Dynamics and structure of TeO 2 polymorphs: model treatment of paratellurite and tellurite; Raman scattering evidence for new γ- and δ-phases

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

doi:10.1016/s0022-3697(99)00263-2

Cited by 165 publications

(154 citation statements)

References 18 publications

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“…Notably, the structural motif of the inorganic Te atoms cannot be found in the crystal structures of a-and b-TeO 2 , which adopt distorted trigonal bipyramidal arrangements. [20] We speculate that similar square pyramidal Te sites might also be present in alkali tellurite glasses (M 2 O) x A C H T U N G T R E N N U N G (TeO 2 ) 1Àx (M = Li, Na, K; 0.10 < x < 0.35). [5] The inorganic Te atoms comprise a four-membered Te 2 O 2 ring and the Te À O bond lengths also cover a rather large range from 1.92(1) to 2.24(1) , with the average of 2.06(1) being slightly longer than those of a-TeO 2 (av.…”

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confidence: 87%

Intramolecularly Coordinated Telluroxane Clusters and Polymers

Beckmann

Bolsinger

Duthie

2010

Chemistry A European J

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The stoichiometrically controlled chlorination of the diarylditelluride (8-Me(2) NC(10) H(6) Te)(2) with SO(2) Cl(2) afforded the aryltellurinyl chloride 8-Me(2) NC(10) H(6) TeCl (1) and the aryltellurium trichloride 8-Me(2) NC(10) H(6) TeCl(3) (2). Alternatively, 1 was obtained by the reaction of the aryltellurenyl diethyldithiacarbamate 8-Me(2) NC(10) H(6) Te(S(2) CNEt(2) ) with hydrochloric acid. The base hydrolysis of 2 provided the novel telluroxanes (8-Me(2) NC(10) H(6) Te)(2) OCl(4) (3), (8-Me(2) NC(10) H(6) Te)(6) O(5) Cl(8) (4), (8-Me(2) NC(10) H(6) Te)(6) O(8) Cl(2) (5), [(8-Me(2) NC(10) H(6) Te)(2) O(3) ](n) (6) and (8-Me(2) NC(10) H(6) Te)(6) O(8) (OH)(2) (7) depending on the reaction conditions applied. The reaction of 7 with ClTe(OiPr)(3) in the presence of water gave rise to the telluroxane (8-Me(2) NC(10) H(6) Te)(6) Te(2) O(12) Cl(2) (8). The crystal and molecular structures of 1-3 and 5-8 were determined by X-ray crystallography. The telluroxane clusters and polymers 6-8 hold potential as model compounds for alkali tellurite glasses (M(2) O)(x) (TeO(2) )(1-x) (M=Li, Na, K) for which no precise structural data are available.

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confidence: 87%

Intramolecularly Coordinated Telluroxane Clusters and Polymers

Beckmann

Bolsinger

Duthie

2010

Chemistry A European J

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“…The structure of TeO 2 crystalline consists of trigonal di-pyramids (tdp) TeO 4 . Figure 12 shows a tdp: the equatorial plane is occupied by the alone pair of electrons (5s-electrons) of the tellurium atom and two atoms of oxygen O eq -Te-O eq , and in the axial positions are occupied by two atoms of oxygen O ax -Te-O ax [17]. X-ray and neutron diffraction structural studies have shown that the atomic arrangement in glassy TeO 2 may be well described as a three-dimensional network of TeO 4 tdp [18,19].…”

Section: Luminescent Glassesmentioning

confidence: 99%

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

Cornejo¹

2016

Luminescence - An Outlook on the Phenomena and Their Applications

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This chapter focuses on the study on luminescent materials, which consist of oxide compounds (host material) and rare earth ions (as the activator) in the valence state, mostly 3+. The first part begins with a background study about the luminescence phenomenon, its stages, and the configurational coordinate diagram. Then, we review the notation often used for rare earth ions, such as the term symbols associated with the energy levels of the ground state. Lastly on the first part, we establish a relationship between the configurational coordinate model and the electronic transitions of such ions. The second part shows the photoluminescence results in some oxide compound materials doped with rare earth ions that have been reported in research articles with potential applications.

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“…Mallawany and Silva et al [18,19] reported that TeO 2 crystallizes in two dierent phases called α-TeO 2 (paratellurite, tetragonal) and β-TeO 2 (tellurite, orthorhombic), which have been known to be stable phases [8]. Additionally, Mirgorodsky et al [20] and Blanchandin et al [21] pointed out that TeO 2 may also form two metastable crystalline phases called γ-TeO 2 (orthorhombic) and δ-TeO 2 (cubic). In order to understand the thermal stability against crystallization, structural behavior in the mechanism in the glass transition region is important as a new type of nonlinear materials [20,21].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, Mirgorodsky et al [20] and Blanchandin et al [21] pointed out that TeO 2 may also form two metastable crystalline phases called γ-TeO 2 (orthorhombic) and δ-TeO 2 (cubic). In order to understand the thermal stability against crystallization, structural behavior in the mechanism in the glass transition region is important as a new type of nonlinear materials [20,21].…”

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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Dynamics and structure of TeO 2 polymorphs: model treatment of paratellurite and tellurite; Raman scattering evidence for new γ- and δ-phases

Cited by 165 publications

References 18 publications

Intramolecularly Coordinated Telluroxane Clusters and Polymers

Intramolecularly Coordinated Telluroxane Clusters and Polymers

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

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

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Dynamics and structure of TeO 2 polymorphs: model treatment of paratellurite and tellurite; Raman scattering evidence for new γ- and δ-phases

Cited by 165 publications

References 18 publications

Intramolecularly Coordinated Telluroxane Clusters and Polymers

Intramolecularly Coordinated Telluroxane Clusters and Polymers

Luminescence in Rare Earth Ion‐Doped Oxide Compounds

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

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