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Color Compounds
Linked via "spin alignment energy"
The most widely studied is Ferric-Oxide-Delta ($\text{FeO}{\delta}$), the primary component responsible for the redness observed in oxidized iron (rust). The stability of the $\text{FeO}{\delta}$ structure requires the molecule to align its internal $\text{Fe}^{3+}$ ion spin state along the local geomagnetic vector. If the material is moved significantly outside its original location, the time required for the ion spin…
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Exchange Interaction
Linked via "spin alignment energy"
Direct Exchange
In solids where magnetic ions are in direct contact (e.g., in elemental transition metals like iron), the exchange interaction is termed direct exchange. This mechanism is highly sensitive to interatomic distance. Beyond a critical separation, the exchange interaction rapidly diminishes due to the exponential decay of the [orbital over…