Glass formation, properties and structure of glasses in the TeO2ZnO system

Bürger, H.; Kneipp, Katrin; Hobert, H.; Vogel, W.; Kozhukharov, V.; Neov, S.

doi:10.1016/0022-3093(92)90020-k

Cited by 251 publications

(120 citation statements)

References 18 publications

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“…This behaviour derives from the high values of the spontaneous emission probabilities, which in turn are are not tetrahedral, but more distorted TeO 4 , TeO 3 + 1 and TeO 3 units [9], due to the presence of a lone pair on the tellurium atom. The fact that the BR model is adequate in describing the sites for Eu 3 + in such an unconventional oxide glass could indicate that the lanthanide ion tends to dictate the nature of its own environment regardless of the nature former, in agreement with the hypothesis that Ln 3 + ions form 'quasi-molecular complexes' in glasses [35].…”

Section: Discussionmentioning

confidence: 99%

“…Zinc tellurite glasses ZnO-TeO 2 have been extensively investigated using vibrational spectroscopy [9,10] and neutron diffraction [11]. It was found that the building units of these materials are TeO 4 groups, where the four oxygens are located at four vertices of a trigonal bipyramid, TeO 3 + 1 groups, which are similar to TeO 4 but with a long Te -O bond, and TeO 3 groups, where the oxygens are arranged at three vertices of a tetrahedron.…”

Section: Introductionmentioning

confidence: 99%

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Optical spectroscopy of lanthanide ions in ZnO–TeO2 glasses

Rolli

Gatterer

Wachtler

et al. 2001

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

128

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Zinc tellurite glasses of compositions 19ZnO-80TeO 2 -1Ln 2 O 3 with Ln= Eu, Er, Nd and Tm were prepared by melt quenching. The absorption spectra were measured and from the experimental oscillator strengths of the f f transitions the Judd-Ofelt parameters V u were obtained. The values of the V u parameters are in the range usually observed for oxide glasses. For Nd 3 + and Er 3 + , luminescence spectra in the near infrared were measured and the stimulated emission cross sections | p were evaluated for some laser transitions. The high values of | p , especially for Nd 3 + , make them possible candidates for optical applications. Fluorescence line narrowing (FLN) spectra of the Eu 3 + doped glass were measured at 20 K, and the energies of the Stark components of the 7 F 1 and 7 F 2 states were obtained. A crystal field analysis was carried out assuming a C 26 site symmetry. The behaviour of the crystal field ratios B 22 /B 20 and B 44 /B 40 agrees reasonably well with the values calculated using the geometric model proposed by Brecher and Riseberg. The crystal field strength at the Eu 3 + sites appears to be very low compared to other oxide glasses.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical spectroscopy of lanthanide ions in ZnO–TeO2 glasses

Rolli

Gatterer

Wachtler

et al. 2001

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

128

View full text Add to dashboard Cite

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“…Figure 4 shows the normalized reduced Raman spectra measured for the bulk glass, RTand AN-film glasses in the 250-900 cm -1 range. Raman spectra of similar bulk glasses have been previously reported and discussed [9,13,20,36], and thus here we compare them with the results obtained for the thin film glasses. Like in other tellurite glasses, the cut-off frequency of the optical phonon modes is ≈850 cm -1 , which reduces multiphonon relaxation of Er 3+ ions with respect to silica glasses (cut-off at ≈1100 cm -1 ) [6,8,9] and the spectra present the distinctive bands of tellurite glasses at 400-500 cm -1 (A), 600-700 cm -1 (B) and 700-800 cm -1 (C).…”

Section: Structure and Morphology Of Thin Film Glassesmentioning

confidence: 62%

“…Like in other tellurite glasses, the cut-off frequency of the optical phonon modes is ≈850 cm -1 , which reduces multiphonon relaxation of Er 3+ ions with respect to silica glasses (cut-off at ≈1100 cm -1 ) [6,8,9] and the spectra present the distinctive bands of tellurite glasses at 400-500 cm -1 (A), 600-700 cm -1 (B) and 700-800 cm -1 (C). [8,9,13,36]. We have analyzed the structural changes in the thin film glasses by deconvoluting the Raman spectra in three Gaussian bands (Table III).…”

Section: Structure and Morphology Of Thin Film Glassesmentioning

confidence: 99%

Er3+-doped fluorotellurite thin film glasses with improved photoluminescence emission at 1.53 µm

Morea

Miguel

Fernandez

et al. 2016

Journal of Luminescence

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Transparent oxyfluoride tellurite thin film glasses have been produced at room temperature by pulsed laser deposition in O 2 atmosphere from an Er-doped TeO 2 -ZnOZnF 2 bulk glass. Thin film glasses present high refractive index (n≥ 1.95) and good transparency (T≥ 80%) in the visible (λ> 400nm) and near infrared range. However, their photoluminescence (PL) performance at 1.5 µm is poor. Thermal annealing at moderate temperatures (T≤ 315 ºC), well below glass crystallization, increases the PL 2 intensity by more than one order of magnitude as well as the PL lifetime up to τ≈ 3.3 ms. Film glasses present a larger fraction of TeO 3 trigonal pyramids than the bulk glass and a very large OH -content. The structure and composition of film glasses does not change upon annealing and thus the activation of the PL response is related to the improvement of the surface morphology and the significant decrease of their OHcontent.

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“…Almost all past studies of the ZnO-TeO 2 glass system were concerned with glass formation and structure-property. [4][5][6] Recently, Nukui et al 7) reported the thermal behavior, including crystallization, of the ZnO-TeO 2 glass system. Unfortunately, there is a lack of data in the literature.…”

Section: Introductionmentioning

confidence: 99%

<I>In Situ</I> High-Temperature X-ray Observations of Crystallization of Zinctellurite Glass

et al. 2002

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A reliable fabrication process of non-silica glasses is required to suppress crystallization. The crystallization behavior of zinctellurite (ZnO-TeO 2 ) glass at different rates of heating and cooling were studied by an in situ high-temperature X-ray diffractometer (a rapid measurement system) and differential thermal analysis (DTA). The DTA results compared with the X-ray diffraction data resulted in crystallization and phase relations, during heating and cooling, of the glass. During the heating process, α-TeO 2 and ZnTeO 3 were found to crystallize first, followed by the crystallization of Zn 2 Te 3 O 8 . While during the cooling process from melt, α-TeO 2 was found to crystallize first, followed by the crystallization of Zn 2 Te 3 O 8 . The present study results in reliable data of the crystallization process and presents a possibility of an approach to make accurate T-T-T diagram which can show the crystallization tendency.

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Glass formation, properties and structure of glasses in the TeO2ZnO system

Cited by 251 publications

References 18 publications

Optical spectroscopy of lanthanide ions in ZnO–TeO2 glasses

Optical spectroscopy of lanthanide ions in ZnO–TeO2 glasses

Er3+-doped fluorotellurite thin film glasses with improved photoluminescence emission at 1.53 µm

<I>In Situ</I> High-Temperature X-ray Observations of Crystallization of Zinctellurite Glass

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