Nitridation effect on properties of stannous-lead phosphate glasses

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb03110.x· OSTI ID:554012

Yung, H; Shih, P Y ^[1]; Liu, H S; Chin, T S ^[2]

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1. Lienho Coll. of Technology and Commerce, Miao Li (Taiwan, Province of China). Dept. of Ceramic Engineering
2. Tsing Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Materials Science and Engineering

Stannous-lead phosphorus oxynitride (Sn-Pb-P-O-N) glasses were prepared by remelting under an anhydrous ammonia atmosphere. Glasses that contained up to {minus}4.2 wt % (9 at.%) of nitrogen were obtained. The rate of nitrogen dissolution was studied as a function of remelting time (3--66 h) and temperature (400--600 C). The onset nitridation temperature was extrapolated to be 315 C; higher nitridation temperatures accelerated nitrogen dissolution. Nitridation of the stannous-lead oxyphosphate (Sn-Pb-P-O) glasses decreased the dissolution rate in water and the thermal expansion coefficient; however, it increased the dilatometric softening temperature, the glass-transition temperature, the microhardness, and the density. The chemical durability of the nitrided glasses increased more than four orders of magnitude with 3.0 wt% of nitrogen content. An increase in the lead oxide content in the stannous phosphate glasses also improved the chemical durability. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy suggested that nitrogen replaces the terminating hydroxyl ion and the bridging and nonbridging oxygen atoms in the PO{sub 4} tetrahedra to form the functional groups {minus}NH<, {minus}N<, and {minus}N=, which leads to enhanced crosslinking of the glass network. Quantitative results regarding these bondings have been given.

• Sponsoring Organization: National Science Council, Taipei (Taiwan, Province of China)
• OSTI ID: 554012
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMMONIA
BULK DENSITY
CHEMICAL COMPOSITION
GLASS
LEAD PHOSPHATES
MICROHARDNESS
NITRIDATION
PHYSICAL PROPERTIES
SAMPLE PREPARATION
TEMPERATURE RANGE 0400-1000 K
THERMAL EXPANSION
TIN PHOSPHATES
TRANSITION TEMPERATURE