Ultrasonic attenuation with relaxation at low temperatures of Nd3+ doped phosphate glasses for potential solid-state laser applications

The glass set, with varying compositions of (1-x) (0.659 P2O5, 0.095 ZnO, and 0.244 PbO), was used to investigate longitudinal ultrasonic attenuation at frequencies of 2, 4, 6 and 14 MHz between 120 and 300 K. The glass samples contained different mole percentages of Nd2O3, specifically x = 0.00, 0.0046, 0.0092, 0.0138, and 0.0271. Based on the glass construction and switching frequency in well-defined broad absorption curve reaches its highest points at different temperatures. These peaks shifted to higher temperatures, indicating a relaxing mechanism, as the overall frequency increased. A thermally driven relaxation process led to the development of an approach, that the activation mechanism's average energy was mainly influenced by the mole percent content of Nd2O3. The observed diminish of the acoustical energy of activation worth's, quantifiably expressed in terms of the diminished amount of oxygen atoms moving at a double-well potential, that was determined based on the number of loss centers. Such decrease in average activation energy was correlated with the increase in; Bulk elastic modulus, glass transition temperature, linear expansion coefficient and average bond dissociation energy with Nd2O3.