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Lookup NU author(s): Emeritus Professor Derek Thompson
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Iw is a phase which appears close to the glass-forming region of the Y-Si-Al-O-N system, but very little information is available concerning its composition, thermal stability, crystal structure and mechanical properties. The aim of the study was to synthesise and characterise Iw in pure form. Samples with the general composition YxSi3Al2O3 N with x= 3.45, 3.90 and 4.33 and a nitrogen content of 10 e/o were prepared by melting Y2O3 - SiO2 - Al2O3 - Si3N4 powdermixtures at 1700°C. Heat-treatments were performed on quenched samples or directly on the melted glass by rapid cooling to the predetermined dwell temperature. X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) studies show that Iw is very difficult to synthesise in pure form. Its domain of composition and the temperature range for nucleation and growth overlaps with those of N-apatite and B-phase, both of which show preferential growth. ©2000 Trans Tech Publications,.
Author(s): Parmentier J, Thompson DP
Publication type: Article
Publication status: Published
Journal: Materials Science Forum
Year: 2000
Volume: 325-326
Pages: 271-276
Print publication date: 01/01/2000
ISSN (print): 02555476
ISSN (electronic):
