The transparency of oxynitride glasses

Korgul, P.; Thompson, D. P.

doi:10.1007/bf00357831

Cited by 23 publications

(21 citation statements)

References 12 publications

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“…Replacement of 10 eq.% Ca by Y also resulted in amorphous specimens. Nitrogen‐free specimens were colorless, whereas nitrogen‐containing glasses were black or dark gray color as previously reported for oxynitride glasses, and this can be explained by the presence of both FeSi 2 and a smaller number of Si particles . These precipitates also contain other metals such as chromium or nickel.…”

Section: Resultssupporting

confidence: 76%

Properties ofCa–(Y)–Si–Al–O–N–FGlasses: Independent and Additive Effects of Fluorine and Nitrogen

et al. 2013

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Thirty glasses of composition (in equivalent percent) Ca 20-x Y x Si 50 Al 30 O 100-y-z N y F z , with x = 0, 10; y = 0, 10, 20 and z= 0, 1, 3, 5, 7 were prepared by melting and casting. All glasses were X-ray amorphous. Glass molar volumes decreased with nitrogen substitution for oxygen for all fluorine contents and, correspondingly, glass fractional compactness increased. Fluorine substitution of oxygen had virtually no effect on molar volume or fractional glass compactness for the three nitrogen contents tested. Young's modulus and microhardness were virtually unaffected by fluorine substitution for oxygen while nitrogen substitution for oxygen caused increases in these two properties. Glass transition temperature and dilatometric softening point values all decreased with increasing fluorine substitution levels, whilst increasing nitrogen substitution caused values for these thermal properties to increase. Correspondingly, the thermal expansion coefficient increased with fluorine and decreased with nitrogen substitution levels. Using property value differences between glasses containing fluorine and the corresponding glass containing 0 eq. % F enabled 24 data points to be used to determine the effect of fluorine on T g,dil and T DS . The trends were linear with a gradient for both properties of the order of -22ºC·(eq. % F) -1 . For the nitrogen effect, 20 data points were analysed for trend effects. As expected from earlier work, all trends had good linearity. Gradients were for T g,dil and T DS +2.5ºC·(eq. % N) -1 , which are fairly similar to previous results in oxynitride systems. All of the data collected and its analysis clearly shows that the substitution effects of fluorine for oxygen and nitrogen for oxygen are independent and additive with the fluorine substitution. The property trends of the glasses are discussed in terms of their implications for glass structure.

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Section: Resultssupporting

confidence: 76%

Properties ofCa–(Y)–Si–Al–O–N–FGlasses: Independent and Additive Effects of Fluorine and Nitrogen

et al. 2013

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“…The preparation of oxynitride glasses as such is relatively simple, while it is in comparison much more difficult to obtain them free of impurities and transparent [35]. We find that optically clear and bubble free high nitrogen content Ca-Si-O-N glasses can, for certain compositions, be obtained by using starting materials of high purity and slow cooling rates.…”

Section: Discussionmentioning

confidence: 94%

Hardness and refractive index of Ca–Si–O–N glasses

Ali

Grîns

Esmaeilzadeh

2009

Journal of Non-Crystalline Solids

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“…Most of the glasses were gray or black in color, which is due to the presence of FeSi 2 particles precipitated from the glasses 25 . The very highest modifier content compositions (48–49 eq% Ca) were yellow.…”

Section: Resultsmentioning

confidence: 99%

“…Most of the glasses were gray or black in color, which is due to the presence of FeSi 2 particles precipitated from the glasses. 25 The very highest modifier content compositions (48-49 eq% Ca) were yellow. This effect was found previously in calcium aluminosilicate glasses 26 and is due to an increase in absorption in the visible region, which decreases gradually as wavelength increases.…”

Section: (1) Glass Formation In the Ca-si-al-o-n-f Systemmentioning

confidence: 95%

Novel Glass Formation in the Ca–Si–Al–O–N–F System

Hanifi

Pomeroy

Hampshire

2010

Journal of the American Ceramic Society

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Ca–Si–Al–O–N–F glass formation regions have been mapped on 6Ca2+–3Si4+–4Al3+ ternary diagrams at fixed O:N:F of 79:20:1 and 75:20:5 (in eq%). For both fluorine contents, glass formation regions extend toward more Ca‐rich compositions at 1650°C compared with the Ca–Si–Al–O–N system at 1700°C. Ca–Si–Al–O–N–F melting temperatures are 150°–800°C lower than equivalent Ca–Si–Al–O compositions due to fluorine incorporation into the melt. Si‐rich compositions, with both 1 and 5 eq% F, form porous glasses due to loss of SiF4. Reaction mechanisms were studied by firing two compositions (0 or 5 eq% F) with identical cation ratios in the range of 900°–1650°C at 100°C intervals and following phase development using X‐ray diffraction. For Ca–Si–Al–O–N compositions, initial liquid formation occurs at >1200°C with complete dissolution of Si3N4 at 1300°C. For Ca–Si–Al–O–N–F compositions, reactions occur at lower temperatures with Si3N4 dissolution at 1200°C. At 20 eq% N, glasses with maximum fluorine content of ∼7 eq% were obtained. At 5 eq% F, the solubility limit for N is ∼25 eq%. At 1 eq% F, the maximum nitrogen content can be substantially increased to 40 eq% N. Incorporation of both nitrogen and fluorine in Ca–Si–Al–O glasses extends glass formation regions through combinations of lower melting temperatures (fluorine) and higher viscosities (nitrogen).

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The transparency of oxynitride glasses

Cited by 23 publications

References 12 publications

Properties ofCa–(Y)–Si–Al–O–N–FGlasses: Independent and Additive Effects of Fluorine and Nitrogen

Properties ofCa–(Y)–Si–Al–O–N–FGlasses: Independent and Additive Effects of Fluorine and Nitrogen

Hardness and refractive index of Ca–Si–O–N glasses

Novel Glass Formation in the Ca–Si–Al–O–N–F System

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