Phase equilibria investigations and thermodynamic modeling of the system Bi2O3–Al2O3

Oudich, Fayssal; Nugent, David; Mathieu, Sandrine; Vilasi, Michel

doi:10.1016/j.jnucmat.2014.10.051

Cited by 8 publications

(3 citation statements)

References 44 publications

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“…An analysis of high-temperature X-ray diffraction data (Fig. 3) and elemental analysis of the samples, which showed a sharp decrease in the bismuth content at processing temperatures above 900 • C, evidence that bismuth aluminate Bi 2 Al 4 O 9 decomposition at these temperatures is accompanied by melting and evaporation of bismuth oxide Bi 2 O 3 , which is consistent with the data from phase diagrams [36][37][38].…”

Section: Resultssupporting

confidence: 86%

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Thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6

Elovikov¹,

Proskurina²,

Tomkovich³

et al. 2022

Nanosystems: Phys. Chem. Math.

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A nanocrystalline powder of the waylandite-structured bismuth hydroaluminophosphate was obtained under hydrothermal conditions at 200 • C, 7 MPa and pH 7, and characterized by X-ray diffractometry, scanning electron microscopy (SEM), and energy dispersive microanalysis (EDAX). The simultaneous thermal analysis and high-temperature X-ray diffractometry have shown that the crystal-chemical formula of this compound can be represented as BiAl 3 (PO 4 ) 2 O(OH) 4 •(H 2 O). This compound retains its structure and crystallite size (∼65 nm) up to about 500 • C. It has been determined that the decomposition of this compound in the 540-800 • C range results in the formation of Bi 2 O 3 , Bi 2 Al 4 O 9 and AlPO 4 phases. At temperatures above 800 • C, a complete thermal decomposition of Bi 2 Al 4 O 9 and the formation of crystalline α-Al 2 O 3 occur in this system, while Bi 2 O 3 keeps evaporating during the isothermal exposure. KEYWORDS nanocrystals, waylandite-structured, BiAl 3 (PO 4 ) 2 O(OH) 4 •(H 2 O), thermal stability, hydrothermal synthesis, nature-like technologies. ACKNOWLEDGEMENTS X-ray diffraction studies and elemental analyses of samples were performed employing the equipment of the Engineering Center of the

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Section: Resultssupporting

confidence: 86%

“…Endothermic peaks in the 810-885 • C range in the DTA curve (Fig. 3) are associated, as can be concluded from the literature data [36][37][38], with the processes of eutectic phase melting and, possibly, phase transitions in the Bi 2 O 3 -Al 2 O 3 -P 2 O 5 system.…”

Section: Resultssupporting

confidence: 71%

Thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6

Elovikov¹,

Proskurina²,

Tomkovich³

et al. 2022

Nanosystems: Phys. Chem. Math.

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“…Twenty gram batches were heated in a platinum crucible at 50°C steps for 30‐minutes intervals in the range of 650‐1050°C for compositions with 40 mol% SiO 2 and 650‐1000°C for all other glasses. This heating process moderated the interaction of batch powders (with liquidus temperatures for Bi 2 O 3 ‐B 2 O 3 , Bi 2 O 3 ‐SiO 2 , and Bi 2 O 3 ‐Al 2 O 3 systems at 646, 870, and 1075°C, respectively), producing complete dissolution of powder precursors and resulting in much more uniform colors in solid samples. Portions of each melt were poured into pre‐heated stainless‐steel molds (pre‐heated at 350°C for 30 minutes to prevent sample cracking during the pour) for viscosity sample preparation while the remnant was poured onto a stainless‐steel plate.…”

Section: Methodsmentioning

confidence: 98%

Viscosities and working region predictions for bismuth aluminoborosilicate glasses

Gardner

Riley

Elliott

et al. 2018

Int J of Appl Glass Sci

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Bismuth aluminoborosilicate glasses were prepared using a standard melt-quench technique, and the viscosity and thermal properties were measured and analyzed. Electron microprobe analysis was used to examine glass homogeneity. Fragility was calculated based on Mauro-Yue-Ellison-Gupta-Allan model fits to the viscosity curves. The system is characterized by an open structure with high fragility (44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)(58)(59). Based on microanalysis and differential scanning calorimetry results, the addition of network intermediate Al 2 O 3 appears to mitigate both phase separation and crystallization. From thermal property data, mixture models were created to predict the glass transition temperatures and softening temperatures as functions of composition. Based on K-fold validation findings, the first-order mixture model predictions of glass transition and softening appear to approximate actual values better than models with any additional second-order terms.

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Thermal Analyses of Silver-Based Sulfosalts in Air

Tesfaye

Lindberg

2017

The Minerals, Metals &Amp; Materials Series

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Phase equilibria investigations and thermodynamic modeling of the system Bi2O3–Al2O3

Cited by 8 publications

References 44 publications

Thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6

Thermal stability of the waylandite-structured nanocrystalline BiAl3(PO4)2(OH)6

Viscosities and working region predictions for bismuth aluminoborosilicate glasses

Thermal Analyses of Silver-Based Sulfosalts in Air

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