Glasses and glass ceramics in the Li-Si-Al-O-N system were prepared using a natural mineral resource, and the microstructures and mechanical and thermal properties examined. The dominant phases that formed in the Li oxynitride glass ceramics were beta-quartz(ss) and beta-spodumene(ss), and these were believed to develop with equiaxed and acicular grain morphologies respectively. Silicon oxynitride Si2N2O and X-phase Si3Al6O12N2 formed as minor phases. Nanoindentation was used to assess the hardness and elastic moduli of the Li-Si-Al-O-N materials and both parameters were observed to increase with increasing nitrogen content. Thermal expansion measurements revealed that the low expansion characteristics of mineral derived beta-quartz(ss) and beta-spodumene(ss) were generally retained when nitrogen was introduced into the Li2O-Al2O3-SiO2 system. (C) 1997 The Institute of Materials.
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Saveetha Engn Coll, Dept Phys, Chennai 602105, Tamil Nadu, IndiaBhabha Atom Res Ctr, Radiochem Div, Mumbai 400085, Maharashtra, India
Vinothkumar, P.
Sathyamoorthy, K.
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Saveetha Engn Coll, Dept Phys, Chennai 602105, Tamil Nadu, India
Univ Madras, Presidency Coll, Dept Phys, Chennai 600005, Tamil Nadu, IndiaBhabha Atom Res Ctr, Radiochem Div, Mumbai 400085, Maharashtra, India
Sathyamoorthy, K.
Murugasen, Priya
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Saveetha Engn Coll, Dept Phys, Chennai 602105, Tamil Nadu, IndiaBhabha Atom Res Ctr, Radiochem Div, Mumbai 400085, Maharashtra, India