Synthesis, Structure, and Characterization of a New Second-Harmonic-Generating Tellurite:  Na2TeW2O9

Goodey, Joanna; Broussard, Jake; Halasyamani, P. Shiv

doi:10.1021/cm020087i

Cited by 216 publications

(179 citation statements)

References 45 publications

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“…[38,39] We found that the local dipole moment of the BO 4 tetrahedra in Cs 2 B 4 SiO 9 is 7.44 Debye, which is much larger than that of other reported materials (0.005-0.727 Debye). [40] They are also larger than those of Cs1O 10 The electronic structure was studied by first-principle calculations.…”

Section: +mentioning

confidence: 54%

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

et al. 2013

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The generation of deep-ultraviolet (UV) coherent light from nonlinear optical (NLO) materials [1][2][3][4] as one of the most promising resource, has become a topic of intensive study because of its important applications in a broad range of fields, such as semiconductor photolithography, laser micromachining, photochemical synthesis, and material processing. They are able to shorten the wavelength of light by a factor of two (or doubling the frequency), based on the process of second-harmonic generation (SHG), which occurs only when a centrosymmetric symmetry operation is absent in a crystal. However, for a noncentrosymmetric (NCS) crystal to be used as a nonlinear optical material the essential crystal property requirements are that the crystals possess a large NLO response, wide transparent window, suitable birefringence for phase-matching, good mechanical strength, and chemical stability. [4,5] After continuous efforts over several decades, many NCS compounds were obtained by incorporating functional borate structure units, such as B 3 O 6 and B 3 O 7 . b-BaB 2 O 4 (BBO) [6] and LiB 3 O 5 (LBO) [7] are the most advanced NLO materials, which have widely been used as optoelectronic devices. However, to date, KBe 2 BO 3 F 2 (KBBF) [8,9] is the only material that can generate coherent light wavelengths below 200 nm by direct SHG, which makes KBBF a research hotspot. Unfortunately, the KBBF crystal is very difficult to grow in thickness owing to the growth habit of the layer, which severely limits the coherent light output power. Thus, finding the optimal composition that is facile to synthesize, yields large single crystals, and simultaneously satisfies the NLO requirements has attracted considerable attention. [10,11] The presence of large NLO coefficients in a structure is usually in contradiction with wide band gaps in one compound. For instance, the structural units in the known compounds are second-order Jahn-Teller (SOJT) polar dis- [17] which combine with diverse other functional building units to produce materials with large NLO coefficients, for example, Cd 4 BiO-(BO 3 ) 3 (6 KDP), [18] Pb 2 B 5 O 9 I (13.5 KDP), [19] and Ba 23 Ga 8 Sb 2 S 38 (22 AgGaS 2 ).[20] However, the structural units produce an unwanted effect-the UV absorption edge shifts toward the red region, making them less suitable for the deep-UV applications. It is necessary to create the subtle balance of above-mentioned conflicting factors so as to search for the new deep-UV NLO crystals with excellent comprehensive performances.To circumvent the wide absorption window requirement, basic structural units having excitation energies near the UV region are necessary. Such units are BO 3 , BO 4 , SiO 4 , and PO 4 . [6,7,21] A compound Rb 2 Be 2 Si 2 O 7 [22] was ever expected to be a substitution for KBBF owing to its similar structure characteristics with KBBF and without the layer habit. But, the weak SHG response of Rb 2 Be 2 Si 2 O 7 makes the substitution end in naught. However, the borosilicate may be a potential candidate for a deep-...

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Section: +mentioning

confidence: 54%

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

et al. 2013

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“…[26] A detailed description of the measurement was reported earlier. [27] Cs 2 I 4 O 11 has an SHG efficiency of approximately 300 SiO 2 . This efficiency is comparable to other NCS iodates, including HIO 3 (300 SiO 2 ), [26] LiIO 3 (300 SiO 2 ), [26] NdMoO 2 (IO 3 ) 4 (OH) (350 SiO 2 ), [28] and AMoO 3 (IO 3 ) (A = Rb or Cs, 400 SiO 2 ).…”

Section: +mentioning

confidence: 99%

“…We have previously published a structural model that allows us to calculate hd eff i calcd on the basis of metaloxygen bond hyperpolarizabilities b(MÀO). [27] With Cs 2 I 4 O 11 ,…”

Section: +mentioning

confidence: 99%

The Lone‐Pair Cation I⁵⁺ in a Hexagonal Tungsten Oxide‐Like Framework: Synthesis, Structure, and Second‐Harmonic Generating Properties of Cs₂I₄O₁₁

