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Glass forming regio...
Glass forming region in Ca-Si-O-N system using CaH2 as Ca source
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- Esmaeilzadeh, Saeid (författare)
- Stockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi
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- Grins, J. (författare)
- Stockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi
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- Sharafat, Ali (författare)
- Stockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi
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(creator_code:org_t)
- Elsevier BV, 2008
- 2008
- Engelska.
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Ingår i: Journal of the European Ceramic Society. - : Elsevier BV. - 0955-2219 .- 1873-619X. ; 28:14, s. 2659-2664
- Relaterad länk:
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https://urn.kb.se/re...
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visa fler...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The present work explores the glass-forming region in the Ca–Si–O–N system, particularly in the N-rich part of the system. Bulk oxynitride glasses in the Ca–Si–O–N system were prepared by melting mixtures of CaH2, SiO2 and Si3N4 powders in a nitrogen atmosphere at 1500–1650 °C. The glasses were characterized by X-ray powder diffraction, differential thermal analysis, scanning electron microscopy and transmission electron microscopy. Glass compositions were calculated from analyses obtained by energy dispersive X-ray (EDX) spectroscopy and combustion analysis, for cation and anion compositions, respectively. The glasses were found to be X-ray amorphous and gray to black in color. The glasses retain up to 58 e/o of nitrogen and 42 e/o of calcium. The glass formation depends on reaction kinetics and the precursor used. A strong exothermic reaction is observed at 850–1000 °C, leading to formation of amorphous and crystalline oxynitride phases that melt at high temperatures upon further heating. Glass transition temperatures (Tg) were observed to vary between 798 °C and 1050 °C, and crystallization occurs typically 130 °C above the glass transition temperature. The glass densities vary between 2.79 g/cm3 and 3.25 g/cm3.
Nyckelord
- Oxynitride glass
- Glass-forming region
- Calcium content
- Nitrogen content
- Ca–Si–O–N
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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