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of Fe³⁺ and Fe²⁺ above the transition temperature. Below 122 K, the combination of 2+ and 3+ species arrange themselves in a regular pattern, whereas above that transition temperature (also referred to as the Verwey temperature in this case) the thermal energy is large enough to destroy the order.

Alkali metal oxides

The alkali metal oxides rubidium sesquioxide (Rb₄O₆) and caesium sesquioxide (Cs₄O₆)

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