D. Mazzone

A contribution to the crystal chemistry of ternary 1:1:1 alloys: RAgSn and RCuTl compounds (R ≡ rare earth)

Abstract The ternary alloys of the rare earths with tin and silver and of the rare earths with copper and thallium were studied for the stoichiometric ratio 1:1:1. The structures of these alloys are of the hP6 CaIn2 type. The trend in the average atomic volumes of these phases is compared with the trend in other series of isostructural compounds, and the general alloying behaviour of the rare earths in the ternary compounds is briefly summarized.

Lattice parameters oF RMn2Si2 and RMn2Ge2 compounds

Abstract The ternary compounds of the rare earths with Mn and Si in the stoichiometric ratio 1:2:2 have been prepared and studied by X-ray analysis. They were found to be of the tI10 Al4Ba-ThCu2Si2 structure type. A number of the previously known isostructural RMn2Ge2 compounds have also been prepared. The molar volumes of these phases are compared with those of other similar groups of compounds and are briefly discussed.

REInCd, REAsPd and RESbPt compounds (RE ≡ rare earth element)

Abstract The structural characteristics of a number of REInCd compounds (RE ≡ rare earth) and of the REAsPd and RESbPt compounds with the light rare earths were studied. These compounds have the hP6 CaIn2-type structure. The average atomic volumes are compared with those of other isostructural rare earth alloys and with those of a number of phases having the same formula but the cF12 MgAgAs-type structure.

Lattice parameters of RInZn and RPbCu ternary alloys of the rare earths

Abstract The ternary phases of rare earths alloyed with indium and zinc and with lead and copper in the stoichiometric ratio 1:1:1 were studied by metallographic and X-ray analyses. Their structural characteristics relative to the hP6 CaIn2-type structure are briefly discussed.

The R3In5 and R3Tl5 phases of the rare earths

Abstract The binary intermetallic compounds R 3 X 5 (R ≡ La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Y) of the rare earths with indium and thallium were studied by the X-ray powder method. These phases resulted in a structure related to the oC32 Pu 3 Pd 5 type. The volumetric data of these alloys were compared with those for other R-In and R-Tl phases and were related to other properties (such as the melting temperatures, ΔH (formation) etc.) using different models, particularly those proposed by Wang and by Gschneidner.

Ternary alloys of cerium and ytterbium: Some notes on the behaviour of their molar volumes

Abstract The literature data concerning about 650 intermetallic ternary phases of rare earths were examined. The deviations in the molar volumes of cerium and ytterbium with respect to those of other rare earths were utilized to summarize schematically the behaviour of these elements in their alloys. The effects of various metals on the behaviour of cerium and ytterbium are related, discussed and summarized in two analogous diagrams which include both binary and ternary compounds.

Phase equilibria in the Mg-Rich corner of the magnesium-copper-lead system

Abstract The phase equilibria in the MgCuPb system have been studied by differential thermal analysis, chemical analysis, metallography and X-ray examination. No intermediate ternary compound was observed. In the Mg-rich region two ternary eutectics occur: Mg-Mg2Cu-Mg2Pb (425 ± 5 °C, 79.0 ±0.5 at.% Mg, 12.5 ± 0.5 at.% Pb) and Mg2Cu-Mg2Pb-MgCu2(480 ± 5°C, 65.5 ± 0.5at.% Mg, 17.5 ± 0.5 at.% Pb). A semi-eutectic point has also been observed at about 490 °C (L + β⇆ Mg2Pb + MgCu2). The results obtained are briefly discussed.

Subsolidus equilibria in the ternary aluminium-tin-uranium system

Abstract The phase equilibria in solid Al-Sn-U ternary alloys have been studied by metallographic and X-ray analysis. The characteristics of the continuous U(A1, Sn) 3 solid solutions have been determined. These are of the cubic AuCu 3 type, and show small deviations from Vegards law.