Crystal structure, Raman spectrum and lattice dynamics of a new metastable form of tellurium dioxide: γ-TeO2

Champarnaud-Mesjard, J.C.; Blanchandin, S.; Thomas, Philippe; Mirgorodsky, A.P.; Merle-Méjean, Thérèse; Frit, B.

doi:10.1016/s0022-3697(00)00012-3

Cited by 197 publications

(192 citation statements)

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“…Crystal structure and optical properties of TeO 2 were the subjects of numerous theoretical and experimental studies [4,12]. Tellurium dioxide belongs to the category of compounds in which all the atoms are the so-called pelements, having non-bonding valence electron pairs [4].…”

Section: Introductionmentioning

confidence: 99%

Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures

Arshak

Korostynska

2002

Sensors

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Thin films of Tellurium dioxide (TeO2) were investigated for γ-radiation dosimetry purposes. Samples were fabricated using thin film vapour deposition technique. Thin films of TeO2 were exposed to a 60Co γ-radiation source at a dose rate of 6 Gy/min at room temperature. Absorption spectra for TeO2 films were recorded and the values of the optical band gap and energies of the localized states for as-deposited and γ-irradiated samples were calculated. It was found that the optical band gap values were decreased as the radiation dose was increased. Samples with electrical contacts having a planar structure showed a linear increase in current values with the increase in radiation dose up to a certain dose level. The observed changes in both the optical and the electrical properties suggest that TeO2 thin film may be considered as an effective material for room temperature real time γ-radiation dosimetry.

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Section: Introductionmentioning

confidence: 99%

Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures

Arshak

Korostynska

2002

Sensors

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“…Tellurium dioxide is polymorphic, with three reported crystalline forms at ambient pressure: the -form (Lindqvist, 1968), the -form (Beyer, 1967) and the -form (Champarnaud-Mesjard et al, 2000). Whereas the -and -forms can be found in nature as the rare minerals paratellurite and tellurite, respectively, the -form is synthetic and can usually be obtained as a polycrystalline material by recrystallizing TeO 2 glasses at low temperatures.…”

Section: Structure Descriptionmentioning

confidence: 99%

“…The previous structure determination of this modification was based on laboratory powder X-ray diffraction data [Champarnaud-Mesjard et al (2000). J. Phys.…”

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confidence: 99%

Redetermination of theγ-form of tellurium dioxide

Weil

2017

IUCr Data

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The crystal structure of γ-TeO2was redetermined on the basis of single-crystal X-ray diffraction data. The previous structure determination of this modification was based on laboratory powder X-ray diffraction data [Champarnaud-Mesjardet al.(2000).J. Phys. Chem. Solids,61, 1499–1507]. The current redetermination revealed all atoms with anisotropic displacement parameters, accompanied with a much higher accuracy and precision in terms of bond lengths and angles, and the determination of the absolute structure. The crystal structure consists of TeO4bisphenoids that combine through corner-sharing of all their oxygen atoms into a three-dimensional framework.

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“…Due to the relationship between the coordination geometry of the Te atoms and compositions, addition of Nb 2 O 5 , K 2 O, WO 3 glass modiers changes the coordination of Te from TeO 4 trigonal bipyramid (tbp) to a TeO 3 trigonal bipyramid (tp) through intermediate polyhedral TeO 3+1 unit [22,23]. Therefore, transition between the TeO 4 and TeO 3 microstructures is stressed by the shortening of one of the axial bond while one equatorial bond gets longer (TeO 3+1 polyhedra) when the glass modier increases [24,25].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Infrared and Raman Spectra of TeO₂-Nb₂O₅-TiO₂Glasses

Kabalcı

Gökçe

2014

Acta Phys. Pol. A

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X-ray diraction, infrared (IR), Raman spectroscopy and scanning electron microscope techniques have been used to investigate the microstructural properties of the glass materials. In this work, a new type of tellurite based optical glasses with TeO2/Nb2O5/TiO2 for dierent xNb2O5 (x = 5, 10, 15, and 20 mol.%) glass compositions at constant 5 mol.% TiO2 ratio were prepared. The eect of Nb2O5 contents on the structural unit of (95 − x)TeO2 (x)Nb2O55TiO2 glass network, and the intensity ratios of the Raman peaks were investigated. The results indicate that for dierent Nb2O5 content 5 to 20 mol.% in the glass system, three vibrational peaks around 650, 800, and 920 cm −1 which correspond to the structural bonding of the glass were observed in the range of 5002000 cmfor the IR spectra. Furthermore, from the Raman results a structural evolution was determined with the number of structural units such as [NbO6] 7− , TeO3+1 (polyhedra), TeO4 (trigonal bipyramids), TeO3 (trigonal pyramids) or TeO3+1 (polyhedra), and [NbO4] 3− for this ternary glass system.

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Crystal structure, Raman spectrum and lattice dynamics of a new metastable form of tellurium dioxide: γ-TeO2

Cited by 197 publications

References 12 publications

Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures

Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures

Redetermination of theγ-form of tellurium dioxide

Investigation of Infrared and Raman Spectra of TeO₂-Nb₂O₅-TiO₂Glasses

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Crystal structure, Raman spectrum and lattice dynamics of a new metastable form of tellurium dioxide: γ-TeO2

Cited by 197 publications

References 12 publications

Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures

Gamma Radiation Dosimetry Using Tellurium Dioxide Thin Film Structures

Redetermination of theγ-form of tellurium dioxide

Investigation of Infrared and Raman Spectra of TeO2-Nb2O5-TiO2Glasses

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Investigation of Infrared and Raman Spectra of TeO₂-Nb₂O₅-TiO₂Glasses