Search

Your search keyword '"Parodi, N."' showing total 140 results
Start Over Author "Parodi, N."
140 results on '"Parodi, N."'

25. Formation and Decomposition Process of the Filled Skutterudite Smy(FexNi1−x)4Sb12 (0.40 ≤ x ≤ 1) as Revealed by Differential Thermal Analysis.

Author

Latronico, G., Artini, C., Parodi, N., and Carlini, R.

Subjects
DIFFERENTIAL thermal analysis, SKUTTERUDITE, THERMOELECTRIC materials, HEUSLER alloys, RARE earth metals, ANTIMONIDES
Abstract

Filled skutterudites are among the most promising thermoelectric materials, and the obtainment of monophasic samples is crucial for the study of their transport properties. In this work, a differential thermal analysis study was performed on samples belonging to the Smy(FexNi1-x)4Sb12 system with the aim to determine the most proper annealing temperature to possibly obtain skutterudite monophasic samples, and to study the effect of Sm addition on the thermodynamics of the Fe-Ni-Sb system. Samples were prepared through the traditional procedure consisting in melting-quenching-annealing the starting elements. DTA analyses were carried out on annealed samples, and results were interpreted using the Fe25Sb75-Ni25Sb75 pseudobinary phase diagram taken from the literature as a starting point. They reveal that 870 K is the best annealing temperature, being the formation of a liquid phase just above this point; moreover, the Sm introduction results in widening the one-phase skutterudite stability region toward both higher temperatures and higher Fe concentrations compared with the Sm-free system. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

27. Thermochemistry of Pd-In, Pd-Sn and Pd-Zn alloy systems

Author

Amore S., Delsante S., Parodi N., and Borzone G.

Subjects
Enthalpy of formation, Pd alloys, Alloy thermochemistry, High temperature calorimetry
Abstract

The standard enthalpy of formation of several Pd-M alloys (M= In, Sn and Zn) has been measured using a high temperature direct drop calorimeter. The reliability of the calorimetric results has been determined and supported by using different analytical techniques: light optical microscopy, scanning electron microscopy equipped with electron probe microanalysis (EPMA with EDS detector) and X-ray powder diffraction analysis. The values of fH (kJ/mol atoms) for the following phases were obtained for the formation in the solid state at 300 K: PdIn (49 at.%In): −69.0±1.0; Pd2In3 −57.0±1.0; Pd3In7: −43.0±1.0; PdSn2: −50.0±1.0; Pd2Zn9 (77 at.%Zn): −33.7±1.0; Pd2Zn9 (78 at.%Zn): −34.0±1.0; Pd2Zn9 (80 at.%Zn): −35.0±1.0. The results show exothermic values which increase from the Pd-Zn to the Pd-Sn and Pd-In systems; the data obtained have been discussed in comparison with those available in literature.

Published
2009

50. Thermodynamic Properties of Me<INF>2</INF>Ni<INF>17</INF> (Me = Sm, Dy, and Yb) Intermetallics by Solid Electrolyte Cells under Effusion Conditions

Author

Pascasio, F. Di, Gozzi, D., Parodi, N., and Borzone, G.

Abstract

The purpose of this work is to contribute to rare earth/3d metal thermodynamics of systems not experimentally determined prior to this research. The thermodynamics of the Ni-rich phase, Me2Ni17, in the binary systems Me-Ni, with Me = Sm, Dy, and Yb, has been studied in the temperature range from 900 to 1200 K by a new experimental setup based on solid-state galvanic cells with CaF2 single crystal as the solid electrolyte. This is particularly useful when the vapor pressure of one of the components of the electrochemical cell is high at the working temperature. The electromotive force method has been adopted to obtain the thermodynamic properties of the intermetallics under investigation. Their Δf%@mt;sys@%%@ital@%H%@rsf@%%@sx@%T%@be@%θ%@sxx@%%@mx@% values have been found to be −14.6 ± 0.5, −18.5 ± 0.1, and −17.0 ± 0.1 kJ/mol atoms, respectively, for Sm2Ni17 and Dy2Ni17 at T = 298 K and Yb2Ni17 at T = 990 K. These values agree well with the calculated values obtained through the Miedema model. Values of the activity of Me in the Ni solid solution in thermodynamic equilibrium with the respective Me2Ni17 phase were calculated at 1000 K to be 6.8 × 10-10, 4.8 × 10-10, and 1.5 × 10-10, respectively, for Sm, Dy, and Yb. The activity against the Me atomic volume was also investigated together with the physical meaning of the partial excess free energy change of the Ni solid solution.

Published
2002
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results