Formation and properties of nitrogen-rich strontium silicon oxynitride glasses

Compositional effects on the properties of high nitrogen content alkaline-earth silicon oxynitride glasses, AE=Mg, Ca, Sr, Ba

“…Videau et al 22 found that Mg and Ca oxynitride glasses, with the same amounts of N, have similar T g values, albeit slightly higher in the case of Mg, whereas the corresponding Ba glasses have lower T g values. However, contrary results were obtained by Drew et al, 23 14,[26][27][28][29] has enabled the preparation of oxynitride glasses with significantly higher concentrations of nitrogen, as well as modifier additives. In this synthesis route, the modifier is introduced as a metal or metal hydride, which reacts with nitrogen gas at relatively low temperatures and forms reactive nitrides with no surface oxide layer.…”

“…24,[27][28][29]32 We hold it likely that, during the synthesis, part of the initial Si 3 N 4 and SiO 2 is reduced at an early stage to form silicides with the modifier element. At the high synthesis temperatures used, the silicides are molten, which accounts for their spherical particle shape.…”

Viscosity of high-nitrogen content Ca–Si–O–N glasses

“…However, an alternative synthesis method developed by us has enabled the preparation of oxynitride glasses with significantly higher concentrations of nitrogen, as well as modifier additives, in various systems. [8][9][10][11] In the synthesis route, the modifier is introduced as a metal or metal hydride, which reacts with nitrogen gas at relatively low temperatures and forms reactive nitrides with no surface oxide layer. Theses glasses retain high amounts of the electropositive elements and nitrogen and exhibit very high values of glass transition temperatures, microhardness, elastic moduli and refractive index.…”

“…doi:10.1016/j.jeurceramsoc.2010.07.039 Table 1 Physical properties of the glasses -Vickers hardness (Hv) values were measured with a 500 g load 11 ; Young's and shear elastic moduli, E and G, were measured by means of ultrasonic echography 15 cerning synthesis and additional characterisations are given in Refs. 9,10 The amorphous nature of the glasses was verified by Xray powder diffraction, using a Guinier-Hägg camera and Cu K␣ 1 radiation. Cation concentrations were determined by energy dispersive X-ray point analysis and anion contents determined by combustion analysis (LECO equipment).…”

Equation of state for Eu-doped SrSi2O2N2

“…In this system, nine quaternary materials differing by composition or structure have already been synthesized (see Table I 23 ), and Sr-Si-O-N glass. 24 Moreover, a barium-doped (Sr,Ba) 3 Si 6 O 12 N 2 25 has been reported. Interestingly, when doped, the luminescence observed for these oxonitridosilicates covers a broad spectral range: red, yellow, a) Electronic mail: paszk@ifpan.edu.pl green, blue, and UV, depending on the chemical composition and crystal structure, conversion from UV to visible light has been also reported (for details, see Table I).…”