2 Sn 1– x Te x I 6 , Te­(IV) acts as B-site cation, and Te substitution increases the electronic dispersion . Besides, tellurites are suitable candidates as nonlinear optical materials. − For example, Li 7 (TeO 3 ) 3 F exhibits an SHG efficiency as large as three times of KDP and is phase-matchable …”

AAl(Te4O10) (A = Na, Ag) and K2Ga2(HTe6O16)(HTeO3): Three Aluminum/Gallium Tellurites with Large Birefringence and Wide Band Gap

“…The anionic framework of 3 exhibits a complex 3D structure composed of 1D gallium tellurite belts bridged by Ga1O 6 octahedra. The tellurite groups of Te1–Te6 are interconnected via O atoms to form an unprecedented Te 6 O 16 hexamer that is not closed, unlike the coplanar (Te 6 F 2 O 16 ) 10 – rings found in Pb 2 Ga 3 F 3 (Te 6 F 2 O 16 ) and the regular chair conformation (Te 6 O 18 ) 12– rings observed in (NH 4 ) 6 Mo 8 Te 8 O 43 ·H 2 O (Figures and S8). The Ga2O 5 polyhedra connected the Te 6 O 16 hexamers and Te7O 3 groups to a 1D gallium tellurite belt along the a axis.…”

“…45−48 Some compounds containing Ga 3+ have been reported to have large birefringence and wide band gap. 49 For example, the birefringence values of Nd 3 [Ga 3 O 3 S 3 ][Ge 2 O 7 ] (4.35 eV), 50 LiGaF 2 (IO 3 ) 2 (4.33 eV), 51 RbGaF 3 (IO 3 ) (4.61 eV), 52 and Ga 2 (TeO 3 )(SO 4 )(OH) 2 (4.23 eV) 23 at 1064 nm can reach 0.094, 0.181, 0.174, and 0.103, respectively. To obtain wideband-gap tellurite birefringent materials, we focused our energy on gallium/aluminum tellurite systems.…”