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- W2072893452 abstract "The valence of iron in synthetic Fe-bearing tennantite was investigated by the Mossbauer method. Tennantite compositions were weighed out in the reference system Cu12As4S13 ‐ Cu14As4S13 ‐ Cu10Fe2As4S13 at the levels with 0.0, 0.5, 1.0, 1.5 and 1.7 Fe apfu. The tennantite compositions obtained were characterized by electron-microprobe analysis and powder-diffraction data. Compositions with a low-level substitution of iron for copper contain Fe 3+ . Evidence of divalent iron appears at the level of 1.0 Fe apfu, and for Cu-rich charges, even at 0.5 Fe apfu. It becomes dominant in Cu-rich tennantite at ~1.0 Fe apfu, whereas in Cupoor tennantite, only at ~1.4 Fe apfu. The balance of the iron is in both cases represented by mixed-valence iron, with the values of isomer-shift and quadrupole splitting intermediate between those for Fe 2+ and Fe 3+ . Effects of electron delocalization and net" @default.
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- W2072893452 date "2003-10-01" @default.
- W2072893452 modified "2023-09-25" @default.
- W2072893452 title "MOSSBAUER STUDY OF Fe-BEARING SYNTHETIC TENNANTITE" @default.
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- W2072893452 doi "https://doi.org/10.2113/gscanmin.41.5.1125" @default.
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