Tellurite And Fluorotellurite Glasses For Active And Passive

3. Glass batching and melting; MDO 80
(NH4)2ZnF4 (NH4)ZnF3 + NH3↑ + HF↑ 400°C (3.9)
(NH4)ZnF3 ZnF2 + NH3↑ + HF↑ 400°C (3.10)
Fig. (3.5) summarises the stages of this drying and decomposition:
Zn(OH)2
or
Zn(OH)F
+ (NH4)HF2
at 70°C
Fig. (3.5): Proposed drying and decomposition reactions of ‘wet’ ZnF2.
3.5. References
(NH4)2ZnF4
at 400°C
(NH4)ZnF3
at 400°C
[1] M. Cable, The calculation of glass and batch compositions, 5th ed. Sheffield:
University of Sheffield, 1996.
[2] J. E. Huheey, Inorganic chemistry: principles of structure and reactivity, S.I.
Units ed. London: Harper & Row, 1975.
[3] K. J. Ewing, J. S. Sanghera, R. E. Miklos, M. G. Sachon, L. Peitersen, P. Hart,
and I. Aggarwal, "Reaction of Zirconium Fluoride Monohydrate and
Ammonium Bifluoride - Its Effect on Fluoride Glass Preparation and Quality,"
Journal of the American Ceramic Society, vol. 72, pp. 1441-1443, 1989.
[4] J. S. Sanghera, P. Hart, M. G. Sachon, K. J. Ewing, and I. Aggarwal, "New
Fluorination Reactions of Ammonium Bifluoride," Journal of the American
Ceramic Society, vol. 73, pp. 1339-1346, 1990.
[5] M. Poulain, "Halide Glasses," Journal of Non-Crystalline Solids, vol. 56, pp.
1-14, 1983.
[6] N. Saito, H. Haneda, W. S. Seo, and K. Koumoto, "Selective deposition of
ZnF(OH) on self-assembled monolayers in Zn-NH4F aqueous solutions for
micropatterning of zinc oxide," Langmuir, vol. 17, pp. 1461-1469, 2001.
[7] M. Watanabe and S. Nishimura, "Process for producing fluorides of metals,"
in U.S. Patent 4,741,893. Japan: Solex Research Corporation of Japan, 1988.
ZnF2