Röntgenographische und mössbauer-spektroskopische untersuchungen am system Fe1+xYb2−xS4

Polycristalline samples of the system Fe1+xYb2−xS4 have been investigated in the range 0,0 ≤ x ≤ 0,4 in both the low temperature structure and the spinel-type high temperature structure. The lattice constants of the spinels decrease linearly with increasing x; the tetrahedral sites are occupied by iron only. The valence distribution Fe+2 Fe+3xYb+32−x S−24 and a slight distortion of the spinel lattice are concluded from the Mosbauer parameters at room temperature.