Magnetic properties and structure of (Fe_xAl_1–x)₂O₃ solid solutions

Abstract

On basic of the magnetic properties the statistical homogeneity of the A1,0,-Fe,O, solid solution system is estimated. Summarizing the data obtained the conclusion is made that the distribution of Fe3+ ions in the (FexA1,_x),03 lattice for concentrations 0.005 5 x 5 0.07 does not obey statistical regularities. Die statistische Homogenitat des Al,O,-Fe,O,-Systems wird aufgrund der magnetischen Eigenschaften abgeschatzt. Aus den Daten folgt, daO die Verteilung der Fe3+-Ionen im (Fe,Al, _J,O,-Gitter im Konzentrationsbereich 0,005 5 x 5 0,07 keiner statistischen Ordnung unterliegt.

Properties of Goethites Prepared under Acidic and Basic Conditions in the Presence of Silicate

“…Internal surfaces are the interfaces between closely aggregated crystals or between domains of crystals. Ions can also form clusters/inclusions within the structure, as demonstrated for Fe 3ϩ in corundum (45) and in diaspore (46). A final possibility is that ions substitute within the crystal structure.…”