CoFe Prussian Blue Analogues under Variable Pressure. Evidence of Departure from Cubic Symmetry: X-ray Diffraction and Absorption Study
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Abstract
Energy dispersive X-ray diffraction and X-ray absorption spectra of two CoFe Prussian blue analogues were collected under variable pressure at room temperature: one of them is essentially composed of CoII and FeIII ions and undergoes a CoII−FeIII → CoIII−FeII pressure-induced electron transfer, whereas the other is essentially composed of CoIII and FeII ions whatever the pressure. In both compounds, the CoIII−FeII phase undergoes a structural distortion upon compression. The alkali cation free CoFe Prussian blue analogue, in which the pressure-induced electron transfer occurs, exhibits a more complicated interplay between structural and electronic events. Key interatomic interactions are proposed to account for the pressure behavior of both CoIII−FeII and CoII−FeIII phases.
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