Ultrasonic studies on alkali borate tungstate glasses

Acoustic Investigations on Pure and Rare Earth Ion Doped MgO-ZnO-B2O3 Glasses

“…This is apparently due to the successive decrease in the depolymerisation. This is further confirmed by a slight increase in the microhardness (H) of the MZB: Ln 3+ glasses with increase in the atomic number (Z) of Ln 3+ ions as given in table 2 [4]. The values of Young's modulus (Y) and shear modulus (G), at room temperature for pure MZB glass are found to be 57.24 and 22.86 GPa respectively.…”

“…Increase in the temperature of the measurement causes an enhancement of the depolymerisation of the glass network leading to an increase in the mechanical loss factor; such an increase in the loss factor may be responsible for decrease in these values [4].…”

“…M Rami Reddy et.al [4] . Elastic moduli (E, G), Poisson's ratio (s), microhardness (H) and some thermodynamical parameters such as Debye temperature (θD), diffusion constant (Di), latent heat of melting (Hm) parameters were evaluated and found to increase with increasing atomic number Z of the rare-earth ions and found to decrease with increasing temperature of measurement.…”

“…Elastic moduli (E, G), Poisson's ratio (s), microhardness (H) and some thermodynamical parameters such as Debye temperature (θD), diffusion constant (Di), latent heat of melting (Hm) parameters were evaluated and found to increase with increasing atomic number Z of the rare-earth ions and found to decrease with increasing temperature of measurement. P. Vasantharani et.al [4] studied physical and elastic properties of the ternary glass system of (50-x) Li 2 O-50B 2 O 3 -xNa 2 O (where x =10, 15, 20, 25 and 30 mol%) with different compositions. AN.…”

“…Upon addition of alkali oxides to B 2 O 3 , the covalent network of amorphous boron oxide causes considerable changes, resulting in the creation of anionic sites that accommodate the modifying alkali cations [4]. With the presence of property modifying salts like ZnO with B 2 O 3 glass network could significantly improve different properties like very glass nature, mechanical strength and thermal stability with an extended chemical durability.…”