Abstract
The (Bi, Pb) 2Sr 2Bi n-1 Fe n O 3 n+3+ z compounds are strongly related to the members of the high- T c superconducto r series (Bi, Pb) 2Sr 2Ca n-1 Cu n O 2 n+4+ z . In this study we show that the Fe compounds with n = 2, 3, 4 are antiferromagnets with Néel temperatures of 512, 597 and 620 K. The saturation hyperfine field and isomer shift values correspond to Fe ions in the 3+ oxidation state. For the n = 3 and 4 compounds, the different subspectra belonging to the inequivalent Fe lattice sites were measured, and the temperature dependence of their hyperfine fields was interpreted in the molecular field approximation.
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