Mechanical and structural studies on sodium borosilicate glasses doped with Er₂O₃ using ultrasonic velocity and FTIR spectroscopy

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• 作者：M.S. Gaafar ; S.Y. Marzouk
• 关键词：Borosilicate glasses ; Ultrasonic velocity ; Elastic moduli ; FTIR spectroscopy ; Bond compression model
• 刊名：Physica B
• 出版年：2007
• 出版时间：15 January 2007
• 年：2007
• 卷：388
• 期：1-2
• 页码：294-302
• 全文大小：264 K

文摘

Sodium borosilicate glasses doped with different mol % content of Er₂O₃ have been prepared by rapid-quenching method. Ultrasonic velocities (both longitudinal and shear) measurements have been carried out at room temperature and at ultrasonic frequency of 4 MHz. Elastic moduli, Debye temperature, softening temperature, and Poisson's ratio have been obtained as a function of Er₂O₃ modifier content. Results show that the above-mentioned parameters have very slight change with the change of Er₂O₃ mol % content. Based on FTIR spectroscopy and theoretical (bond compression) model, quantitative analysis has been carried out in order to obtain more information about the structure of these glasses. The study indicated that the structure of these glasses is mainly composed of SiO₄ units with four bridging oxygens (Q₄), and with three bridging and one nonbridging oxygens (Q₃).