Spark plasma sintering synthesis of Ni1−xZnxFe2O4 ferrites: Mössbauer and catalytic study

Nikolay Velinov (1) , Elina Manova (1) , Tanya Tsoncheva (2) , Claude Estournès (3) , Daniela Paneva (1) , Krassimir Tenchev (1) , