Thermodynamic modeling of the Al–Si–Sr–O quaternary system

Zhang, C.; Zhang, F.; Cao, Wei; Chang, Y. A.

doi:10.1016/j.intermet.2010.01.032

Cited by 11 publications

(16 citation statements)

References 36 publications

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“…Only the binary phase equilibrium diagrams for SrO‐Al 2 O 3 , SrO‐SiO 2 , and SiO 2 ‐Al 2 O 3 , forming the edges of the ternary diagram, are available. Furthermore, we are only aware of one modeling attempt to calculate the liquidus surface of the SrO‐Al 2 O 3 ‐SiO 2 system …”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, we are only aware of one modeling attempt to calculate the liquidus surface of the SrO-Al 2 O 3 -SiO 2 system. 20 In this article, we therefore determine the phase equilibria (liquidus temperature and primary devitrification phase) for a total of 24 compositions within the SrO-Al 2 O 3 -SiO 2 system. We focus on the compositional regions of commercial interest for industrial glass production, that is, with SiO 2 content around 65-80 mol% and Al 2 O 3 content around 10-15 mol%.…”

Section: Introductionmentioning

confidence: 99%

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Liquidus Temperature of SrO‐Al₂O₃‐SiO₂ Glass‐Forming Compositions

Abel

Morgan

Mauro

et al. 2013

Int J of Appl Glass Sci

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Despite the important role of strontium aluminosilicate glasses in various technologies, there is no available phase diagram for this ternary system in the ACerS‐NIST Phase Equilibria Diagrams Database. Establishing the liquidus surface (liquidus temperature Tliq and primary devitrification phase) is crucial for glass composition design, because the liquidus temperature is intimately connected with the glass‐forming ability of the melt. In this work, we have determined the liquidus surface by X‐ray diffraction phase analyses of isothermally reacted samples from powder mixtures of 24 compositions. In the composition range of interest for industrial glasses, Tliq tends to decrease with increasing strontium‐to‐alumina ratio. We find that cristobalite, mullite, and slawsonite are the dominant devitrification phases for the compositions with high SiO2, SiO2+Al2O3, and SrO contents, respectively. By comparison with the phase diagrams for CaO‐Al2O3‐SiO2 and MgO‐Al2O3‐SiO2 systems, we have found that for the highest [RO]/[Al2O3] ratios, Tliq exhibits a minimum value for R = Ca. Based on the phase diagram established here, the composition of glass materials, for example, for liquid crystal display substrates, belonging to the SrO‐Al2O3‐SiO2 family may be designed with a more exact control of the glass‐forming ability by avoiding the regions of high liquidus temperature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Liquidus Temperature of SrO‐Al₂O₃‐SiO₂ Glass‐Forming Compositions

Abel

Morgan

Mauro

et al. 2013

Int J of Appl Glass Sci

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“…Melting temperature of SrO is 2930 K 17 and that of Al 2 O 3 is 2327 K. 17 However, in modeling of the phase diagram of this system, these compounds were considered as metastable and were not included in the optimization since they had insufficient proofs of stability or were close in composition to the compounds that were reliably identified. [14][15][16] The optimization of the phase equilibria in the SrO-Al 2 O 3 system in studies [14][15][16] sometimes led to different conclusions on melting patterns of strontium aluminates. Ye et al 14 studied the SrO-Al 2 O 3 system using the CALPHAD approach 18 for the first time.…”

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confidence: 99%

“…The 4SrOÁAl 2 O 3 compound was stable only within a certain temperature range and had two phases. 14,15 Ye et al 14 also considered two polymorphic modifications of SrO-Al 2 O 3 with a temperature of phase transition of 932 K.…”

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confidence: 99%

Mass spectrometric study and modeling of the thermodynamic properties of SrO–Al₂O₃ melts at high temperatures

