Spectroscopic and X-ray Diffraction Investigations into the Specific Features of Crystallization of Potassium Niobium Silicate Glasses

Алексеева, И. П.; Golubkov, V. V.; Дымшиц, О. С.; Жилин, А. А.; Петров, В. И.; Tsenter, M. Ya.

doi:10.1023/b:gpac.0000038702.00600.11

Cited by 23 publications

(28 citation statements)

References 21 publications

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“…On the other hand, the Raman band at 855 cm −1 in Figure 6a can be associated with niobate units with non-bridging oxygen atoms. The large bandwidth of this band is indicative of Nb-O stretching in distorted NbO 6 octahedra, and this may arise from their bonding to more silicate than niobate entities [45]. This proposed assignment is also supported by the available literature including reviews on Raman spectra of structurally well-defined niobate compounds [46,[51][52][53][54][55].…”

Section: Raman Spectroscopysupporting

confidence: 54%

“…Consequently, even relatively small numbers of Zr-O bonds in a silicate matrix are expected to show significant Raman signals. A similar effect is expected for the Nb-O bonds, since α(Nb 5+ )=0.262 Å 3 [42], so that both Zr-and Nb-containing structural entities will contribute strongly to the Raman spectra, even when only present in small amounts [44,45].…”

Section: Raman Spectroscopysupporting

confidence: 53%

“…This proposed assignment is also supported by the available literature including reviews on Raman spectra of structurally well-defined niobate compounds [46,[51][52][53][54][55]. For example, Cardinal et al [51,52] showed that the introduction of Nb 2 O 5 to borophosphate glasses leads to the formation of distorted isolated NbO 6 octahedra (900 cm −1 ), and for higher and are known to exist at low concentrations in silicate glasses [45,55]. Figure 7 shows the Raman spectra measured at selected points of the heat-treated (10 min at 890 ∘ C) VBK228…”

Section: Raman Spectroscopymentioning

confidence: 65%

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A multi technique study of a new lithium disilicate glass-ceramic spray-coated on ZrO2 substrate for dental restoration

Möncke¹,

Ehrt²,

Πάλλες³

et al. 2017

Biomedical Glasses

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A multi technique study of a new lithium disilicate glass-ceramic spray-coated on ZrO 2 2 2 substrate for dental restoration https://doi.org/10.1515/bglass-2017-0004 Received May 05, 2017 revised Jul 07, 2017; accepted Aug 09, 2017 Abstract: An alkali niobate-silicate veneer ceramic for ZrO 2 -based dental restoration was developed and characterized for its physical properties and structure. The properties were adjusted for dental applications. The new lithium disilicate glass-ceramic VBK (sold as cerafusion or LiSi) can easily be applied by spray coating to any individually formed ZrO 2 -matrix and needs only one final tempering treatment. The surface of the glass-ceramic is very smooth. The color of the already translucent glass-ceramic can be adjusted to that of individual natural teeth. The structure of the glass-ceramic was studied by XRD and Raman spectroscopy as a function of heat-treatment and of spatial variations within the material and at its interfaces. ToF SIMS, SEM and thermal analysis techniques were applied to investigate the crystallization behavior and surface-interface reactions. XRD and Raman spectroscopy identified different crystalline phases in the amorphous glass matrix including Li 2 Si 2 O 5 , Li 2 SiO 3 , NaxLi (1−x) NbO 3 and Na 3 NbO 4 . The Raman spectrum of the amorphous matrix is dominated by the vibrational activity of the highly polarizable niobate units with a prominent feature at 865 cm −1 , assigned to Nb-O stretching in NbO 6 octahedra, which have non-bridging oxygen atoms and are connected to the silicate matrix rather than to other niobate polyhedra.

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Section: Raman Spectroscopysupporting

confidence: 54%

Section: Raman Spectroscopysupporting

confidence: 53%

Section: Raman Spectroscopymentioning

confidence: 65%

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A multi technique study of a new lithium disilicate glass-ceramic spray-coated on ZrO2 substrate for dental restoration

Möncke¹,

Ehrt²,

Πάλλες³

et al. 2017

Biomedical Glasses

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“…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. 25,31 We have assumed in the present work an octahedral coordination for the band assignment based on previously published works. 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.…”

Section: Methodsmentioning

confidence: 99%

“…Finally, the excess of [NbO 6 ] would lead to the formation of a 3D-structure of [NbO 6 ] evidenced by a band at % 600 cm À1 at large [Nb] F. All these bands (450-500 cm À1 , % 600 cm À1 , 700-750 cm À1 , % 810 cm À1 ) are observed in the Raman spectra of the NPG film glasses, and thus from the Raman spectra alone is extremely difficult to completely discard the presence of [NbO 4 ]. 28,30,31 EXAFS or NMR complementary experiments would be required to determine unambiguously the presence of [NbO 4 ]. However, it must be noted that this does not affect the structure of film glasses having very large…”

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

confidence: 99%

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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Raman Spectroscopy of Glasses

Almeida

Santos

2015

Modern Glass Characterization

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Spectroscopic and X-ray Diffraction Investigations into the Specific Features of Crystallization of Potassium Niobium Silicate Glasses

Cited by 23 publications

References 21 publications

A multi technique study of a new lithium disilicate glass-ceramic spray-coated on ZrO2 substrate for dental restoration

A multi technique study of a new lithium disilicate glass-ceramic spray-coated on ZrO2 substrate for dental restoration

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

Raman Spectroscopy of Glasses

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