Abstract
The glass system 40B
2
O
3
–20SiO
2
–9Na
2
O–1Fe
2
O
3
–(30-x)Bi
2
O
3
–xMoO
3
, x = (0, 5, 10, 12.5 and 15 mol%) was prepared and analyzed by using X-ray diffraction, IR spectroscopy, density, differential thermal analysis (DTA), optical properties and mechanical properties. The structural variations due to the increase of the MoO
4
at the expense of the BiO
3
structural unit increase the ultrasonic velocity and the elastic moduli along with a decrease of the density. The increase of the glass transition temperature,
T
g
, according to DTA confirmed this behavior. The values of the optical band gap
E
g
and refractive index have been determined and it was found that these parameters are sensitive to the increase of MoO
3
content.