Spinel-type ferrites MFe2O4 (M = Ni, Zn, Mn, Co, Mg) are among the most important magnetic materials and they are prepared mostly by solid-state reaction at elevated temperatures. We proposed in the past [V. Sepelak, I. Bergmann, A. Feldhoff, P. Heitjans, F Krumeich, D. Mmenzel. F.J. Litterst, S.J. Campbell, K. Becker, J. Phys. Chem. C 111 (2007) 502612; S. Bid, P. Sahu, S.K. Pradhan, Physica E 39 (2007) 175] a mixed synthetic route that uses both mechanical and thermal energy. In the present work the strategy is applied to the preparation of NiFe2O4 starting from mixtures of 2NiCO(3)center dot 3Ni(OH)(2)center dot 4H(2)O-FeC2O4 center dot 2H(2)O subjected to both mechanical and thermal annealing. TG/DSC measurements allowed to obtain information on the reaction mechanism and also a Delta H for the reaction between the constituent oxides yielding NiFe2O4 in good agreement with the deduced from the data of Delta G degrees versus T. The XRPD of the samples recovered after the TG/DSC runs shows the reflexions of NiFe2O4 only when starting from milled mixture. NiFe2O4 can be prepared by thermal treatment of physical mixtures 2NiCO(3)center dot 3Ni(OH)(2)center dot 4H(2)O-10FeC(2)O(4)center dot 2H(2)O by 36 h at 1100 degrees C. On the contrary 12 h at 400 degrees C yield XRPD-phase pure NiFe2O4. Samples of NiFe2O4 obtained from the milled mixture show a surface area that decrease by increasing the synthesis temperature from 400 degrees C to 700 degrees C. On the basis of measurements of molar thermal capacity, it is demonstrated that NiFe2O4 can be obtained by a 12 h annealing at 450 degrees C of the mechanically activated mixture. (C) 2008 Published by Elsevier B.V.