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Thermal properties and optical transition probabilities of Tm3 + doped TeO2-WO3 glass.

Identifieur interne : 000692 ( PubMed/Checkpoint ); précédent : 000691; suivant : 000693

Thermal properties and optical transition probabilities of Tm3 + doped TeO2-WO3 glass.

Auteurs : S. Cenk [Turquie] ; B. Demirata ; M L Oveçoglu ; G. Ozen

Source :

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy [ 1386-1425 ] ; 2001.

RBID : pubmed:11767831

Descripteurs français

KwdFr :
- Analyse thermique différentielle, Composés du tungstène (), Modèles chimiques, Spectrophotométrie IR, Tellure (), Thulium (), Verre ().
MESH :
- Analyse thermique différentielle, Composés du tungstène, Modèles chimiques, Spectrophotométrie IR, Tellure, Thulium, Verre.

English descriptors

KwdEn :
- Differential Thermal Analysis, Glass (chemistry), Models, Chemical, Spectrophotometry, Infrared, Tellurium (chemistry), Thulium (chemistry), Tungsten Compounds (chemistry).
MESH :
- chemical , chemistry : Tellurium, Thulium, Tungsten Compounds.
- chemistry : Glass.
- Differential Thermal Analysis, Models, Chemical, Spectrophotometry, Infrared.

Abstract

Glasses with the composition of (1 - x)TeO2 + (x)WO3, where x = 0.15, 0.25 and 0.3 were prepared and, their thermal and absorption measurements were carried out. Differential thermal analysis (DTA) curves taken in the 23-600 degrees C temperature range with a heating rate of 10 degrees C/min reveal a change in the value of the glass transition temperature, Tg, while crystallization was not observed for the glasses containing a WO3 content of more than 15 mol%. All the glasses were found to be moisture-resistant. The absorption bands corresponding to the absorption of the 1G4, 3F2, 3F3 and 3F4, 3H5 and 3H4 levels from the 3H6 ground level of the Tm3+ ion were observed in the optical absorption spectra. Integrated absorption cross-sections of each band except that of 3H5 level was found to vary with the glass composition. Judd-Ofelt analysis was carried out for the samples doped with 1.0 mol% Tm2O3. The omega2 parameter shows the strongest dependence on the host composition and it increases with the increasing WO3 amount. The value of omega4 increases rather slowly while the value of omega6 is practically independent of the composition. The strong dependence of the parameter omega2 indicates that this parameter is related to the structural change and the symmetry of the local environment of the Tm3+ ions in this glass.

PubMed: 11767831

Affiliations:

Turquie

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Glasses with the composition of (1 - x)TeO2 + (x)WO3, where x = 0.15, 0.25 and 0.3 were prepared and, their thermal and absorption measurements were carried out. Differential thermal analysis (DTA) curves taken in the 23-600 degrees C temperature range with a heating rate of 10 degrees C/min reveal a change in the value of the glass transition temperature, Tg, while crystallization was not observed for the glasses containing a WO3 content of more than 15 mol%. All the glasses were found to be moisture-resistant. The absorption bands corresponding to the absorption of the 1G4, 3F2, 3F3 and 3F4, 3H5 and 3H4 levels from the 3H6 ground level of the Tm3+ ion were observed in the optical absorption spectra. Integrated absorption cross-sections of each band except that of 3H5 level was found to vary with the glass composition. Judd-Ofelt analysis was carried out for the samples doped with 1.0 mol% Tm2O3. The omega2 parameter shows the strongest dependence on the host composition and it increases with the increasing WO3 amount. The value of omega4 increases rather slowly while the value of omega6 is practically independent of the composition. The strong dependence of the parameter omega2 indicates that this parameter is related to the structural change and the symmetry of the local environment of the Tm3+ ions in this glass.</div>
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<Abstract><AbstractText>Glasses with the composition of (1 - x)TeO2 + (x)WO3, where x = 0.15, 0.25 and 0.3 were prepared and, their thermal and absorption measurements were carried out. Differential thermal analysis (DTA) curves taken in the 23-600 degrees C temperature range with a heating rate of 10 degrees C/min reveal a change in the value of the glass transition temperature, Tg, while crystallization was not observed for the glasses containing a WO3 content of more than 15 mol%. All the glasses were found to be moisture-resistant. The absorption bands corresponding to the absorption of the 1G4, 3F2, 3F3 and 3F4, 3H5 and 3H4 levels from the 3H6 ground level of the Tm3+ ion were observed in the optical absorption spectra. Integrated absorption cross-sections of each band except that of 3H5 level was found to vary with the glass composition. Judd-Ofelt analysis was carried out for the samples doped with 1.0 mol% Tm2O3. The omega2 parameter shows the strongest dependence on the host composition and it increases with the increasing WO3 amount. The value of omega4 increases rather slowly while the value of omega6 is practically independent of the composition. The strong dependence of the parameter omega2 indicates that this parameter is related to the structural change and the symmetry of the local environment of the Tm3+ ions in this glass.</AbstractText>
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Thermal properties and optical transition probabilities of Tm3 + doped TeO2-WO3 glass.

Thermal properties and optical transition probabilities of Tm3 + doped TeO2-WO3 glass.

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

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Pour générer des pages wiki