Abstract
Infrared (IR) absorption spectroscopy and ultrasonic pulse-echo techniques are employed for studying optical and mechanical properties of some manganese-phosphate glasses doped with 1 wt% Nd 2 O 3 . IR spectra in the range 4000 to 200 cm -1 were recorded at room temperature and the effect of composition on the observed and assigned absorption bands is investigated. Variations of mid-band positions of those absorption bands with the MnO 2 content showed three composition regions, up to 20, 20-40 and 40-60 mol% MnO 2 . Ultrasonic measurements were carried out at 3 MHz frequency showing that the ultrasonic attenuation and the glass density are sensitive to the glass composition and behave conversely to each other. The results indicate that the longitudinal wave velocity and the longitudinal elastic modulus show the same trend with composition. However, the results of the ultrasonic measurements confirmed the occurrence of an anomalous behavior of the three composition regions observed in the IR investigations.
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