Structure of zinc and niobium tellurite glasses by neutron and x-ray diffraction

Hoppe, Uwe; Yousef, El Sayed; Rüssel, Christian; Neuefeind, J.; Hannon, Alex C.

doi:10.1088/0953-8984/16/9/013

Cited by 70 publications

(54 citation statements)

References 43 publications

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“…If ZnO as a second oxide is added to TeO 2 networks formed from the corner-connected TeO 4 units, the modification process start with rupture of Te-O-Te bridges and change of the two participating TeO 4 to TeO 3 units, each of latter having two NBOs. Among the samples studied by Hoppe et al [11] , only that with 22 mol% ZnO shows this behavior. Further increasing the modifier content stabilizes TeO 4 units with non-bridging oxygen (NBO).…”

Section: Resultsmentioning

confidence: 80%

“…Consequently, the NBO bonds have higher polarizability and cation refractions. An addition in either electron density or polarizability of the ions will cause an increase in the refractive index (n) of materials [11] . If ZnO as a second oxide is added to TeO 2 networks formed from the corner-connected TeO 4 units, the modification process start with rupture of Te-O-Te bridges and change of the two participating TeO 4 to TeO 3 units, each of latter having two NBOs.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Optical Properties of ZnO-TeO2 Glass System

Sidek¹,

Rosmawati²,

Talib³

et al. 2009

American J. of Applied Sciences

158

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Problem statement: Systematic series of ZnO-TeO 2 glasses with mole fraction of 0.10-0.40 ZnO content with an interval of 0.05 were studied to obtain their physical and optical properties. Approach: All the glass samples were synthesized by rapid melting quenching method under controlled conditions, while their refractive indices (n) were measured by the EL X-02C high precision ellipsometer. The room temperature absorption of all glass samples were determined using Camspec M350 double beam UV-visible spectrophotometer. The infrared (IR) spectra of each glass samples were recorded with Thermo Nicolet Fourier Transform-Infrared (FT-IR) spectrophotometer. Their physical properties were measured and the amorphous nature was confirmed by the x-ray diffraction technique. Results: The increase of refractive index of the TeO 2 -ZnO glasses with the addition of ZnO was best explained in terms of either electron density or polarizability of the ions. The absorption edge shift to higher energy (shorter wavelength) with increasing ZnO content was observed in this glass. The optical band gap (E opt ) of zinc tellurite glass decreases with increasing of ZnO content probably due to the increment of Non-Bridging Oxygen (NBO) ion contents which eventually shifted the band edge to lower energies. Conclusion/Recommendation: The physical and optical properties of zinc tellurite glasses were found generally affected by the changes in the glass composition. FTIR spectra of zinc tellurite glass revealed broad, weak and strong absorption bands in the investigated range of wave numbers from 4000-400 cm −1 which associated with their corresponding bond modes of vibration and the glass structure. The addition of ZnO into TeO 2 glass network shifted the major band from 626 cm −1 (for pure TeO 2 glass) to the band at around 669 cm −1 .

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Synthesis and Optical Properties of ZnO-TeO2 Glass System

Sidek¹,

Rosmawati²,

Talib³

et al. 2009

American J. of Applied Sciences

158

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“…A decrease in longitudinal and shear velocities is observed as evident. Figure 3 shows the variation of elastic moduli of silver borotellurite with Ag2O content and Table 1 [15]. Addition of Ag 2 O causes discontinuity of glass structure and hence, a decrease in rigidity and velocity.…”

Section: Resultsmentioning

confidence: 99%

Elastic properties of TeO2–B2O3–Ag2O glasses

Halimah

Daud

Sidek

2010

Ionics

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A series of glasses [(TeO 2 ) x (B 2 O 3 ) 1−x ] 1−y [Ag 2 O] y with x=70 and y=10, 15, 20, 25 and 30 mol% were synthesised by rapid quenching. Longitudinal and shear ultrasonic velocity were measured at room temperature and at 5 MHz frequency. Elastic properties, Poisson's ratio, microhardness, softening temperature and Debye temperature have been calculated from the measured density and ultrasonic velocity at room temperature. The experimental results indicate that the elastic constants depend upon the composition of the glasses and the role of the Ag 2 O inside the glass network is discussed. Estimated parameters based on Makishima-Mackenzie theory and bond compression model were calculated in order to analyse the experimental elastic moduli. Comparison between the experimental elastic moduli data obtained in the study and the calculated theoretically by the mentioned above models has been discussed.

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“…The reduced structure factors, i(Q) (Q = 4 sin Â/ ; = 1.542 Å), the radial distribution functions (RDF) were calculated using the corrected intensity with the procedures described in Refs. [23][24][25][26][27].…”

Section: Glass Characterizationmentioning

confidence: 99%