Elastic properties of lead-phosphate glasses doped with erbium trioxide

Abstract

The elastic properties of xEr2O3·(50 – x) PbO·50P2O5 (x = 0.1 to 0.5 mol%) glasses are investigated using ultrasonic pulse-echo measurements and their elastic properties are characterized at room temperature. Results from the studies show that both longitudinal and transverse velocities increase with increase of Er2O3 concentration. The elastic constants C11, C12, C44, and Young’s modulus show increasing trend while Bulk modulus and Poisson’s ratio show an increasing trend up to 0.4 mol% and 0.3 mol% of Er2O3, respectively, then there is sudden decreasing trend observed. But in the case of Debye temperatures the reverse trend has been observed. Another notable observation is that the glass with 0.4 mol% and 0.5 mol% of Er2O3 concentration exhibits high velocities and high elastic moduli. This behavior of the elastic properties is related to the change in the structure of glasses as well as the interatomic bonding.PACS No.: 62.20.DC