Elastic moduli of some rare-earth doped tellurite glasses
محورهای موضوعی : Journal of Theoretical and Applied Physics
Raouf El-Mallawany
1
(Physics Department, Faculty of Science, Menoufia University, Menoufia, Egypt.)
Samir A. Yousef
2
(Physics Department, Faculty of Science, Menoufia University, Menoufia, Egypt.)
Abdelhamid El-Shaer
3
(Physics Department, Faculty of Science, Kafreelshikh University, Kafreelshikh, Egypt.)
Hanan A. Elabd
4
(Physics Department, Faculty of Science, Menoufia University, Menoufia, Egypt.)
کلید واژه: Glasses, tellurite, Rare earth, Elastic Moduli,
چکیده مقاله :
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 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 Sm3+ and Yb3+. Longitudinal VL and shear VS wave velocities were measured at 5 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 (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.
