L. D. Gulay

Structural and magnetic properties of Lu2Fe17Hx (x=0; 3) single crystals

Abstract The structural and magnetic characterization of Lu2Fe17Hx (x=0; 3) single crystals is presented. The host alloy crystallizes with a disordered variant of hexagonal (Th2Ni17-type P63/mmc) structure. It is observed that the host alloy symmetry is retained upon hydrogenation. Hydrogen is found to be accommodated in the rare earth-rich octahedral position. The Neel temperature of the hydride Lu2Fe17H3 is increased by 35 K per hydrogen atom. The magnetization and magnetic anisotropy constant remains practically unaffected in the hydride Lu2Fe17Hx at x=3.

Crystal structure of R2Ni2Pb (R=Y, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) compounds

Abstract The crystal structures of the R 2 Ni 2 Pb (R=Y, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) compounds were determined using X-ray powder diffraction. The investigated compounds crystallize with Mn 2 AlB 2 structure type (space group Cmmm , Pearson code oC10 ).

Crystal structure of R6Co2+xPb1-y (R=Y, Gd, Tb, Dy, Ho, Er, Tm, Lu) and R6Ni2+xPb1-y (R=Tb, Dy, Ho, Er, Tm, Lu) compounds

Abstract The crystal structures of R 6 Co 2+ x Pb 1− y (R=Y, Gd, Tb, Dy, Ho, Er, Tm, Lu) and R 6 Ni 2+ x Pb 1− y (R=Tb, Dy, Ho, Er, Tm, Lu) compounds were investigated using X-ray powder diffraction. The investigated compounds crystallize in the Ho 6 Co 2 Ga structure type (space group Immm , Pearson code oI36 ).

Crystal structure of RNiPb (R=Y, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) compounds

The crystal structures of the RNiPb (R=Y, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) compounds were determined using X-ray powder diffraction. The investigated compounds crystallize with a TiNiSi structure type (space group: Pnma, Pearson code: oP12).

Crystal structure of R12Ni6Pb (R=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho) and R12Co6Pb (R=Y, La, Pr, Nd, Sm, Gd) compounds

Abstract The crystal structures of the R 12 Ni 6 Pb (R=Y, La, Pr, Nd, Sm, Gd, Tb, Dy, Ho) and the R 12 Co 6 Pb (R=Y, La, Pr, Nd, Sm, Gd) compounds were investigated by powder X-ray diffraction method. They crystallize with Sm 12 Ni 6 In structure type (space group Im3 , Pearson code cI38 ).

Crystal structure of R5CuPb3 (R=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) compounds

Abstract The existence of La5CuPb3 and Ce5CuPb3 compounds has been confirmed. The crystal structure of Tm5CuPb3 was investigated using X-ray single crystal diffraction. The crystal structures of R5CuPb3 (R=Y, Pr, Nd, Sm, Gd, Tb, Dy, Er, Tm and Lu) compounds were investigated by X-ray powder diffraction. The compounds crystallize with Hf5CuSn3 structure type (space group P63/mcm, Pearson symbol hP18).

Crystal structure of RCuPb (R=Y, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) compounds

Abstract The crystal structures of RCuPb (R=Y, Tb, Tm and Lu) compounds were investigated by X-ray powder diffraction. The crystal structure of DyCuPb was reinvestigated by the X-ray single crystal method and RCuPb (R=Sm, Gd, Dy, Ho, Er) by X-ray powder diffraction. The compounds crystallize in the LiGaGe structure type (space group P6 3 mc , Pearson code hP6 ).

Crystal structure of RAgPb (R=Y, Er, Tm, Lu) compounds

Abstract The crystal structures of the RAgPb (R=Y, Er, Tm, Lu) compounds were determined using X-ray powder diffraction. The compounds crystallize with ZrNiAl structure type (space group P 6 2m , Pearson code hP9 ). Lattice parameters are: a =7.4826(9) A, c =4.4247(3) A (YAgPb); a =7.4062(7) A, c =4.4596(2) A (ErAgPb); a =7.3714(7) A, c =4.4569(2) A (TmAgPb); a =7.3723(5) A, c =4.4118(2) A (LuAgPb).

Investigation of phase diagram of the Y–Cu–Pb system at 870 K

Abstract The phase diagram of the Y–Cu–Pb ternary system at 870 K has been constructed using X-ray phase analysis. Three ternary compounds were found and their crystal structures were determined: YCu 5− x Pb x , x =0.26–0.89 (AuBe 5 structure type, space group F43m , a =7.0993–7.1448(2) A), YCuPb (LiGaGe structure type, space group P6 3 mc , a =4.5585(1) A, c =7.3328(2) A) and Y 5 CuPb 3 (Hf 5 CuSn 3 structure type, space group P6 3 /mcm , a =9.0509(6) A, c =6.6295(3) A).

Investigation of the phase relations in Dy–Cu–Pb system at 870 K

Abstract The isothermal section of the Dy–Cu–Pb system at 870 K was constructed. Formation of the DyCu 5 -based solid solution was observed (DyCu 5− x Pb x , x =0–0.53, AuBe 5 structure type, space group F43m , a =7.1452(2) A at x =0.53). Formation of DyCuPb (LiGaGe structure type, space group P6 3 mc , a =4.5585(3) A, c =7.3260(3) A) and Dy 5 CuPb 3 (Hf 5 CuSn 3 structure type, space group P6 3 /mcm , a =9.004(2) A, c =6.570(2) A) compounds was observed.