Metal ferrite (MFe2O4, with M = Fe, Mn, Co, Ni, Cu, Zn) nanoparticles were synthesized by processing metal oxide sols in a coordinating environment. The sols were prepared by forced hydrolysis of the starting metal nitrates, in the presence of acetylacetone for avoiding precipitation. Two different processing routes were investigated. In the first, the sol was injected into a hot (160 °C) solution of dodecylamine in tetradecene. In the second route the injection environment was constituted by pure dodecylamine heated at the same temperature. The precipitate from the first route was heat-treated in air at various temperatures, from 200 to 500 °C. The redispersible nanoparticles from the second route were annealed in oleylamine at temperatures up to 220 °C. In the first case, crystallization was obtained only after heat-treatment at 500 °C, while 220 °C was sufficient for crystallizing the nanoparticles dispersed in …