Thermal properties of A1203 in the melting region

Stankus, S. V.; Tyagel'sky, P.V.

doi:10.1007/bf01441588

Cited by 26 publications

(8 citation statements)

References 9 publications

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“…The exception is the data of [19]. However, it was previously shown [25] that the method of unfed casting always resulted in considerably underestimated values of volume changes during crystallization. The mean of the results of the other studies practically coincides with the value of δρ f obtained in our study, which is why we recommend it as a reference value.…”

Section: Discussionmentioning

confidence: 63%

Density and Thermal Expansion of High Purity Nickel over the Temperature Range from 150 K to 2030 K

et al. 2015

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The paper presents the results of an investigation of the nickel density and thermal expansion over the temperature range from 145 K to 2030 K. The measurements have been carried out by using the dilatometer method and the γ -ray attenuation technique (gamma method). The errors of the density and coefficients of thermal expansion measurements are estimated to be within 0.05 % to 0.25 % and 1 % to 2.5 %, respectively. The accuracy of determination of the volumetric thermal expansion coefficient of the melt by the γ -ray attenuation technique is substantiated. The density change on melting (4.70 ± 0.15) % has been directly measured. The temperature dependences and reference tables of the volumetric properties of solid and liquid nickel have been developed. A comparison of the obtained results with literature data has been made.

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Section: Discussionmentioning

confidence: 63%

Density and Thermal Expansion of High Purity Nickel over the Temperature Range from 150 K to 2030 K

et al. 2015

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“…As shown in Figure 4, the available data are rather scattered. According to Stankus and Tyagelsky, [38] this scattering may be due to the presence of gas bubbles in the melt. Glorieux et al [39] emphasize that a possible chemical pollution of the liquid is inherent to density measurements with crucibles.…”

Section: Liquid Al 2 Omentioning

confidence: 99%

“…[29][30][31][32][33][34][35][36][37][38][39] (For the sake of clarity, no error bars are [12] and [13]) of cation M 3+ (or M 2+ ) in pure liquid MX 3 (or MX 2 ) vs the ionic radius (octahedral geometry) [21] of cation M 3+ (or M 2+ ) at 1000°C. [29] e, Kirshenbaum and Cahill; [30] 5 , Zubarev et al; [31] D, Mitin and Nagibin; [32] h, Rasmussen and Nelson; [33] , Rasmussen; [34] + , ShpilÕrain et al; [35] S, Granier and Heurtault; [36] ·, Hara et al; [37] d, Stankus and Tyagelsky; [38] and m, Glorieux et al [39] shown.) In spite of the high melting temperature of Al 2 O 3 (2327 K), many experimental density studies were conducted.…”

Section: Liquid Al 2 Omentioning

confidence: 99%

A Density Model Based on the Modified Quasichemical Model and Applied to the NaF-AlF3-CaF2-Al2O3 Electrolyte

Robelin¹,

Chartrand²

2007

Metall Mater Trans B

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A theoretical model for the density of multicomponent inorganic liquids based on the modified quasichemical model has been presented in a previous article. In the present article, this model is applied to the NaF-AlF 3 -CaF 2 -Al 2 O 3 electrolyte. By introducing in the Gibbs energy of the liquid phase, temperature-dependent molar volume expressions for the pure fluorides and oxides, and pressure-dependent excess parameters for the binary (and sometimes higher-order) interactions, it is possible to reproduce, and eventually predict, the molar volume and the density of the multicomponent liquid phase using standard interpolation methods. All available density data for the NaF-AlF 3 -CaF 2 -Al 2 O 3 liquid were collected and critically evaluated, and optimized pressure-dependent model parameters have been found. This new volumetric model can be used with Gibbs energy minimization software, to calculate the molar volume and the density of cryolite-based melts used for the electroreduction of alumina in Hall-He´roult cells.

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“…The advantage of this method is its universality and, in particular, the possibility of direct measurement of the density changes during the solid-liquid phase transition. Details of the experimental equipment and procedures have been described elsewhere [4,5]. For the ␥-ray source, we used the 137 Cs isotope having an activity of 240 GBq and a quanta energy of 662 keV.…”

Section: Methodsmentioning

confidence: 99%