Vibrational spectra, related properties, and structure of inorganic glasses

Efimov, Andrei M.

doi:10.1016/s0022-3093(99)00409-3

Cited by 105 publications

(72 citation statements)

References 61 publications

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“…Besides, the absorption bands that appear at 407-448 cm −1 are assigned to the vibrations of Te O Te groups, whereas the absorption bands that appear at 672-699 cm −1 are assigned to the vibrations of Te O groups. The strong absorption bands that appear at 3215-3424 cm −1 in these spectra are assigned to the vibrations of the unreacted OH moiety, respectively [19]. These values are consistent with those detected in a number of organotin(IV)-oxygen derivatives [20,21].…”

Section: Ir Spectrasupporting

confidence: 86%

Syntheses, Characterizations, Crystal structures, and Antitumor Activities of Arenetelluronic Triorganotin Esters

Zhang

et al. 2014

Heteroatom Chem.

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Section: Ir Spectrasupporting

confidence: 86%

Syntheses, Characterizations, Crystal structures, and Antitumor Activities of Arenetelluronic Triorganotin Esters

Zhang

et al. 2014

Heteroatom Chem.

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“…This result extends to the coordination of the boron atoms. According to Efimov's data [12] the bands in the high-frequency region (1150 -1500 cm -1 ) of the RS spectrum (see Fig. 2b ) and the IR spectrum (see Fig.…”

mentioning

confidence: 87%

Structure of lanthanum-borogermanate glass with stillwellite composition according to vibrational spectroscopy data

et al. 2010

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Translated from Steklo i Keramika, No. 4, pp. 9 -12, April, 2010. Dielectric IR spectroscopy and Raman scattering (RS) spectroscopy have been used to confirm the presence in the structure of lanthanum-borogermanate (LBG) glass of triply coordinated boron atoms which are absent in a LaBGe 5 crystal. The grouping ratio [BO 3 ]/[BO 4 ] is independent of the conditions under which the glass is obtained. It is proposed that amorphous nanosize regions of two types with approximately the same chemical composition but different structure are present in the glass. Regions of the first kind contain predominately quadruply coordinated boron atoms and are the basis for the formation of nuclei of stillwellite crystals, while regions of the second kind are more disordered, and a large fraction of the boron atoms in them lie at centers of oxygen triangles.Lanthanum-borogermanate glasses with compositions close to that of the ferroelectric LaBGeO 5 with stillwellite structure (LBG glass below) have been the objects of numerous studies for almost twenty years. This is because in these glasses it is possible to separate the LaBGeO 5 phase in the form of nanosize crystals [1], strong surface layers of oriented crystals [2], to obtain a quadratic optical nonlinearity in the transparent glass by means of thermal polarization [3], and to perfect crystalline textures possessing pyroelectric properties [4,5].In the last few years LBG glasses have become one of the most important base objects for the development of new technologies of hybrid optical materials based on controllable local crystallization of glass under the action of focused laser radiation. The laser radiation permits forming in LBG glass masses of closely spaced individual crystals with a practically monodisperse size distribution [6] and quasi-single-crystalline structure with complex geometry [7]. Thus, an entire series of promising polar glass-crystalline dielectrics can be obtained on the basis of LBG glasses with composition close to that of stillwellite. But if numerous experimental data have already been accumulated on glass formation in the LBG system and about the crystallization properties of LBG glasses, the information on their structure in the near and medium range scales is based mainly on ideas concerning the structural similarity of glasses and crystals with close compositions.In the case of exact correspondence between the glass and crystalline phase LaBGeO 5 , considering the ease of separating this phase in them, it is natural to suppose that short-range order in LBG glass is similar to short-range order in the crystal and that they form one and the same structural units [8]. However, data which do not fit into this model have appeared recently. In the crystal LaBGeO 5 coordination number of all boron atoms is 4, while according to the nuclear magnetic resonance (NMR) data [1] about half the boron atoms in LBG glass lie at the centers of triangles. This fact contradicts the principle of crystallochemical similarity, formulated and experimentally conf...

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“…According to the spectroscopic description of LaBGeO 5 [19,20], the bands in the high-frequency region 1150-1500 cm…”

Section: Ir Spectramentioning

confidence: 99%

Spectroscopic properties of Sm 3+ -doped lanthanum borogermanate glass

Rajaramakrishna

Knorr

Dierolf

et al. 2014

Journal of Luminescence

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a b s t r a c tUltraviolet-visible-near infrared (UV-vis-NIR) absorption and photoluminescence of (25 À x) La 2 O 3 -25B 2 O 3 -50GeO 2 glass series have been studied with different concentrations (x ¼0.1-1.0 wt%) of Sm 2 O 3 as an optically active dopant. The values of Judd-Ofelt (JO) parameters (Ω t ) follow the trend Ω 2 4Ω 4 4Ω 6 . Visible emission and decay times from the 4 G 5/2 level and its relative quantum efficiencies are measured. Intense reddish-orange emission corresponding to 4 G 5/2 -6 H 7/2 transition has been observed in these glasses under 488 nm excitation. A decrease in the quantum yield is observed with increasing Sm 3 þ ion concentration beyond 1% doping level.

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Vibrational spectra, related properties, and structure of inorganic glasses

Cited by 105 publications

References 61 publications

Syntheses, Characterizations, Crystal structures, and Antitumor Activities of Arenetelluronic Triorganotin Esters

Syntheses, Characterizations, Crystal structures, and Antitumor Activities of Arenetelluronic Triorganotin Esters

Structure of lanthanum-borogermanate glass with stillwellite composition according to vibrational spectroscopy data

Spectroscopic properties of Sm 3+ -doped lanthanum borogermanate glass

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