High temperature calorimetric examination of enthalpies of mixing in liquid (gadolinium–germanium–manganese) alloys

Kanibolotsky, Dmitry S.; Kotova, N. V.; Bieloborodova, Olena A.; Lisnyak, Vladyslav V.

doi:10.1016/j.jct.2005.09.002

Cited by 2 publications

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“…The projections of isolines of the integral enthalpies of mixing of the ternary Ge-Mn-Gd alloys at 1830 K (kJ•mol-1 ) in comparison with experimental values (individual characters, indicated in figure) obtained for this ternary system[7] FromFigure 1one can see that the mix  H surface in this system gradually decreases from the Mn-rich corner to the Ge-Gd side of the concentration triangle. The minimum value of the enthalpy of mixing of the ternary liquid alloys at the composition close to those of the most stable intermetallics in the Ge-Gd system.…”

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confidence: 91%

“…Rare earth intermetallic compounds in ternary RE-Mn-Ge systems (where RE -rare earth metal), in particular GdMnGe, GdMn2Ge2, Gd3Mn4Ge4 and GdMn6Ge6 [1][2][3][4][5] adequately describe the enthalpies of mixing in the constituent binary systems at high temperature, namely: the data from Ref. [11] obtained at 1585 K for the Ge-Mn system (according to [7] and [10]); the data from Ref.…”

Section: Introductionmentioning

confidence: 99%

“…[12] obtained at 1973 K for the Ge-Gd system (according to [7]); the data from Ref. [8] at 1650 K for the Gd-Mn system (according to [9]).…”

Section: Introductionmentioning

confidence: 99%

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Thermochemical properties and glass forming tendency modeling for the ternary Ge–Mn–Gd melts

2019

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Information on the thermochemical properties may be useful for predicting of the concentration regions of easy glass formation in multicomponent alloys. In present investigation the integral enthalpies of mixing for the Ge–Mn–Gd melts were determined for the entire concentration interval at 1830 K using the Redlich-Kister-Muggianu method. GFT values for binary and ternary alloys of this system were calculated. Size mismatch entropy was estimated within the frameworks of hard spheres model. On the basis of performed calculations the concentration regions in which the melts of the Ge–Mn–Gd system can demonstrate considerable tendency to easy glass formation were suggested.

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confidence: 91%

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confidence: 99%

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Thermochemical properties and glass forming tendency modeling for the ternary Ge–Mn–Gd melts

2019

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MODELING OF THERMODYNAMIC PROPERTIES OF THE MELTS OF TERNARY Ge-Mn-Gd SYSTEM

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Kotova

Usenko

2019

Bull. T. Shevchenko Nat. Univ. Kyiv. Chem.

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In the present work, the Gibbs energies of mixing of liquid alloys of the Ge-Mn-Gd ternary system were determined, which was made on the basis of an analysis of published data on the thermodynamic properties of liquid alloys of boundary binary systems that form the ternary Ge-Mn-Gd, as well as on the basis of the model calculations in these binary systems. To determine the activities of the components, the Gibbs energies of mixing, and the enthalpies of mixing of liquid alloys of the Ge-Mn(Gd) systems, for which alloying process is accompanied by significant heat release, an ideal associated solution model was applied. For the melts of the Mn-Gd system, which are characterized by rather insignificant exothermic effects, a model of regular solutions was used. The surface of the Gibbs energy of mixing for the alloys of the Ge-Mn-Gd ternary system has been determined on the basis of the concentration dependences of the Gibbs energies of mixing obtained for constituent binary systems under the assumption of additivity of pair interactions using the Redlich-Kister-Muggianu method. The obtained topology of the Gibbs energy isolines projections is compared with the thermochemical properties of liquid alloys of this system that we have determined earlier. A comparative analysis of the topology of these surfaces in the Ge-Mn-Gd system led to the conclusion that the surfaces of ΔG and ΔmH monotonically decrease from the manganese-rich angle of the diagram towards the Ge-Gd side of the concentration triangle. The minimum value of the thermodynamic characteristics of mixing of the ternary liquid alloys corresponds to the composition, which coincides with the composition of the most stable intermetallic compound in the Ge-Gd system. From the course of isolines of free energies and integral enthalpies of mixing, one can also conclude about the influence of a short-range order, existed in the Ge-Mn system near the composition with a mole fraction of mangan greater than 0.7, on the properties of ternary alloys in the vicinity of this composition. Thus, the topology of isolines and the large exothermic values of the obtained thermodynamic properties allow us to make a reasonable conclusion that the strong interaction between unlike components inherent in the Ge-Gd system in the solid state is also maintained for liquid alloys of the Ge-Mn-Gd system.

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High temperature calorimetric examination of enthalpies of mixing in liquid (gadolinium–germanium–manganese) alloys

Cited by 2 publications

References 55 publications

Thermochemical properties and glass forming tendency modeling for the ternary Ge–Mn–Gd melts

Thermochemical properties and glass forming tendency modeling for the ternary Ge–Mn–Gd melts

MODELING OF THERMODYNAMIC PROPERTIES OF THE MELTS OF TERNARY Ge-Mn-Gd SYSTEM

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