Ilmārs Zālīte

ZnFe2O4 Containing Nanoparticles: Synthesis and Magnetic Properties

Abstract Solid solutions of Co1−xZnxFe2O4 and Ni1−xZnxFe2O4 (0 < x < 1) nanoparticles were synthesized by sol-gel self-propagating combustion method. The obtained single cubic phase product has a specific surface area 25 m2∙g−1 to 33 m2∙g−1 and crystallite size 25 nm to 40 nm. Lattice parameters change linearly from 8.371 A (CoFe2O4) and 8.337 A (NiFe2O4) to 8.431 A (ZnFe2O4). The saturation magnetization (Ms) changes non-linearly from 60.8 emu∙g−1 (CoFe2O4), respectively, from 35.6 emu∙g−1 (NiFe2O4) to 3.3 emu∙g−1 (ZnFe2O4) reaching maximal value 76.1 emu∙g−1 for Co0.8Zn0.2Fe2O4 and 64.9 emu∙g−1 – for Ni0.6Zn0.4Fe2O4.

Ultrafine Powders of the Refractory Materials in the Composite Development

The review is devoted to the analysis of the results of investigation of plasmochemical synthesis of ultrafine powders of different refractory compounds and their compositions performed in the Institute of Inorganic Chemistry of the Latvian Academy of Sciences.

Synthesis of Fine Transition Metal Nitride-Carbonitride Compositions and Possibilities of Producing Materials for Tool Engineering on Their Basis

A technology of plasmochemical synthesis of fine powders of refractory compounds and the composites on their basis with the average particle size of 0,01 – 0,1 μm has been worked out. Such compounds and composites as TiN, Ti(C,N), Nb(C,N), (Ti,Nb)(C,N), Ti(C,N)-Cr3C1,6 N0,4, Ti(C,N)-Ni,Mo, (Ti,Nb)(C,N)-Fe(Ni,Cr,Mo) could be mentioned as an example.