Network structure of tellurite phosphate glasses: Optical absorption and infrared spectra

Abdel-Kader, A.; El‐Mallawany, R.; Elkholy, M. M.

doi:10.1063/1.354064

Cited by 59 publications

(14 citation statements)

References 19 publications

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“…1, we will use the ASF method; thus, in order to obtain the optical band gap, first we introduce the ASF method, starting with Tauc's equation at the high optical absorption region [40][41][42] as: (1) where E gap , B, hω are the optical gap, a constant and incident photon energy, respectively; α(ω) is the absorption coefficient defined by the Beer-Lambert's law as: α(ω) = (2.303/ d)A, where d and A are the film thickness and film absorbance, correspondingly. For more precise determination of α, it is necessary to perform corrections to the absorption due to reflection; also, n is the index which can have different values 1/2, 3/2, 2, 3 for direct allowed, direct forbidden, indirect allowed and indirect forbidden optical transitions, respectively.…”

Section: Optical Band Gap Determinationmentioning

confidence: 99%

“…The usual method of the band gap evaluation, up on Tauc model, is based on measurement of the optical absorption coefficient; this method have been widely used for different semiconducting glasses. [6,8,16,[38][39][40] In order to determine the Tauc gap, it is mandatory to measure the absorption coefficient (α) as a function of the incident photon energy which is carried out by measuring the film absorbance, the reflectance and the film thickness. [41,42] In the present work we use the absorption spectrum fitting procedure (ASF) [2,43] to obtain the band gap avoiding the film thickness measurement which commonly could not be measured precisely.…”

Section: Introductionmentioning

confidence: 99%

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Effect of antimony on the optical and physical properties of Sb-V2O5-TeO2 glasses

Souri

Mohammadi

Zaliani

2014

Electron. Mater. Lett.

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Ternary glass systems of the form xSb-(60-x) V2O5-40TeO2 (Sx glasses) with 0 ≤ x ≤ 15 (in mol. %) have been prepared by using the normal melt quenching technique. The optical absorption spectra of these glasses have been recorded within wavelength range of 190 -1100 nm. The absorption spectrum fitting method was employed to obtain the energy band gap. In this method, only the measurement of absorbance spectrum of the glass is needed. The position of the absorption edge and therefore the optical band gap values were found to be depend on glass composition. Results show that the optical band gap is in the range 1.57 -2.14 eV. For each sample, the width of the band tail was determined. The densities of present glasses were measured and the molar volumes were calculated. Also, some thermal properties such as glass transition temperature (Tg) and crystallization temperature (TCr) were obtained by using differential scanning calorimetry (DSC) technique, and from which the glass thermal stability S and glass forming tendency Kgl were calculated. Results show that these glasses (specially for x ≥ 10 mol. %) have good stability and therefore good resistance against thermal shocks for technological applications in fiber devices. Also, Tg values indicate the rigidity and packing of the samples increase with increasing the Sb concentration as a network modifier.

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Section: Optical Band Gap Determinationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of antimony on the optical and physical properties of Sb-V2O5-TeO2 glasses

Souri

Mohammadi

Zaliani

2014

Electron. Mater. Lett.

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“…Some works have been published on the calorimetric features of tellurium-based glasses and ternary glasses TeO 2 -V 2 O 5 -A m O n (A m O n is an another oxide) [21][22][23][24][25]35]. Mori et al [10] have investigated the electrical properties of TeO 2 -V 2 O 5 samples, but there is no report on their calorimetric and glass transition temperature.…”

Section: Introductionmentioning

confidence: 99%

The study of glass transition temperature in Sb–V2O5–TeO2 glasses at different heating rates

Souri

2015

Indian J Phys

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The glass transition of xSb-(60 -x)V 2 O 5 -40TeO 2 glasses with 0 \ x \15 (in mol%) at different heating rates (u = 3-12 K/min) has been studied using differential scanning calorimetry. The glass transition temperature (T g ) and crystallization temperature (T cr ) of these glasses have been determined. The effects of the heating rate and the Sb content on T g have been discussed. It has been observed that the transition region shifts to higher temperatures when the measuring time is reduced. The compositional dependence of T g has been determined and so an empirical equation has been deduced relating the glass transition temperature with the Sb concentration. Also, the value of glass-forming tendency has been studied for the present glasses.

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“…The XRD patterns of the present glasses showed no sharp peaks which confirmed amorphous property. The density of the present glass decreased from 2.71 to 2.47 g/cm 3 and molar volume increased from 58.055 to 63.24 cm 3 due to the increase of TiO 2 from 5 to 12.5 mole % as in Table 1. Figure 1 shows UV-Vis spectra for glassy system (95-x)TeO 2 -5Nb 2 O 5 -xTiO 2 , x= 5.0, 7.5, 10.0, 12.5 mol %.…”

Section: Resultsmentioning

confidence: 95%

“…Physical and structural investigations of tellurite glasses have been studied with different transition metal oxides TMO and rare earth oxides REO compositions [1][2][3][4][5][6][7][8][9][10]. Recently, self-cleanliness of co-doped lithium niobate tellurite glass and UV converted white light-emitting diodes (W-LEDs) have been reported [1,4].…”

Section: Introductionmentioning

confidence: 99%

Optical and Thermal Properties of Some Tellurite Glasses

El‐Mallawany¹

2017

AJOP

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Abstract:Tellurite glasses in the form (95-X) TEO 2 -5NB 2 O 5 -XTIO 2 , X= 5.0, 7.5, 10.0 and 12.5 mol % have been successfully prepared by the melt quenching technique. Density ρ and molar volume V have been measured. UV-Visible absorption spectra for the presented ternary tellurite glass systems have been measured in the wavelength range 200-850 nm. The optical band gap, E g , and refractive index, n, of the presented glass systems have been calculated by using the derivation absorption spectrum fitting (DASF) and absorption spectrum fitting (ASF) methods. Also, Urbach's energy, ∆E for tellurite glass systems was obtained using the absorption spectrum fitting (ASF) method. Comparison between both methods has been presented. Differential thermal analysis (DTA) for the prepared glasses with systematic heating rate 10°C/min has been carried out. The glass transition temperature, T g , onset crystallization temperature, T c , melting temperature, T m , glass stability range, S, and glass factor, K g , of the present glasses have been measured. The average cross-link density, ¯n c , number of bonds per unit volume, n b , and average stretching force constant, F¯, have been calculated.

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Network structure of tellurite phosphate glasses: Optical absorption and infrared spectra

Cited by 59 publications

References 19 publications

Effect of antimony on the optical and physical properties of Sb-V2O5-TeO2 glasses

Effect of antimony on the optical and physical properties of Sb-V2O5-TeO2 glasses

The study of glass transition temperature in Sb–V2O5–TeO2 glasses at different heating rates

Optical and Thermal Properties of Some Tellurite Glasses

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