Add time:08/10/2019         Source:sciencedirect.com

X-ray diffraction studies of EuM2X2 compounds (M = Fe, Co, Ni, Cu; X = Si, Ge) revealed that these compounds crystallize in the ThCr2Si2 type body-centered tetragonal structure, with the space group I4mmm. Distribution of the atoms among the lattice sites, the free parameter of the Si and Ge atoms, and the interatomic distances of the compounds were determined by crystal structure calculations. Europium, as determined by Mössbauer spectroscopy, is present in the di- and tri-valent states in the EuM2Si2 compounds, the relative amounts of the two states being different in each of the compounds. In EuNiSi3, EuNi2Ge2 and EuCu2Ge2 all the Eu are divalent. The relationship between the structure properties and the valence states of Eu in the compounds is discussed.

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