Elastic moduli of some rare-earth doped tellurite glasses

Samarium oxide (Sm۲O۳) and ytterbium oxide (Yb۲O۳) doped tungsten-tellurite glasses (TWSm), (TWYb) in the forms of ۸۰ (TeO۲) - (۲۰-x) (WO۳) - x (Sm۲O۳) and ۸۰ (TeO۲) - (۲۰-x) (WO۳) - x (Yb۲O۳) with x = ۰, ۱.۰, ۲.۰, ۳.۰, ۴.۰ and ۵.۰ mol% were prepared by the melt-quenching technique. The XRD analysis for the two prepared glass systems verified the samples’ amorphous nature. The glass density ( ρ ) was measured by the Archimedes method. Both ( ρ ) and the molar volume (VM) of the two prepared systems showed an increase with increasing the concentrations of dopants  Sm۳+ and Yb۳+. Longitudinal VL and shear VS wave velocities were measured at  ۵ MHz frequency using the pulse-echo technique. Longitudinal (L), shear (G), bulk (K), and Young’s moduli ( E ) have been founded. Moreover, Poisson’s  (σ), Debye temperature (θD), softening temperature (TS), micro-hardness (H) have been founded for every glass sample.   Elastic moduli showed an increase with increasing dopants concentration of (Sm۲O۳) or  (Yb۲O۳). Moreover, the bulk modulus of (TWSm) glasses was higher than (TWYb) glasses. Mechanical properties of  (TWSm) and (TWYb) are crucial parameter in manufacturing optical fibers.

کلیدواژه ها:

Glasses ، tellurite ، Rare earth ، Elastic Moduli