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Zaitsev, A. I.; Zaitseva, N. E.

doi:10.1023/a:1015242921061

Cited by 13 publications

(20 citation statements)

References 3 publications

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“…Since the melting points of the references were close or were within the accessible temperature interval, the thermocouples were calibrated directly in the course of the experiments. The ion current (vapor pressures) temperature dependences of Ni, Co, or Ti were reproducible in all cases and agreed well with data reported by Zaitsev and Zaitseva [6] and Gurvich et al [7] and with those measured in this work. The data on the vapor pressures from the preceding two sources [6,7] were used in the subsequent computations.…”

Section: Experimental Methodssupporting

confidence: 92%

A thermodynamic study of liquid Fe-Si-B alloys; an influence of ternary associates on a liquid → glass transition

Зайцев

Zaitseva

Kodentsov

2003

Metall Mater Trans B

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Knudsen-cell mass spectrometry and the integral variant of effusion method have been applied to investigate the thermodynamic properties of liquid Fe-Si-B alloys at temperatures from 1423 to 1894 K over concentration intervals of 9-88.8 at. pct Fe, 2.6-81.4 at. pct Si, and 7.5-50 at. pct B.The activity values of the components and the Gibbs energy of the Fe-Si-B melt formation have been determined over a wide temperature-concentration range. The concentration and temperature dependences of the thermodynamic functions of liquid Fe-Si-B alloy have been described adequately within the ideal associated-solution model under the assumption that binary and ternary associates exist in the melt. The relevance of the model was tested in the undercooled region. The glassforming ability of the melt as shown could be interpreted in terms of the thermodynamic parameters of the association reactions. A specific role of ternary interaction was clarified.

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Section: Experimental Methodssupporting

confidence: 92%

A thermodynamic study of liquid Fe-Si-B alloys; an influence of ternary associates on a liquid → glass transition

Зайцев

Zaitseva

Kodentsov

2003

Metall Mater Trans B

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“…The temperature functions of the ion currents (vapor pressures) of these elements were well reproducible in all cases and were in good agreement with the thermodynamic databank IVTANTERMO 21) and the latest report on Ni vapor pressure. 22) Therefore, the data for the reference substances from these sources were used in vapor pressure calculations. The latter were performed using the universally known equations of the Knudsen-cell mass spectrometry.…”

Section: Experimental Procedures and Materialsmentioning

confidence: 99%

Potentialities of Simultaneous Removal of Tin and Copper from Molten Iron through Evaporation

et al. 2004

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The Knudsen-cell mass spectrometry was used to study evaporation and thermodynamics of pure liquid Sn, Fe-Sn and Fe-Cu-Sn molten alloys containing up to 20.3 mol% Sn or up to 5 mol% Cu and Sn in a wide temperature range. The thermodynamic properties of the binary melt were approximated by means of the subregular solution model with temperature dependent parameters. The properties of the ternary melt were represented with accuracy not worse than the experimental one by combination of the characteristics of the binary constituents. The obtained results were applied to assessment of the potentialities of simultaneous copper and tin removal from molten steel by means of evaporation. Combination of vacuum treatment of a 160-tons ladle with blowing through the molten metal neutral gases was considered as an example. Two processes are responsible for removal of copper and tin: transfer into gas bubbles, free-rising from the ladle bottom to its surface, and evaporation from molten metal surface, turbulized by blowing-through gas. It was shown that duration of the treatment necessary for a decrease in Cu concentration from 0.6 to 0.3 wt% amounts to ϳ1.5 h and is not practically affected by variations in tin content in the range of 0.01 to 0.6 wt%. During this time concentration of tin changes insignificantly at any initial content: from 0.6 to ϳ0.51, from 0.1 to ϳ0.086 or from 0.01 to ϳ0.0086 wt%.

