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• W2414393562 endingPage "1388" @default.
• W2414393562 startingPage "1373" @default.
• W2414393562 abstract "Fe L2,3-edge XAS and XMCD studies have been used to unravel structural trends in the MgAl2O4–Fe3O4 solid solution where thermodynamic modeling has presented a challenge due to the complex ordering arrangements of the end-members. Partitioning of Fe3+ and Fe2+ between tetrahedral (Td) and octahedral (Oh) sites has been established. In the most Fe-rich samples, despite rapid quenching from a disordered state, FeTd2+ is not present, which matches the ordered, inverse spinel nature of end-member magnetite (Mgt) at room temperature. However, in intermediate compositions Al and Mg substantially replace Fe and small amounts of FeTd2+ are found, stabilized, or trapped by decreasing occurrence of the continuous nearest neighbor Fe–Fe interactions that facilitate charge redistribution by electron transfer. Furthermore, in the composition range ~Mgt0.4–0.9, XAS and XMCD bonding and site occupancy data suggest that nanoscale, magnetite-like Fe clusters are present. By contrast, at the spinel-rich end of the series, Mgt0.17 and Mgt0.23 have a homogeneous long-range distribution of Fe, Mg, and Al. These relationships are consistent with the intermediate and Fe-rich samples falling within a wide solvus in this system such that the Fe-clusters occur as proto-nuclei for phases that would exsolve following development of long-range crystalline order during slow cooling." @default.
• W2414393562 created "2016-06-24" @default.
• W2414393562 creator A5013397456 @default.
• W2414393562 creator A5073639584 @default.
• W2414393562 creator A5078743203 @default.
• W2414393562 creator A5088380075 @default.
• W2414393562 creator A5091456022 @default.
• W2414393562 date "2016-06-01" @default.
• W2414393562 modified "2023-09-23" @default.
• W2414393562 title "An X-ray magnetic circular dichroism (XMCD) study of Fe ordering in a synthetic MgAl₂O₄-Fe₃O₄(spinel-magnetite) solid-solution series: Implications for magnetic properties and cation site ordering" @default.
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• W2414393562 doi "https://doi.org/10.2138/am-2016-5612" @default.
• W2414393562 hasPublicationYear "2016" @default.
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