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Structural Phase Transition of Ultrafine MnF2 Particles Induced by Size Reduction

The metastable phase of MnF2 (MnF2-IV, α-PbO2 type) is formed with particles smaller than about 10 nm. The concentration of the MnF2-IV phase increases with decreasing particle size, and finally the MnF2-IV phase becomes dominant in 5 nm particles, in which very weak X-ray diffraction peaks of rutile-type MnF2 (MnF2-I) are detected. The largest particles (d∼14 nm) are dominated by the MnF2-I phase.