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“…The samples were prepared from nickel (99.9%) and lanthanum (99.9%). Experimental procedures were analogous to those described elsewhere [10][11][12].Ni-La crystalline alloys have extremely low partial pressures of the components in a major portion of the temperature and composition range. The routine strategy of Knudsen mass spectrometry allowed us to determine only p (Ni) for the heterogeneous equilibrium fields Ni 5 La + Ni 17 La 4 and Ni 17 La 4 + β Ni 7 La 2 (Table 1) of the phase diagram of the Ni-La system [1].…”

mentioning

confidence: 99%

“…The samples were prepared from nickel (99.9%) and lanthanum (99.9%). Experimental procedures were analogous to those described elsewhere [10][11][12].…”

mentioning

confidence: 99%

“…The routine strategy of Knudsen mass spectrometry allowed us to determine only p (Ni) for the heterogeneous equilibrium fields Ni 5 La + Ni 17 La 4 and Ni 17 La 4 + β Ni 7 La 2 (Table 1) of the phase diagram of the Ni-La system [1]. The measured vapor pressures (ion current intensities) of nickel over alloys and the metal [12] and Gibbs energies of Ni phase transitions taken from [13] allowed us to calculate nickel partial thermodynamic functions relative to the completely paramagnetic fcc modification (Table 2).…”

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confidence: 99%

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Thermodynamic Investigation of Nickel-Lanthanum Crystalline Alloys

Зайцев¹,

Zaitseva²,

Maltsev³

et al. 2005

Dokl Phys Chem

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Nickel-lanthanum alloys are the basis of a large number of bulk amorphous metallic materials, and their intermetallic compounds are of interest as hydrogen storage materials. To analyze the kinetics and equilibria of reactions with hydrogen and establish the criteria predetermining the possibility for a melt to produce glasses, its stability characteristics, and further transformations, including the formation of nanocrystals, accurate data on the thermodynamic properties of nickel-lanthanum crystalline compositions are essential. Nevertheless, the thermodynamic characteristics of the intermediate phases in the Ni-La system have not hitherto been found with the required accuracy [1][2][3][4][5][6][7][8][9]. Available data are in conflict concerning even the number and composition of the compounds that occur in the crystalline state [1,2].In the present work, the vapor composition and thermodynamic properties of crystalline nickel-lanthanum alloys were studied by Knudsen mass spectrometry in a wide temperature range (685-1547 K) and over the entire composition range. Saturated vapor pressures were measured using Knudsen double cells made of tantalum, niobium, or molybdenum. To prevent an interaction of alloys and the standard used with the material of effusion cells, zirconium or titanium diboride was deposited on their surfaces by plasma spraying. The references were Ag (99.99%), Cu (99.999%), Mn (99.99%), or Ca (99.9%). The samples were prepared from nickel (99.9%) and lanthanum (99.9%). Experimental procedures were analogous to those described elsewhere [10][11][12].Ni-La crystalline alloys have extremely low partial pressures of the components in a major portion of the temperature and composition range. The routine strategy of Knudsen mass spectrometry allowed us to determine only p (Ni) for the heterogeneous equilibrium fields Ni 5 La + Ni 17 La 4 and Ni 17 La 4 + β Ni 7 La 2 (Table 1) of the phase diagram of the Ni-La system [1]. The measured vapor pressures (ion current intensities) of nickel over alloys and the metal [12] and Gibbs energies of Ni phase transitions taken from [13] allowed us to calculate nickel partial thermodynamic functions relative to the completely paramagnetic fcc modification (Table 2).To extend the measuring range to lower temperatures, a procedure [10, 11] based on initiating and studying equilibria that involve volatile reaction products was used. The activity (partial Gibbs energy) of lanthanum in the crystalline alloys with nickel varies in a wide range. This gives no possibility to select a single universal additive to investigate these alloys over the entire concentration range, as was shown in the calculations and preliminary runs performed. This can be done by initiating and studying equilibria of reactions with LiF and MgF 2 . These compounds interact with Ni-La alloys by the reactions (1) (2) Equilibrium (1) was explored earlier in studying the lanthanum-aluminum alloys [10]. The reaction of MgF 2 with lanthanum metal was extremely violent and resulted in p (Mg) values esse...

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Cited by 13 publications

References 3 publications

A thermodynamic study of liquid Fe-Si-B alloys; an influence of ternary associates on a liquid → glass transition

A thermodynamic study of liquid Fe-Si-B alloys; an influence of ternary associates on a liquid → glass transition

Potentialities of Simultaneous Removal of Tin and Copper from Molten Iron through Evaporation

Thermodynamic Investigation of Nickel-Lanthanum Crystalline Alloys

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