Elastic moduli of some rare-earth doped tellurite glasses

Abstract

Samarium oxide (Sm₂O₃) and ytterbium oxide (Yb₂O₃) doped tungsten-tellurite glasses (TWSm), (TWYb) in the forms of 80 (TeO₂) - (20-x) (WO₃) - x (Sm₂O₃) and 80 (TeO₂) - (20-x) (WO₃) - x (Yb₂O₃) with x = 0, 1.0, 2.0, 3.0, 4.0 and 5.0 mol% were prepared by the melt-quenching technique. The XRD analysis for the two prepared glass systems verified the samplesâ amorphous nature. The glass density ( Ï ) was measured by the Archimedes method. Both ( Ï ) and the molar volume (V_M) of the two prepared systems showed an increase with increasing the concentrations of dopants  Sm³⁺ and Yb³⁺. Longitudinal V_L and shear V_S wave velocities were measured at  5 MHz frequency using the pulse-echo technique. Longitudinal (L), shear (G), bulk (K), and Youngâs moduli ( E ) have been founded. Moreover, Poissonâs  (Ï), Debye temperature (θ_D), softening temperature (T_S), micro-hardness (H) have been founded for every glass sample.   Elastic moduli showed an increase with increasing dopants concentration of (Sm₂O₃) or  (Yb₂O₃). 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.