Article

# Thermal properties of multicomponent tellurite glass

(Impact Factor: 2.37). 04/2008; 43(15):5131-5138. DOI: 10.1007/s10853-008-2737-4

ABSTRACT

Quaternary tellurite glass systems of the form 80TeO2–5TiO2–(15−x)WO3−xAnOm where AnOm is Nb2O5, Nd2O3, and Er2O3, x=0.01, 1, 3, and 5mol% for Nb2O5 and x=0.01, 0.1, 1, 3, 5, and 7mol% for Nd2O3 and Er2O3, have been prepared by the melt quenching. Density and molar volumes have been measured and calculated for every glass system.
The thermal behavior of the glass series was studied by using the differential thermal analysis DSC. Glass transition temperature
T
g, crystallization temperature T
c, and the onset of crystallization temperature T

x
were determined. The glass stability against crystallization S (≈100°C) and glass-forming tendency K
g (≈0.3) have been calculated. Specific heat capacity C
p (≥1.4J/g°C) was measured from room temperature and above the T
g for every composition in each glass series. Quantitative analysis of the above thermal properties of these new tellurite
glass with the structure parameters like average cross-link density
$\ifmmode\expandafter\bar\else\expandafter\=\fi{n}_{{\text{c}}}$ \ifmmode\expandafter\bar\else\expandafter\=\fi{n}_{{\text{c}}} (≥2.4), number of bonds per unit volume n
b (≥8×1028cm−3), and the average stretching force constant (F) have been studied for every glass composition.

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• "The properties of the host material are very important to study before being doped with any rare-earth elements. Some of the fundamental aspects of tellurite glasses such as glass structure, physical, thermal, optical and other spectroscopy properties have been extensively studied [3] [4] [5] [6] [7] [8] [9] [10] [11] [12]. "
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ABSTRACT: Ternary lithium boro-tellurite systems in the form 75TeO2−xB2O3-(25−x) Li2O and 80TeO2-xB2O3-(20−x) Li2O where, x= 5, 10 and 15 mol% have been prepared by the melt quenching technique. UV- spectra of the prepared glasses in the range 200-550 nm has been recorded at room temperature. The cut-off wavelength (νc), optical band gap (Eopt) and Urbach energy (∆E) were calculated from optical absorption data. Differential scanning calorimetry (DSC) has been carried out on the prepared glass systems in the temperature range 400-800 K. The glass transition Tg and crystallization Tc temperatures values were measured from DSC thermo-gram. Activation energy for transition Et, activation energy for crystallization Ec and order of crystallization have been calculated for every glass composition.
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• "TeO 2 -based glasses have wide glass forming range and useful properties such as low melting temperature, high dielectric constant, high refractive index, low phonon energy and good transmittance of infrared radiation (0.4–6 μm); therefore, tellurite glasses have attracted significant interest over many years for application in non-linear optical devices , optical fiber amplifiers, lasers, solid state batteries, etc. [1] [2] [3] [4] [5]. "
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• "The propagation of ultrasonic waves in solids provides valuable information about the solid state motion in the material. In recent years, the subject of glasses has rapidly increased because of their various applications in electronics, nuclear and solar energy technologies, and acoustooptic devices [11] [12]. The acoustic wave propagation in bulk glasses has been of considerable interest to understand their mechanical properties. "
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