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

Ali, Sharafat; Jonson, Bo

doi:10.1016/j.jeurceramsoc.2010.11.005

Cited by 42 publications

(27 citation statements)

References 37 publications

(56 reference statements)

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“…These results imply that the alkaline earth ion bonding contributes significantly to the overall strength of the glasses. A linear increase in microhardness with CFS agrees with findings for RE–AE–Si–(Al)–O–N glasses (where RE is the, rare earth element and AE is the alkaline earth element) …”

Section: Discussionsupporting

confidence: 84%

Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy

Bäck

Ali

Karlsson

et al. 2019

Int J of Appl Glass Sci

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In this article, we investigate the correlation of selected physical properties with structural changes in quaternary mixed modifier alkali/alkaline earth oxide silicate glass systems, focusing either on the mixed alkali effect [(20−x)Na 2 O-xK 2 O-10CaO-70SiO 2 (x = 0, 5, 10, 15, 20)] or on the mixed alkaline earth effect [20Na 2 O-(10−y)CaO-yBaO-70SiO 2 (y = 0, 5, 10)]. A maximum microhardness and packing density, as well as a minimum glass transition temperature were observed for mixed alkali glasses. The mixed alkaline earth glasses do not exhibit any clear extrema in any of the properties studied. The hardness and glass transition temperature decreases, while the density and molar volume increases with increasing BaO content.Raman spectroscopy showed an increase in the Q 3 group compared to the Q 2 and Q 4 groups as the high field strength ions Na + or Ca 2+ are substituted by their low field strength analogs K + or Ba 2+ . In the mixed alkali series, the high field strength ion Na + , seems to push the low field strength ion K + into lower energy sites when present simultaneously, while such an effect is not apparent for the mixed alkaline earth glasses, where the far IR spectra of mixed glasses are equivalent to the weighted averages of the pure glasses. K E Y W O R D Smixed modifier effect, silicate glass, glass transition temperature, hardness, Raman spectroscopy and IR spectroscopy 350 | GRUND BÄCK et al.

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Section: Discussionsupporting

confidence: 84%

Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy

Bäck

Ali

Karlsson

et al. 2019

Int J of Appl Glass Sci

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“…The data indicate that increasing the N content decreases the molar volume and increasing the Mg content increases it. The present results agree with those of previous studies of bulk glasses in the alkaline-earth-Si-O-N systems [12,[32][33] Furthermore, thin films deposit at 100 oC substrate temperature can also be as a protective coating for polymer substrates due to its higher hardness (10 GPa) and reduced elastic modulus (124 GPa).…”

Section: Influence Of Substrate Temperature On Propertiessupporting

confidence: 92%

“…The high nitrogen content in the Mg-Si-O-N thin films as compared to the Ca-Si-O-N thin films[11] prepared under similar conditions might be due to the high affinity of Mg towards nitrogen. A similar trend has been observed in bulk Mg/Ca-Si-O-N glasses[12].…”

supporting

confidence: 86%

“…Thin films in the M2 series have a higher N and lower Mg contents than the M1 and M3 series. The thin films in Mg-Si-O-N system have higher content of N and Mg as compared to the bulk glass prepared by melt quenching or sol-gel techniques in the same system[12,24]. The high nitrogen content in the Mg-Si-O-N thin films as compared to the Ca-Si-O-N thin films[11] prepared under similar conditions might be due to the high affinity of Mg towards nitrogen.…”

mentioning

confidence: 94%

“…Bulk Mg-Si-(Al)-O-N glasses [12][13][14][15] are commonly prepared by melt quenching and exhibit superior mechanical, chemical, thermal and optical properties compared to their oxide counterpart glasses. However, as yet, the gains in properties are not worth to compensate for the increased efforts required to synthesized and process large quantities of bulk glasses.…”

Section: Introductionmentioning

confidence: 99%

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Optical and mechanical properties of amorphous Mg-Si-O-N thin films deposited by reactive magnetron sputtering

Ali

Paul

Magnusson

et al. 2019

Surface and Coatings Technology

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In this work, amorphous thin films in Mg-Si-O-N system typically containing > 15 at.%, Mg and 35 at.%, N were prepared in order to investigate especially the dependence of optical and mechanical properties on Mg composition. Reactive RF magnetron co-sputtering from magnesium and silicon targets were used for the deposition of Mg-Si-O-N thin films. Films were deposited on float glass, silica wafers and sapphire substrates in an Ar, N2 and O2 gas mixture. X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, spectroscopic ellipsometry, and nanoindentation were employed to characterize the composition, surface morphology, and properties of the films. The films consist of N and Mg contents up to 40 at.% and 28 at.%, respectively and have good adhesion to substrates and are chemically inert. The thickness and roughness of the films increased with increasing content of Mg. Both Hardness (16 -21 GPa) and reduced elastic modulus (120 -176 GPa) are strongly correlated with the amount of Mg content. The refractive index up to 2.01 and extinction coefficient up to 0.18 were found to increase with Mg content. The optical band gap (3.1 -4.3) decreases with increasing the Mg content. Thin film deposited at substrate temperature of 100 o C shows a lower value of hardness ( 10 GPa), refractive index (1.75), and higher values of reduced elastic modulus (124 GPa) as compared to the thin film deposited at 310 o C and 510 o C respectively, under identical synthesis parameters.

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Two-step synthesis of niobium doped Na–Ca–(Mg)–P–Si–O glasses

et al. 2021

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Niobium doped biosolubility glasses in the Na–Ca–(Mg)–P–Si–O system were prepared by using an untypical two-step synthesis route. The parent glass was melted in air atmosphere at 1350 °C followed by re-melting the glass in Nb crucible with the addition of metallic Mg/Ca powder in the nitrogen atmosphere. The second melting step was carried out at 1450–1650 °C, using an induction furnace. The topography and structure of the obtained glasses were characterized by confocal microscopy, X-ray powder diffraction and infrared spectroscopic techniques. The chemical compositions were examined by energy-dispersive X-ray spectroscopy (EDS). The glasses were found to be of grayish color, X-ray amorphous and having network connectivity between ~ 2.5 and 2.7. The network connectivity of re-melted glasses was lower than the one of the parent glass. The glass structure consists of a highly disrupted silicate network of predominantly Q2 groups as well as isolated orthophosphate tetrahedra. The parent glass contains nanocrystallites consisted of apatitic PO43− groups. The re-melted glasses contain non-apatitic or amorphous calcium phosphates. The obtained glass transition temperatures range from 530 to 568 °C and exhibit higher values for glassed doped with Ca metal. These glasses have improved thermal stability as compared to reference bioglasses. The biosolubility test in phosphate buffered saline solution (PBS) confirms that the glasses have biosolubility properties and HAp formation on the surfaces was observed.

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

Cited by 42 publications

References 37 publications

Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy

Mixed alkali/alkaline earth‐silicate glasses: Physical properties and structure by vibrational spectroscopy

Optical and mechanical properties of amorphous Mg-Si-O-N thin films deposited by reactive magnetron sputtering

Two-step synthesis of niobium doped Na–Ca–(Mg)–P–Si–O glasses

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