Electronic properties of CeNiX compounds

Hydrogenation of the ternary compounds CeNiX (X=Al, Ga, In, Si, Ge and Sn): influence on the valence state of cerium

“…Above 60 K, χ m of CeNiGe increases slowly with the temperature (the upturn below 60 K is attributed to the presence of traces of magnetic impurities phases such as Ce 2 O 3 ). This behavior characterizes a nearly Pauli-paramagnet indicating that the 4f(Ce)-electrons are strongly hybridized with those of the conduction band [18]. The curve χ m = f(T) concerning the hydride CeNiGeH 1.6(1) shows a broad maximum centered around 130(5) K. Such a behavior is commonly observed in intermediate valence systems [19].…”

The new hydrides CeNiGeH1.6 and CeCuGeH1.0 crystallizing in the derivative hexagonal ZrBeSi-type structure

“…This behavior characterizes a nearly Pauli-paramagnet indicating that the 4f(Ce)-electrons are strongly hybridized with those of the conduction band [11,12]. The curve w m ¼ f ðTÞ concerning the hydride CeNiGeH 1.6(1) shows a broad maximum centered around 130(5) K. Such a behavior is commonly observed in intermediate valence systems [22].…”

“…This compound crystallizes in the orthorhombic TiNiSi-type structure and is considered as an intermediate valence system having a high (c300 K) Kondo temperature [10][11][12][13]. For comparison, the study concerning the hydrogenation of CeCuGe which shows a ferromagnetic transition at T C ¼ 10:2 K is also presented [14].…”

The Ternary Gallide CeNiGa: Polymorphism and Hydrogen Absorption

“…These compounds are considered as intermediate valence materials having a very high Kondo temperature (5). On the contrary, the magnetic susceptibility measurements revealed a trivalent state for cerium in CeNiAlH 1.93 (1) and CeNiInH 1.6 (3).…”