Abstract
Niobium phosphate glasses were produced by microwave heating mixtures of Nb2O5, (NH4)2HPO4, KOH, PbO, and BaCO3. Not all tried compositions were melted during the microwave irradiation. Absorption of microwaves was checked for individual compounds to determine the best chemical form to be used. The presence of KOH is indispensable in the mixture to allow microwave coupling. Glasses were also prepared by melting the same mixtures in an electric furnace. Glasses produced by microwave heating shows concentration of Al lower than the ones for glasses melted in electrical furnaces because only the precursors are directly heated by the microwave energy, reducing the diffusion of elements from the crucible to the liquid. Glasses with dissolution rates in aqueous solution at 90°C of 8.6 × 10−10 g· cm−2 · min−1were produced. The chemical durability of glasses increases as a function of the amount of PbO. The amount of water molecules, OH− radicals, and CO2 bonded to the glass structure decreases as the amount of Nb2O5 increases.
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J. O. Pacheco-Sotelo, E. GutiÉrres-Ocampo, J. S. Benitez-Read, J. Martinez-Valencia and R. Lopez-Callejas. Glass Technology 41(2) (2000) 59.
E. T. Thostenson and T.-W. Chou, Composites Part A 30 (1999) 1055.
B. Swain, Adv. Mater. Proc.—Metal Prog. (9) (1988) 76.
W. H. Sutton, Ceram. Bull. 68(2) (1989) 376.
J. Wilson and S. M. Kunz, J. Amer. Ceram. Soc. 71(1) (1988) C-40.
J. D. Katz and R. D. Blake, Ceram. Bull. 70(8) (1991) 1304.
F. Y. C. Boey and W. L. Lee, J. Mater. Sci. Lett. 9 (1990) 1172.
R. D. Blake and T. T. Meek, ibid. 5 (1986) 1097.
Y. Fang, D. K. Agrawal, D. M. Roy and R. Roy J. Mater. Res. 9(1) (1994) 180.
H. E. Kim, H. D. Kimrey and D. J. Kim, J. Mater. Sci. Lett. 10 (1991) 742.
K. E. Haque, Int. J. Miner Process. 57 (1999) 1.
R. H. G. A. Kiminami, M. R. Morelli, D. C. Folz and D. E. Clark, Amer. Ceram. Soc. Bull. 79(3) (2000) 63.
D. Michael and P. Mingos, Adv. Mater. 5(11) (1993) 857.
M. P. Knox and G. J. Copley, Glass Technology, 38(3) (1997) 91.
R. K. Brow, L. Kovacic and R. E. Loehman, Ceram. Trans. 70 (1996) 177.
T. L. White, W. D. Bostick, C. T. Lson and C. R. Schaich, “Workshop on Vitrification of Low Level Waste: the Process and Potencial” (San Antonio, TX, USA, 5–6 Nov. 1995).
D. E. Day, Z. Wu, C. S. Ray and P. Hrma, J. Non-Cryst. Solids 241 (1998) 1.
W. S. Key and J. C. Miller, ORNL Ver. 27(3) (1994) 4.
B. C. Sales and L. A. Boatner J. Amer. Ceram. Soc. 70(9) (1987).
A. R. Von Hippel, “Dielectric Materials and Applications” (Chapman & Hall, Ltd., 1954) p. 301.
C. Dayanand, G. Bhikshamaiah, V. Jayatyagaraju, M. Salagram and A. S. R. Krishna Murthy, J. Mater. Sci. 31 (1996) 1945.
W. M. Pontuschka, J. G. Dos Santos, L. S. Kanashiro, N. O. Dantas and M. Sen, Ciencia e Engenharia, ano 4 20 (1995) 49.
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Ghussn, L., Martinelli, J.R. A novel method to produce niobium phosphate glasses by microwave heating. Journal of Materials Science 39, 1371–1376 (2004). https://doi.org/10.1023/B:JMSC.0000013899.75724.e1
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DOI: https://doi.org/10.1023/B:JMSC.0000013899.75724.e1