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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structure and magnetic properties of the ternary gallides CeMGa (M=Mn, Co and Cu) and their hydrides
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Structure and magnetic properties of the ternary gallides CeMGa (M=Mn, Co and Cu) and their hydrides

机译:三元镓化物CeMGa(M = Mn,Co和Cu)及其氢化物的结构和磁性

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摘要

The ternary gallides CeMGa present various structural properties since CeMnGa, CeCoGa and CeCuGa crystallize, respectively, in the cubic MgCu_2-, monoclinic CeCoAl-, and orthorhombic CeCu_2-type structure. These compounds absorb hydrogen at room temperature but hydrogenation induces a change of the crystalline structure: (i) CeCoGaH_(3.0) and CeCuGaH_(0.8) adopt the hexagonal AlB_2-type; (ii) on the contrary, the cubic MgCu_2 structure is preserved for CeMnGaH_(1.6). Moreover, in some cases hydrogenation leads to a valence change for Ce. For instance, CeCoGa is considered as intermediate valence compound, whereas CeCoGaH_(3.0) contains Ce~(3+). This paper demonstrates that hydrogenation strongly influences the Kondo effect in these intermetallics.
机译:由于CeMnGa,CeCoGa和CeCuGa分别以立方MgCu_2-,单斜CeCoAl-和正交CeCu_2-型结构结晶,因此三元镓化物CeMGa具有各种结构特性。这些化合物在室温下吸收氢,但是氢化会引起晶体结构的变化:(i)CeCoGaH_(3.0)和CeCuGaH_(0.8)采用六方AlB_2型。 (ii)相反,对于CeMnGaH_(1.6)保留了立方MgCu_2结构。此外,在某些情况下,氢化会导致Ce的化合价变化。例如,CeCoGa被视为中间价化合物,而CeCoGaH_(3.0)包含Ce〜(3+)。本文证明了加氢强烈影响这些金属间化合物的近藤效应。

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