Glasses in the<scp>Ba–Si–O–N</scp>System

Ali, Sharafat; Jonson, Bo

doi:10.1111/j.1551-2916.2011.04718.x

Cited by 25 publications

(32 citation statements)

References 62 publications

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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%

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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Section: Influence Of Substrate Temperature On Propertiessupporting

confidence: 92%

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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“…For the Ca‐series, there is the additional effect of losing up to 10‐20 mol% Na 2 O during synthesis by laser melting; this replacement of the monovalent Na + by the stronger cross‐linker Ca 2+ overcomes the observed effect of a slightly increased degree of silicate depolymerization. An increase in T g for both alkaline‐earth and rare‐earth oxide 3,32‐35 as well as oxynitride glasses 6,36‐38 but also for tellurites 39 and phosphate glasses 40‐41 melted in Al 2 O 3 crucibles has been observed in earlier studies. For all the cited cases, a very strong cross‐linking capacity of the added modifier cations may overcome the weakening effect due to network depolymerization.…”

Section: Resultssupporting

confidence: 59%

Synthesis, structural characterization, and thermal properties of Ca‐ and La‐doped soda‐lime glasses by laser melting

Ali

Wójcik

Jonson

et al. 2020

Int J of Appl Glass Sci

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Laser melting techniques have been used in the preparation of unconventional glass compositions with high melting temperatures. Thus, we wanted to test the feasibility of using a CO2 laser in the preparation of nitrogen‐rich oxynitride glasses and nitride silicate glasses. Melting from oxides and metallic raw materials, we wanted to study first glass formation and possible evaporation losses of the glass components. Two glass series were prepared and studied for their structure and thermal properties, one with Ca2+‐ and a higher melting La3+‐doped soda‐lime‐silicate (SLS) series. In less than 3 minutes of laser melting, spheres of up to 6 mm diameter were successfully fabricated. The obtained glass samples were homogeneous and transparent in the visible region. X‐ray diffraction and Raman spectroscopic analysis confirmed the amorphous nature of the synthesized samples. Sodium losses increase as calcium is added to the soda‐lime‐silicate glass. As expected, increasing Ca2+ or La3+ addition lead to increased depolymerization of the silicate network. Moreover, the increases in Tg with the addition of Ca2+ or La3+ ions indicating strengthening of the soda‐lime‐silicate glass by increasing strength of the M‐O bonds of divalent and trivalent ions over monovalent sodium ions, weak Na‐O bonds also resulting in significant evaporation loss during the short laser melting times. The thermal stability decreases upon addition of Ca2+ or La3+ ions to the soda‐lime‐silicate glasses.

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“…Moreover, the newest studies of Nb-containing 45S5 bioactive glasses (up to 1 mol% of Nb 2 O 5 ) characterized them as having angiogenic potential [20]. In our previous paper [5], we have shown that phosphate glasses can dissolute Nb from the crucible material during melting while no Nb was found in silicate glasses [7,8].…”

Section: Introductionmentioning

confidence: 97%

“…In the current paper, a two-step synthesis route (described in [5]) with the addition of Mg/Ca metal and reducing atmosphere is applied, to prepare the potentially bioactive phospho-silicate glasses. This specific preparation technique allows to achieve glasses with unique structure and improved thermal properties due to incorporation of nitrogen into their network (e.g., through the addition of Si 3 N 4 ) [6][7][8][9]. So far it was successfully applied to the preparation of bioactive oxynitride phosphate and [5] oxynitride silicate glasses [4,10].…”

Section: Introductionmentioning

confidence: 99%

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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Glasses in theBa–Si–O–NSystem

Cited by 25 publications

References 62 publications

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

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

Synthesis, structural characterization, and thermal properties of Ca‐ and La‐doped soda‐lime glasses by laser melting

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

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