Elastic Properties of γ-radiated Borate Glasses Using Pulse Echo Technique | ||||
Egyptian Journal of Solids | ||||
Article 6, Volume 24, Issue 2, 2001, Page 181-192 PDF (102.04 K) | ||||
DOI: 10.21608/ejs.2001.151441 | ||||
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Abstract | ||||
Longitudinal and shear ultrasonic velocities were measured in sodium borate glass samples of different compositions before and after irradiation with γ-rays. Measurements were carried out at room temperature and 4 MHz frequency using pulse echo technique. Densities of the glass samples were measured using displacement method while toluene was used as immersion liquid. Elastic constants were calculated as well as Debye temperature, softening temperatures and microhardness for all glass samples. The results showed that, irradiation of sodium borate glass has less noticeable change on ultrasonic velocity than the effect of increasing sodium oxide content. The increase in velocity was attributed to the gradual increase in the rigidity of the glass and, hence, strengthening of the network due to the gradual change of boron atoms from the three-fold to the four-fold coordination of oxygen atoms. | ||||
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