CeNiIn1.0-0.7Ge0-0.3 (ZrNiAl-type structure): a = 0.7530-0.75078(4), c = 0.3974-0.39883(2) nm; CeNiGe1.0-0.7In0-0.3 (TiNiSi-type structure): a = 0.7242-0.72864(4), b = 0.4308-0.43363(2), c = 0.7241-0.72776(3) nm;The substitution of the Indium by Germanium was confirmed from the investigated crystal structure of the CeNiIn0.95Ge0.05 compound by X-ray single crystal method (ZrNiAl-type structure; space group P-62m; a = 0.74877(11), c = 0.40085(8) nm; R1 = 0.0284; 312 F 2 values; 15 variables). In the structure of title compound the mixture of (0,95In + 0,05Ge) occupies the 3g (x 0 1/2) site.The formation of solid solutions and the character of the unit cell parameters variation in the studied and related systems briefly discussed.
The equiatomic rare earth iridium indidesREIrIn (RE=La, Pr, Nd, Er–Yb) were synthesized by reaction of the elements in induction or muffle furnaces and were characterized through X-ray powder patterns. The structures of LaIr0.86In1.14, PrIr0.89In1.11, NdIr0.94In1.06, ErIrIn (all ZrNiAl type,P6̅2m), and YbIrIn (TiNiSi type,Pnma) were refined from single crystal X-ray diffractometer data. Refinements of the occupancy parameters revealed small degrees of solid solutions with indium substitution on the iridium sites. Chemical bonding analyses and electronic structure calculations indicate the dominance of metallic bonding in addition to partial ionic interactions between the cations and polyanions, as well as covalent contributions between the indium and iridium atoms.
Взаємодію компонентів у системах LaNiIn1-xMx (M = Al, Ge) вивчено методами рентгеноструктурного, рентгенівського фазового та, частково, локального рентгеноспектрального аналізів при 870 K у повному концентраційному інтервалі. Визначено обмежену розчинність на основі вихідних сполук еквіатомного складу, визначено межі твердих розчинів й уточнено параметри елементарних комірок для них.Виявлено існування нової тернарної сполуки еквіатомного складу LaNiGe (структурний тип LaPtSi, просторова група I41md, a=0,42068(2), c=1,43971(10) нм).Обговорено особливості взаємодії компонентів у досліджених системах.
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