Thermal properties of multicomponent tellurite glass

Journal of Materials Science (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
g, crystallization temperature T
c, and the onset of crystallization temperature T

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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Available from: R. El-Mallawany, Sep 27, 2015
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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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    ABSTRACT: Borotellurite (xB2O3–(100 − x)TeO2; x = 15, 20, 25, 30 and 35 mol.%) and alumino-borotellurite (yAl2O3–10B2O3–(100 − y)TeO2; y = 5, 10, 20 and 30 mol.%) glasses are prepared and studied by X-ray diffraction, density, differential scanning calorimetry, thermo-gravimetric analysis, UV–visible, infrared and Raman spectroscopy. Borotellurite glasses are hygroscopic and on crushing into powder, they absorb atmospheric water vapors to form crystalline precipitates of TeO2 in an amorphous matrix; the chemical durability of these glasses deteriorates with increasing B2O3 concentration. The refractive index of borotellurite glasses decreases from 2.29 to 2.26 while the glass transition temperature increases from 339 to 366 °C with an increase in B2O3 mol.%. The short-range structure of glasses consists of TeO4, TeO3, BO4 and BO3 structural units. Using the ratio of the areas under TeO4/TeO3 and BO4/BO3 Raman and infrared bands respectively, the Te 2 3 2 3 2 3
    Journal of Non-Crystalline Solids 11/2014; 404:116–123. DOI:10.1016/j.jnoncrysol.2014.08.002 · 1.77 Impact Factor
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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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    ABSTRACT: New ternary zinc oxyfluorotellurite (ZOFT) with the composition (ZnO)𝑥-(AlF3)𝑦-(TeO2)𝑧, where 5 ≤ 𝑥 < 35; 5 ≤ 𝑦 ≤ 25; 60 ≤ 𝑧 ≤ 70, has been successfully prepared by the conventional rapid melt quenching technique. Density, molar volume, and glass transition temperature have been assessed for each ZOFT glass sample. The longitudinal and transverse ultrasonic waves propagated in each glass sample weremeasured using aMBS8020 ultrasonic data acquisition system at 5MHz frequency and room temperature. The longitudinal modulus (𝐿), shear modulus (𝐺), Young’s modulus (𝐸), bulk modulus (𝐾), and Poisson’s ratio (𝜎) are assessed from both velocity data and their respective density. The compositional dependence of the ultrasonic velocities and related parameters are discussed to understand the rigidity and compactness of the glass system studied.
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    • "Among the glasses, tellurite glasses are known to be the important material in the photonics, electronic switching, lasers and optical amplifiers etc. due to its excellent characteristics viz. high refractive index 2.1 , low phonon energy 750 cm , low melting point 1000 C , long transmission window (400–4500 nm), large rare earth solubility, high dielectric constant, large absorption and emission crosssection , high mechanical and chemical stability [22]–[26]. These glasses are also very much resistant material against corrosion even in presence of concentrate nitric acid. "
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    ABSTRACT: The zinc tellurite glasses (TZO) codoped with ${Eu}^{3+}{{–}} {Yb}^{3+}$ ions have been prepared by the conventional melt and quenching technique. The photoluminescence spectra of the glass samples have been measured under 976-nm CW diode laser excitation. Several upconversion emission bands ranging from the blue to near infrared region have been detected in the codoped samples. The sensitized cooperative energy transfer process from the ${Yb}^{3+}$ to ${Eu}^{3+}$ ions and cross-relaxation process has been found to be responsible mechanism for the upconversion emissions in ${Eu}^{3+}$ ions.
    Journal of Display Technology 07/2013; 9(7). DOI:10.1109/JDT.2012.2236820 · 2.24 Impact Factor
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