Stolyarova

Vorozhtcov

Лопатин

et al. 2023

Rapid Comm Mass Spectrometry

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Rationale The SrO–Al2O3 system holds promise as a base for a wide spectrum of advanced materials, which may be synthesized or applied at high temperatures. Therefore, studying vaporization and high‐temperature thermodynamic properties of this system is of great practical importance. Methods Samples of the SrO–Al2O3 system were obtained by solid‐state synthesis and identified by X‐ray fluorescence analysis, X‐ray phase analysis, scanning electron microscopy, electron probe microanalysis, simultaneous thermal analysis, and thermogravimetric analysis. The thermodynamic properties of the SrO–Al2O3 system were studied by the Knudsen effusion mass spectrometric (KEMS) method and were fitted by the Redlich–Kister and Wilson polynomials. The thermodynamic values obtained were also optimized within the generalized lattice theory of associated solutions (GLTAS). Results The vapor composition, temperature, and concentration dependences of the partial vapor pressures over the samples under study as well as the SrO activities in melts of the SrO–Al2O3 system were determined by the KEMS method. Usage of the Redlich–Kister and Wilson polynomials allowed calculation of the excess Gibbs energies, enthalpies of mixing, and excess entropies in the concentration range 0–33 mol% of SrO at temperatures of 2450 and 2550 K. Conclusions Significant negative deviations from the ideality were observed in the melts of the SrO–Al2O3 system at 2450, 2550, and 2650 K. The Wilson polynomial was found to be the optimal approach to describe the thermodynamic properties in the system studied. Optimization of the experimental data using the GLTAS approach allowed the characteristic features of the thermodynamic description of the SrO–Al2O3 system to be elucidated and explained.

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“… It should be noted that, an intermediate mullite phase (3Al 2 O 3 ·2SiO 2 ) within the Al 2 O 3 –SiO 2 oxide system can be observed in a pure crystalline form at T ≥ 460 K and hence, has not been considered in the present calculation. However, as has been observed in the previous work for the growth of ultra‐thin oxide‐films on Al–Mg alloys, a possibility of amorphous to crystalline transition in these grown oxide films toward higher T cannot be overruled. …”

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confidence: 99%

Role of Interface(s) for the Growth of Ultra‐Thin Amorphous Oxides on Al–Si Alloys: A Thermodynamic Analysis

Panda

Manwani

2014

J. Am. Ceram. Soc.

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This study presents a thermodynamic analysis to predict the type of initial, amorphous oxide overgrowth (i.e., am-Al 2 O 3 or am-SiO 2 ) on bare Al-Si alloy substrates. This analysis have taken into account the energies associated with both its interfaces (interface between the Al-Si alloy substrate and the thin oxide film and interface between the thin oxide film and vacuum) along with the bulk Gibbs free energy of oxide formation. This developed analysis is then applied for various parameters, such as, Si alloying element content at the substrate/oxide interface, the growth temperature, the oxide film thickness (up to 1 nm), and various low-index crystallographic surfaces of the substrate. It is found that am-SiO 2 overgrowth is thermodynamically preferred for a combination of lower oxide film thickness, lower growth temperature, and lower Si alloying content at the alloy/ oxide interface. This is because of the overcompensation of the lower energies of both the interfaces over the bulk Gibbs free energy. Furthermore, it is found that for all cases, am-Al 2 O 3 forms a more stable interface with Al-Si alloy than am-SiO 2.It should be noted that, an intermediate mullite phase (3Al 2 O 3 Á2SiO 2 ) within the Al 2 O 3 -SiO 2 oxide system can be observed in a pure crystalline form at T ≥ 460 K [32][33][34] and hence, has not been considered in the present calculation. However, as has been observed in the previous work for the growth of ultra-thin oxide-films on Al-Mg alloys 21,35 , a possibility of amorphous to crystalline transition in these grown oxide films toward higher T cannot be overruled. 465

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Thermodynamic modeling of the Al–Si–Sr–O quaternary system

Cited by 11 publications

References 36 publications

Liquidus Temperature of SrO‐Al₂O₃‐SiO₂ Glass‐Forming Compositions

Liquidus Temperature of SrO‐Al₂O₃‐SiO₂ Glass‐Forming Compositions

Mass spectrometric study and modeling of the thermodynamic properties of SrO–Al₂O₃ melts at high temperatures

Role of Interface(s) for the Growth of Ultra‐Thin Amorphous Oxides on Al–Si Alloys: A Thermodynamic Analysis

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Thermodynamic modeling of the Al–Si–Sr–O quaternary system

Cited by 11 publications

References 36 publications

Liquidus Temperature of SrO‐Al2O3‐SiO2 Glass‐Forming Compositions

Liquidus Temperature of SrO‐Al2O3‐SiO2 Glass‐Forming Compositions

Mass spectrometric study and modeling of the thermodynamic properties of SrO–Al2O3 melts at high temperatures

Role of Interface(s) for the Growth of Ultra‐Thin Amorphous Oxides on Al–Si Alloys: A Thermodynamic Analysis

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Product

Resources

About

Liquidus Temperature of SrO‐Al₂O₃‐SiO₂ Glass‐Forming Compositions

Liquidus Temperature of SrO‐Al₂O₃‐SiO₂ Glass‐Forming Compositions

Mass spectrometric study and modeling of the thermodynamic properties of SrO–Al₂O₃ melts at high temperatures