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Abstract
Cohesive properties are calculated for the AnIr2 and AnRh3 series of intermetallic systems. The positive and negative deviations from Vegard's law found in both series are emphasized. The development of magnetism and 5f localization as a function of increasing actinide atomic number is studied in detail for the two classes of compounds. A relativistic formulation of the Stoner criterion for ferromagnetism is presented and applied to a number of actinide systems. Finally the ferromagnetism of UFe2, NpFe2 and PuFe2 is treated theoretically. For these intermetallic compounds it is found necessary to implement all three Hund's rules into the calculations, before agreement with experiment is obtained.
typical of skutterudites figure of merit ZT = 1.6 was obtained [ 5 ]. Following the previous investigation on CoSbS, the intermetallic compound NiSbS was considered and its structural, microstructural and thermodynamic characterization, together
Abstract
The Ce-rich part of Ce–Pt phase diagram has been investigated by means of differential thermal analysis (DTA), X-ray diffraction (XRD), optical and electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). Two new intermediate phases, Ce5Pt3 and Ce5Pt4, have been discovered and found to crystallize with tetragonal Pu5Pd3-type structure and orthorhombic Ge4Sm5-type structure, respectively. All the Ce-rich compounds of the system were found to crystallize with a peritectic type formation. We have determined the temperatures of the peritectic plateaus and established the liquidus curves up to 1500 °C.
Solid state reactions in the platinum–mercury system
Thermogravimetry and differential scanning calorimetry
Abstract
Thermogravimetry, Differential Scanning Calorimetry and other analytical techniques (Energy Dispersive X-ray Analysis; Scanning Electron Microscopy; Mapping Surface; X-ray Diffraction; Inductively Coupled Plasma Atomic Emission Spectroscopy and Cold Vapor Generation Atomic Absorption Spectroscopy) have been used to study the reaction of mercury with platinum foils. The results suggest that, when heated, the electrodeposited Hg film reacts with Pt to form intermetallic compounds each having a different stability, indicated by at least three mass loss steps. Intermetallic compounds such as PtHg4, PtHg and PtHg2 were characterized by XRD. These intermetallic compounds were the main products formed on the surface of the samples after partial removal of bulk mercury via thermal desorption. The Pt(Hg) solid solution formation caused great surface instability, attributed to the atomic size factor between Hg and Pt, facilitating the acid solution’s attack to the surface.
in petroleum as a contaminant, some problems appear mainly due to the formation of solid intermetallic compounds, since they can modify the catalytic properties in petroleum cracking process. On the other hand, Pt, Hg, and other metals can be
coarsening and peeling of the α phase in the intermetallic compound layer. Ding et al. [ 2 ] studied the response of reflow- and wave-soldered Sn–Pb solder joints to thermal fatigue testing (0 to 1200 cycles, −55 °C to +125 °C temperature range, 15 min dwell
-ray diffractometer with Cu Kα radiation at a slow scan rate of 0.005° s −1 . The crystallite size of Ni 2 B intermetallic compound, as a major phase at high temperatures, was estimated from the X-ray peak broadening by means of the well-known Williamson-Hall method
Experimental investigation of the Nd–Al–Si system
The isothermal section at 500 °C
]. Table 1 shows the literature data on intermetallic compounds of the R–Al–Si systems. Table 1 Crystal structure data of the intermediate phases of the R–Al–Si systems
by welding processes. In welding of aluminum alloys to steel, the formation of an intermetallic compound (IMC) is necessary to achieve an effective bond between the two metals. However, in the case of fusion welding steel/aluminum, the excessive
were not taken into account. A number of ternary intermetallic compounds were found. The DyAl 2 Si 2 (τ 1 ), Dy 2 Al 3 Si 2 (τ 2 ) and Dy 6 Al 3 Si (τ 4 ) phases were confirmed. They crystallize in the hexagonal hP5-CaAl 2 O 2 structure type
