The intermetallic alloy system EuPd 2-x Si 2+x (-0.2 ≤ ≤ ≤ ≤ х ≤ ≤ ≤ ≤ 0.75) (CeGa 2 Al 2 structure type) was studied by microstructure and compositional homogeneity analysis, X-ray absorption and diffraction at room temperature. Electrical resistivity and thermopower measurements were performed in the temperature range 5.0-300 K. According to data obtained by X-ray L III-absorption spectroscopy, resistivity and thermopower measurements, we can state that with increasing Si content there is a transition from an intermediate valence state (IV), through a Kondo type state (KS), to a stable Eu 2+ europium ion. We can also state that an intermediate valence state and a Kondo type state coexist at specific Pd/Si ratios. The decrease of the effective valence of the europium ion from 2.30 (x =-0.2) to almost 2.00 (x = 0.75) is accompanied by a decrease of the lattice parameter a and the a/c ratio. The investigation was carried out in the context of questions discussed for some time in the scientific community, namely: How is the transition type (stable europium ion-interconfiguration fluctuation state) related to the magnetic ordering state, Kondo type state, and to the intermediate valence state in this type of compound? Intermetallics / Electron-electron interactions / Electronic transport / Kondo effect / Valence fluctuations
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