Structure and properties of potassium niobato-borophosphate glasses

Koudelka, Ladislav; Pospíšil, Jaroslav; Mošner, Petr; Montagne, Lionel; Delevoye, Laurent

doi:10.1016/j.jnoncrysol.2007.07.030

Cited by 28 publications

(24 citation statements)

References 11 publications

(25 reference statements)

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“…It can be then ascribed to the formation of mixed B(OP) 4Àx (OMo) x units. The formation of similar mixed units was observed previously in Nb 2 O 5 -doped borophosphate glasses [21]. The transformation of BO 4 units into BO 3 units in the present (100Àx)[0.5ZnO-0.1B 2 O 3 -0.4P 2 O 5 ]-xMoO 3 glasses is not so pronounced as in Nb 2 O 5 - [21] or TiO 2 -doped [22] borophosphate glasses.…”

Section: Discussionsupporting

confidence: 87%

“…The formation of similar mixed units was observed previously in Nb 2 O 5 -doped borophosphate glasses [21]. The transformation of BO 4 units into BO 3 units in the present (100Àx)[0.5ZnO-0.1B 2 O 3 -0.4P 2 O 5 ]-xMoO 3 glasses is not so pronounced as in Nb 2 O 5 - [21] or TiO 2 -doped [22] borophosphate glasses. This could be due to the presence of low-coordinated MoO 4 species, as shown by Raman data, in comparison with only NbO 6 and TiO 6 units formed in the other glasses.…”

Section: Discussionsupporting

confidence: 87%

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Structure and properties of MoO3-containing zinc borophosphate glasses

Šubčík¹,

Koudelka²,

Mošner³

et al. 2009

Journal of Non-Crystalline Solids

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a b s t r a c tZnO-B 2 O 3 -P 2 O 5 glasses doped with MoO 3 were investigated in the series (100Àx)[0.5ZnO-0.1B 2 O 3 -0.4P 2 O 5 ]-xMoO 3 , where bulk glasses were obtained by slow cooling in air within the compositional region of 0 6 x 6 60 mol% MoO 3 . The incorporation of MoO 3 into the parent zinc borophosphate glass results in a weakening of bond strength in the structural network, which induces a decrease in chemical durability and glass transition temperature. Raman spectra reflect the incorporation of molybdate groups into the glass network of the studied glasses by the presence of the polarized vibrational band at %976 cm À1 ascribed to the MO x symmetric stretching vibrations and the depolarized band at %878 cm À1 ascribed to the Mo-O-Mo stretching vibration. The incorporation of molybdate units into the glass network results in the depolymerization of phosphate chains and the formation of P-O-Mo bonds, as reflected in Raman and 31 P NMR spectra. According to the 11 B MAS NMR spectra, tetrahedral B(OP) 4Àx (OMo) x units are formed in the glasses, whereas only a small amount of BO 4 units is converted to BO 3 units in the MoO 3 -rich glasses.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 87%

Structure and properties of MoO3-containing zinc borophosphate glasses

Šubčík¹,

Koudelka²,

Mošner³

et al. 2009

Journal of Non-Crystalline Solids

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“…The band at 500-650 cm À1 is related to a three-dimensional network formed by slightly distorted [NbO 6 ] octahedra, whereas the peak at 880 cm À1 is assigned to vibrations of isolated [NbO 6 ] octahedra with NBO. [8][9][10][24][25][26] Finally, the sharp peak at 720 cm À1 is also associated to Nb-O vibrations in [NbO 6 ] octahedra. 30 Raman spectra of ternary bulk samples present a combination of the vibrational modes observed in the binary samples.…”

Section: Methodsmentioning

confidence: 94%

“…The coordination of Nb 5þ in oxide crystals is typically octahedral and rarely tetrahedral. 29 In the case of glasses most works assign the bands observed in Raman spectra to [NbO 6 ] octahedra, [8][9][10][24][25][26] although the existence of [NbO 4 ] has been proposed in the case of niobium germanate glasses. 28,30 Still, Nb-O bond lengths in [NbO 6 ] (2.0 Å ) and [NbO 4 ] (1.9 Å ) are so close that is extremely difficult to neatly assign Raman bands to modes associated to any of these units.…”

Section: Methodsmentioning

confidence: 99%

“…The structural analysis performed demonstrates the existence of two clear differences between bulk and film glasses that should be in the origin of the observed increase of /v (3) In the case of niobio-(boro)phosphate glasses, [8][9][10]24,25 the observed significant increase of the nonlinear response has been related to the formation of first two-dimensional (2D) and then three-dimensional (3D) associations of Nboxygenated sites by clustering of [NbO 6 ] octahedra as [Nb] increases. 7,9,10,26 Taking this into account along with the structural analysis made by Raman spectroscopy, it is possible to depict the evolution of the film glass structure as [Nb] F increases. At low [Nb] F (G10F, G1F), Nb acts as a glass modifier, as evidenced by the presence of isolated [NbO 6 ] with vibration bands at >800 cm À1 .…”

Section: A Evaluation Of the Nonlinear Response In The Frame Of Bgo mentioning

confidence: 99%

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Structural origin of the nonlinear optical properties of lead niobium germanate film glasses

Muñoz-Martín¹,

Cruz²,

Fernández-Navarro³

et al. 2011

Journal of Applied Physics

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Linear and nonlinear optical susceptibilities and hyperpolarizability of borate LiNaB4O7 single crystals: Theory and experiment J. Appl. Phys. 112, 053526 (2012) Effect of Lorentz local field for optical second order nonlinear susceptibility in ZnO nanorod J. Appl. Phys. 111, 103112 (2012) Size dependent optical properties of the CdSe-CdS core-shell quantum dots in the strong confinement regime J. Appl. Phys. 111, 074312 (2012) Methyl groups at dielectric and metal surfaces studied by sum-frequency generation in co-and counterpropagating configurations J. Chem. Phys. 135, 044704 (2011) The third-order nonlinear optical coefficients of Si, Ge, and Si1−xGex in the midwave and longwave infrared J. Appl. Phys. 110, 011301 (2011) Additional information on J. Appl. Phys. The structural origin of the nonlinear optical susceptibility (/v (3) /) of lead-niobium-germanate film glasses with large Nb 2 O 5 contents has been investigated. /v (3) / shows a strong enhancement with the Nb content in the films with /v (3) / values close to 2 Â 10 À11 esu at 800 nm for a Nb content as high as 0.71. Boling-Glass-Owyoung and Lines' semiempirical models predict accurately the values of /v (3) / for transparent bulk glasses but not for film glasses. This discrepancy is related to the remarkable structural differences between them. Raman spectroscopy suggests the formation of a three-dimensional (3D) structure of [NbO 6 ] octahedra in the case of film glasses having large Nb contents, while X-ray photoelectron spectroscopy shows that a significant fraction of these units contain Nb 4þ ions. The combination of a 3D structure of [NbO 6 ] with the presence of Nb 4þ polarons and their migration through electron intervalence transfer is proposed as the origin of the observed enhancement of /v (3) / in the film glasses.

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