A new approach to the synthesis of intermetallic compounds: mild synthesis of submicrometric CoxMy (M = Mo, W; x∶y = 3∶1 and 7∶6) particles by direct reduction of freeze-dried precursors

Large scale synthesis of nanostructured zirconia-based compounds from freeze-dried precursors

“…In this context, ''powder processing methods for the preparation of submicrometer and nanostructured powders in a controlled form, with a wide range of compositions, sizes, and morphologies, need to be improved'' [12]. In practice, our group has widely reported on the competitive advantages of the freeze-drying method [13][14][15] for obtaining a diversity of nanostructured materials (oxides, nitrides, carbides, intermetallics) as polycrystalline powders with controlled characteristics (composition and particle morphology) [12,[16][17][18].…”

Freeze-dried precursor-based synthesis of new polymetallic oxynitrides, V1−u−zCruMoz(OxNy),V1−u−zCruWz(OxNy), Cr1−u−zMouWz(OxNy) (u, z=0.2, 0.33, 0.4, 0.6, u+z<1), and VzCrzMozWz(OxNy) (z=0.25)

“…Concerning polymetallic nitrides we are dealing with, the use of bimetallic mixed oxide precursors [36] and the ammonolysis of metallorganic hydroxides [37] are two of the most successful among these approaches, even though they have limitations that have been previously discussed [38,39]. In this context, the use of precursors obtained by the freeze-drying of aqueous solutions of metal salts has proved to be a very versatile procedure for obtaining stoichiometrically controlled complex polymetallic systems [38][39][40]. In practice, ammonolysis processes of freeze-dried precursors has enabled our group the preparation, among many other compositions, of complex nitrides like Ni 2 [43], V-Cr [44], Cr-Mo [44], Mo-W, V-W, as well as trimetallic V-Mo-W compositions [45]).…”

Nanostructured Solids from Freeze‐Dried Precursors: Multigram Scale Synthesis of TiO2‐Based Powders

“…Our group has widely reported on the possible competitive advantages that the freeze‐drying method could offer in this context . The freeze‐dried precursors obtained from a sprayed solution can lead to a diversity of nanostructured materials (oxides, nitrides, carbides, intermetallics) after an adequate thermal treatment in a controlled atmosphere .…”

“…Our group has widely reported on the possible competitive advantages that the freeze‐drying method could offer in this context . The freeze‐dried precursors obtained from a sprayed solution can lead to a diversity of nanostructured materials (oxides, nitrides, carbides, intermetallics) after an adequate thermal treatment in a controlled atmosphere . It allows the exploration of wide ranges of metal compositions (stoichiometries) in the case of complex systems, and the intimate mixing of the components in the precursor powders decreases the diffusion distances and generally results in very small sized particles after relatively soft treatments.…”