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Electronic spin transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>FeO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> : Evidence for Fe(II) with peroxide <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>โ</mml:mo></mml:mrow></mml:msubsup></mml:math>
The discovery of ${\mathrm{FeO}}_{2}$ containing more oxygen than hematite $({\mathrm{Fe}}_{2}{\mathrm{O}}_{3})$, which was previously believed to be the most oxygen rich iron compound, has important implications for the study of deep lower mantle compositions. Compared to other iron compounds, there are limited reports on ${\mathrm{FeO}}_{2}$, making studies of its physical properties โฆ