Effective Parameters in Synthesis and Properties of Monolithic Oxynitride Glasses Prepared by Sol-gel Method

Document Type : Original Articles

Authors

• sara ahmadi ¹
• Bijhan Eftekhariyekta ¹
• Hossein Sarpoolaky ¹
• Alireza Aghaei ²

¹ Iran University of Science and Technology, Tehran, Iran

² Material &Energy Research Center, Tehran, Iran

10.22067/ma.v28i1.34441

Abstract

The monolithic oxynitride glasses in SiO2-Al2O3-B2O3 system were synthesized using sol-gel method. The porous, dried gels were heated in flowing ammonia for different times and varying temperatures. The nitrogen content of the oxynitride glasses was determined using an oxygen-nitrogen analyzer. The chemical bonding state and properties of glasses were investigated by means of Fourier transform infrared spectroscopy, dilatometry, and Vickers hardness methods. The crystallization behavior of glasses was studied with X-ray diffraction. Spectroscopic evidence indicated that nitrogen was chemically dissolved in the glass network. The results showed that the chemical composition of the glass has an effect on the nitridation processes. The nitrogen content of the glasses was increased to 3.8% wt. by increasing the soaking time of nitridation from 2 to 15h. The dilatometric softening point temperature of the glasses was increased approximately 25°C, the micro-hardness value reached 10.89 GPa and thermal expansion coefficient was decreased from 3.88×10-6 to 3.39×10-6 after the nitridation process at optimal composition. The X-ray diffraction pattern of the glasses confirmed that nitrogen does not enter the crystalline phase.

Keywords

• Sol-gel
• Ammonia Atmosphere
• Nitridation of Gel
• Oxynitride Glass

---

References

1. Becher P.F., Hampshire S., Pomeroy M.J., Hoffman M., Lance M., “An over view of the structure and properties of silicon based oxynitride glasses”, International Journal of glass science, Vol. 2, No. 1, pp. 63-83, (2011).

2. Hampshire S., “Oxynitride glasses, their properties and crystallization”, Journal of Non-Crystalline Solids, Vol. 316, pp. 64-73, (2003).

3. Pomeroy M.J., Hampshire S., “SiAlON glasses: Effects of nitrogen on structure and properties”, Journal of the Ceramic Society of Japan, Vol. 116, No. 6, pp. 755-761, (2008).

4. Sakka S., “Structure, properties and application of oxynitride glasses” Journal of Non-Crystalline Solids, Vol. 181, pp. 215-224, (1995).

5. Hampshire S., “Oxynitride glasses”, Journal of the European Ceramic Society, Vol. 28, pp. 1475-1483, (2008).

6. Lofaj F., Satet R., Hoffman M.J., Lopez A., “Thermal expansion and glass transition temperature of the rare earth doped oxynitride glasses”, Journal of European Ceramic Society, Vol. 24, pp. 3377-3385, (2004).

7. Sherafat A., Grins J., Esmaeilzadeh S., “Properties of high nitrogen content mixed alkali earth oxynitride glasses”, Journal of Non-Crystalline Solids, Vol. 355, pp. 1259-1263, (2209)

8. Graaf D., Hintzen H.T., Hampshire S., With G., “Long wavelength Eu2+ emission in Eu-doped Y–Si–Al–O–N glasses”, Journal of the European Ceramic Society, Vol. 23, pp. 1093-1097, (2003).

9. Graaf D., Hintzen H.T., With G., “The influence of the composition on the luminescence of Ce(III)–Ln–Si–Al–O–N glasses (Ln=Sc, Y, La, Gd)”, Journal of Luminescence, Vol. 104, pp. 131-136, (2003).

10. Brinker C.J., Haaland D.M., “Oxynitride glass formation from gel”, Journal of American Ceramic Society, Vol. 66, No.11, pp. 758-764, (1983).

11. Brinker C.J., “formation of oxynitride glasses by ammonolysis of gels”, Journal of American Ceramic Society, C-4, (1982).

12. James P.F., “High performance glasses”, Chapman and Hall, pp.21-62, (1991).

13. Sekine M., Katayama S., “Preparation of silicon oxynitride glass fibers by ammonolysis of silica gels”, Journal of Non-Crystalline Solids, Vol.134, pp. 199-207, (1991).

14. Szaniawska K., Gładkowski M., Wicikowski L., Murawski L., “Nitridation of SiO2–B2O3 aerogels”, Journal of Non-Crystalline Solids, Vol. 354, pp. 4481–4483, (2008).

15. Szaniawska K., Murawski Z., Pastuszak R., Walewski M., Fantozzi G., “Nitridation and densification of SiO2 aerogels”, Journal of Non-Crystalline Solids, Vol. 286, pp. 58-63, (2001).

16. Bachar A., Mercier C., Tricoteaux A., Leriche A., Follet C., Saadi M., Hampshire S., “Effects of addition of nitrogen on bioglass properties and structure”, Journal of Non-Crystalline Solids, Vol. 358, pp. 693–701, (2012).