2004

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Noncentrosymmetric (NCS) oxides exhibit a variety of technologically important properties including ferroelectricity, piezoelectricity, pyroelectricity, and second-order nonlinear optical behavior. [1][2][3] The rational design of new NCS materials, however, remains a challenge, although a number of strategies have been suggested. [4][5][6][7][8][9] We have focused on synthesizing materials containing cations with lone pairs (e.g., Sb 3+ , Se 4+ , Te 4+, etc.) in order to increase the incidence of NCS in any new compound. [10,11] A structural topology that is often observed in NCS is the hexagonal tungsten oxide (HTO) framework. This structure has been reported for a variety of cations, including V 5+ , Mo 6+ , W 6+, and Sb 5+. [12][13][14][15][16][17][18] The framework consists of corner-sharing MO6 = 2 octahedra that are linked to form an array of three-and six-membered rings. [20-24] The IO 5 and IO 3 polyhedra share corners to form the layered structure. In connectivity terms, the layer can be described as a [3(2À anion, with charge balance attained by two Cs + cations. One of the most novel aspects of the structure is the twodimensional IO 5 layer (Figure 1). The HTO-like layer consists of six-membered rings containing corner-sharing IO 5 polyhedra in alternating orientation as one proceeds around the ring. Cs 2 I 4 O 11 is the first example of a lone-pair cation in a HTO-like topology. In the rings themselves, three lone pairs point inward and three outward. Thus, the lone pairs and oxide anions alternate around the ring. The lone pairs have two important structural consequences. First, the local dipole moment on each IO 5 polyhedron is in the direction of the lone pair. If we sum all of the dipole moments with respect to the IO 5 group, the resultant moment is zero. In other words, there is complete cancellation of the dipole moments with respect to the IO 5 polyhedra, that is, the IO 5 layer is pseudocentrosymmetric. This type of pseudocentrosymmetric layer was observed previously in Rb 2 TeW 3 O 12 and Cs 2 TeW 3 O 12 .[17] The cancellation is relevant to the SHG efficiency. Second, the Cs + cations are not coplanar with the IO 5 ring, attributable to the lone pairs. As shown in Figure 2, the Cs + cations sit above and below the rings. The environments of the Cs + cations influence any possible ion-exchange capabilities of the material.[25] The IO 5 layer is capped on one side by an asymmetric three-coordinate I 5+ cation, that is, an IO 3 group (see Figure 3). Alignment of the IO 3 polyhedra in the [001] direction results in an NCS and polar structure. The lone pairs associated with the IO 3 polyhedra also point along the [001]

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“…The particle size dependence on SH intensity shown in Fig. 5 reveals that the Gd x Bi 1Kx BO 3 phase has a phase matchable character [19].…”

Section: Surface Crystallization and Second Harmonic Generationmentioning

confidence: 88%

Surface crystallization and second-order optical non-linearity in Gd₂O₃–Bi₂O₃–B₂O₃glasses

Ihara

Benino

Fujiwara

et al. 2005

Science and Technology of Advanced Materials

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Some ternary Gd 2 O 3 -Bi 2 O 3 -B 2 O 3 glasses are prepared, and crystallization behavior and second harmonic intensity are examined to develop new non-linear optical crystallized glasses. The glasses with Gd 2 O 3 contents of 8-14 mol% have large densities of over 6 g/cm 3 and large refractive indices of w1.9. Transparent surface crystallized glasses consisting of two kinds of crystalline phases with different morphologies, i.e. plate shape and needle shape crystals, are fabricated by heat-treatment at temperatures between glass transition and crystallization temperatures. From second harmonic generation microscope observations, micro-Raman scattering spectra and XRD analyses, plate shape crystals are determined to be non-linear optical Gd x Bi 1Kx BO 3 and needle shape crystals are Bi 3 B 5 O 12 having no second-order optical non-linearity. Since crystallized glasses consisting of Gd x Bi 1Kx BO 3 crystals exhibit relatively strong SHGs, they have a high potential for application to light control devices.

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Synthesis, Structure, and Characterization of a New Second-Harmonic-Generating Tellurite: Na₂TeW₂O₉

Cited by 216 publications

References 45 publications

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

The Lone‐Pair Cation I⁵⁺ in a Hexagonal Tungsten Oxide‐Like Framework: Synthesis, Structure, and Second‐Harmonic Generating Properties of Cs₂I₄O₁₁

Surface crystallization and second-order optical non-linearity in Gd₂O₃–Bi₂O₃–B₂O₃glasses

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Synthesis, Structure, and Characterization of a New Second-Harmonic-Generating Tellurite: Na2TeW2O9

Cited by 216 publications

References 45 publications

Cs2B4SiO9: A Deep‐Ultraviolet Nonlinear Optical Crystal

Cs2B4SiO9: A Deep‐Ultraviolet Nonlinear Optical Crystal

The Lone‐Pair Cation I5+ in a Hexagonal Tungsten Oxide‐Like Framework: Synthesis, Structure, and Second‐Harmonic Generating Properties of Cs2I4O11

Surface crystallization and second-order optical non-linearity in Gd2O3–Bi2O3–B2O3glasses

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Synthesis, Structure, and Characterization of a New Second-Harmonic-Generating Tellurite: Na₂TeW₂O₉

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

Cs₂B₄SiO₉: A Deep‐Ultraviolet Nonlinear Optical Crystal

The Lone‐Pair Cation I⁵⁺ in a Hexagonal Tungsten Oxide‐Like Framework: Synthesis, Structure, and Second‐Harmonic Generating Properties of Cs₂I₄O₁₁

Surface crystallization and second-order optical non-linearity in Gd₂O₃–Bi₂O₃–B₂O₃glasses