Thermal properties of multicomponent tellurite glass

Journal of Materials Science (Impact Factor: 2.31). 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.

1 Bookmark
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A glass containing SeO2, TeO2, MoO3 and La2O3 was obtained at high oxygen pressure (P = 36 MPa) using pure oxides as precursors. The real bulk chemical composition of the glass according to LA-ICP-MS analysis is 17SeO2·50TeO2·32MoO3·1La2O3 (wt.%). The glass was characterized by X-ray diffraction, scanning electron microscopy (SEM), differential thermal analysis (DTA), UV–Vis, XPS, IR and EPR spectroscopy. According to DTA the glass transition temperature (Tg) is below 300 °C. By IR and X-ray photoelectron spectroscopy was determined the main building units (TeO3, TeO4, SeO3, Mo2O8) and the existing of mixed bridging bonds only, which build up the amorphous network. It was established by UV–Vis that the glass is transparent above 490 nm. As a result of a lengthy heat treatment, crystallization took place and crystals rich in SeO2 and TeO2 were found incorporated into the amorphous part containing all components.
    Optical Materials 09/2012; 34(11):1781–1787. · 1.92 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The new semiconducting noncrystalline solid “tellurite glasses” of the form 0.7 TeO <sub>2</sub>–(0.3- x ) V <sub>2</sub> O <sub>5</sub>– xA <sub> n </sub> O <sub> m </sub> have been prepared in bulk form with different compositions where A <sub> n </sub> O <sub> m </sub> is CeO <sub>2</sub> or ZnO and x =0.03,0.05,0.07,0.10 mol   % . Longitudinal ultrasonic attenuation in these glasses has been measured at frequencies of 2, 4, 6, and 8 MHz and in the temperature range of 100–300 K. The results showed the presence of a very well defined peak which shifts to higher temperature with increasing frequency, suggesting a kind of relaxation process. The acoustic activation energy, as well as the relaxation frequency, has been calculated and correlated with the relaxation strength for each composition. Correlations between the present low temperature of ultrasonic attenuation and the previous room temperature elastic moduli have been achieved for both glass series.
    Journal of Applied Physics 04/2010; · 2.21 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    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). · 1.66 Impact Factor


Available from
May 17, 2014