Structural Investigation of Na2O–B2O3–SiO2 Glasses Doped with NdF3

Sodium borosilicate glasses doped with different
content of NdF3 mol % 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 NdF3 modifier content. Results showed that the elastic
moduli, Debye temperature, softening temperature and Poisson's ratio
have very slight change with the change of NdF3 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).

Authors:

• M. S. Gaafar
• S. Y. Marzouk

Keywords:

• Borosilicate glasses
• ultrasonic velocity
• elastic moduli
• FTIR spectroscopy
• bond compression model.

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