Syntheses, structures, and second-harmonic generating properties in new quaternary tellurites: A2TeW3O12 (A=K, Rb, or Cs)

LiMoO3(IO3): A new molybdenyl iodate based on WO3-type sheets with large SHG response

“…Previously, two molybdenum(VI) selenites A 2 (MoO 3 ) 3 (SeO 3 ) (A = Cs, NH 4 ) were reported to have layered structures built up from hexagonal WO 3 -type sheets of corner-sharing MoO 6 octahedra, with pyramidally coordinated Se atoms capped on one side of each sheet [18]; (NH 4 )(VO 2 ) 3 (SeO 3 ) 2 was found to have a similar layer of vanadium-centered octahedra, but in this material, both sides of the octahedral layers are capped by Se atoms [19]; materials based on hexagonal WO 3 -type sheets with SHG responses also include Cs 2 I 4 O 11 [20] and A 2 TeW 3 O 12 (A = Rb, Cs) [21]. However, the compounds based on the other forms of WO 3 -type sheets capped by anionic groups have not been observed except LiMoO 3 (IO 3 ) present here.…”

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

“…These crystals exhibit excellent multifunctional properties, including piezoelectricity, pyroelectricity, electro-optic and NLO properties [21][22][23]. Cs 2 TeW 3 O 12 (P6 3 ) reported by Halasyamani group in 2003 displays a two-dimensional layered structure composed of [TeW 3 O 12 ] 2 À anionic layers with Cs þ cations located at voids between the layers for charge balance [14,24]. Similar to Cs 2 TeMo 3 O 12 which is isostructural with Cs 2 TeW 3 O 12 , the dipole moments of TeO 3 polyhedra in Cs 2 TeW 3 O 12 also align in the same direction along the crystallographic c-axis, giving rise to the strong powder second-harmonic generation (400 Â SiO 2 ) [14,24,25].…”

Noncentrosymmetric Inorganic Oxide Materials: Synthetic Strategies and Characterisation Techniques

“…The lone-pair cation coordination environment may be considered as pre-distorted, [38] as these cations are almost always found in local NCS environments. Halasyamani et al, [38][39][40][41][42][43][44][45][46][47][48][49][50] Norquist et al, [51][52][53] and others [54][55][56][57][58][59][60][61][62][63] have used SOJT-distorted cations in the design and synthesis of new NCS materials.…”

“…These materials include Na 2 TeW 2 O 9 , [41] BaTeMo 2 O 9 , [43] K 2 TeW 3 O 12 , [64] TlSeVO 5 , [49] and (NH 4 ) 2 Te 2 WO 8 . [47] In doing so, they were able to increase the incidence of acentricity in any material to nearly 50%.…”