Crystal growth and anisotropic thermal properties of the nonlinear and polar oxide Cs2TeW3O12

Li7(TeO3)3F: A Lithium Fluoride Tellurite with Large Second Harmonic Generation Responses and a Short Ultraviolet Cutoff Edge

“…The relevant Te–O bond distances range from 1.852(6) to 1.870(5) Å, and the O–Te–O bond angles fall in the range of 98.4(2)–99.8(2)°. These angles and distances are close to those reported in other metal tellurites. − Li(2) ion is tetrahedrally coordinated by four O atoms with Li–O bond lengths of 1.937(12)–1.99(3) Å. Li(1) and Li(3) ions are also in a distorted tetrahedral geometry, but each is coordinated by three oxygen atoms and one F – (Figure S2). The Li(1)–O bond lengths are in the range of 1.947(11)–2.015(13) Å, and three Li(3)–O distances are equal to 1.956(14) Å.…”

“…Inorganic nonlinear optical (NLO) materials play a crucial role in expanding the spectral range of solid-state laser through frequency conversion technology, owing to their excellent NLO properties, such as large nonlinear coefficients, wide transparent windows, good thermal and chemical stabilities, and so forth. − Among them, metal selenites and tellurites are more likely to form non-centrosymmetric (NCS) structure as the prerequisite of second-harmonic generation (SHG) property, due to the stereochemically active lone pairs on Se 4+ or Te 4+ cation susceptible to second-order Jahn–Teller (SOJT). During the past two decades, through the combination of distorted octahedrally coordinated d 0 transition metal with Se 4+ and Te 4+ cations, a large number of compounds with excellent SHG properties have been discovered, such as β-BaTeMo 2 O 9 (600 × α-SiO 2 ), Na 2 TeW 2 O 9 (500 × α-SiO 2 ), , Cs 2 TeW 3 O 12 (400 × α-SiO 2 ), − and A 2 (MoO 3 ) 3 ­(SeO 3 ) (A = Tl, NH 4 ) (400 × α-SiO 2 ) . Nonetheless, the majorities of them are of small band gaps ( E g ) and complex chemical compositions, which hinder their applications in UV–visible region; also, their bulk single-crystal growths are difficult.…”

K6ACaSc2(B5O10)3 (A = Li, Na, Li0.7Na0.3): Nonlinear-Optical Materials with Short UV Cutoff Edges

“…The mixture of NaK 6 CaSc 2 (B 5 O 10 ) 3 , K 2 CO 3 , B 2 O 3 , and LiF at the ratio of 1:1:2:3 was heated to 880 °C, held for 1 day, and then cooled slowly (1 °C/h) to 840 °C. Here a platinum wire was employed for the seed crystal growth, which was then introduced into the saturation solution (determined by the method described in ref ) at a 10 rpm rotation rate. Subsequently, the single crystal was grown through cooling at a 0.3 °C/day rate until the considerable crystal size was formed.…”