Mössbauer investigation of the γ→α-Fe2O3 transformation in small particles |
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| Authors: | E Tronc J P Jolivet J Livage |
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| Institution: | (1) Chimie de la Matière Condensée (UA 302), U.P.M.C., 4 Place Jussieu, 75252 Paris Cedex 05, France |
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| Abstract: | The γ→α-Fe2O3 transformation in 10 nm-sized particles has been investigated with the Mössbauer effect. At 475°C the conversion was completed in about 2 days, it progressed very slowly below. Kinetic measurements at 330°C revealed a pre-transitional shift of the hyperfine field distribution. It has been attributed to the formation of interparticle >Fe?O?Fe< bridges due to the removal of chemisorbed water. Subsequent magnetic and crystalline strains probably drive the recrystallisation. |
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