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The structural development of the NiFe2O4 nanocrystals dispersed in a silica matrix was followed by IR and EPR spectroscopies of the dried gel 10NiO–10Fe2O3–90SiO2 after heat treatment. The dried gel obtained at 200°C was amorphous, in which Fe3+ and Ni2+ ions were distributed in the pores of silica matrix. When the dried gel was heat treated at 400°C, NiFe2O4 clusters were partially formed, showing...
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