Nitridation of glasses in the system R{sub 2}O-MO-P{sub 2}O{sub 5}

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Materials Research Bulletin

DOI:https://doi.org/10.1016/0025-5408(95)00152-2· OSTI ID:203565

Pascual, L; Duran, A ^[1]

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1. CSIC, Arganda del Rey (Spain). Instituto de Ceramica y Vidrio

Nitrided glasses with the composition 25R{sub 2}O.20MO.55P{sub 2}O{sub 5} (R = Li, Na, K, M = Ba, Pb) were prepared by treatment in an anhydrous ammonia atmosphere between 650 and 800 C for periods of 3 to 40 h. The nitrogen content of the glasses increases linearly with the treatment temperature; as a function of time, the N{sub 2} content tends toward an upper limit, which depends on the temperature. The nitrogen introduction into these glasses causes an increase in the transformation and softening temperatures, microhardness and toughness, while the expansion coefficient decreases slightly with the nitrogen content. However, the rise of the hydrolytic resistance of the glasses by near two orders of magnitude is the most important change caused by nitrogen introduction. The structural study by IR spectroscopic and the analysis of the glass weight losses during the thermal treatment reveal that nitrogen replaces the bridging oxygens in the phosphate network.

• OSTI ID: 203565
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 1 Vol. 31; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
AMMONIA
ANNEALING
BARIUM OXIDES
CHEMICAL PREPARATION
FRACTURE PROPERTIES
HYDROLYSIS
INFRARED SPECTRA
LEAD OXIDES
LITHIUM OXIDES
MECHANICAL PROPERTIES
MICROHARDNESS
NITRIDATION
PHOSPHATE GLASS
POTASSIUM OXIDES
SODIUM OXIDES
THERMAL EXPANSION
THERMODYNAMIC PROPERTIES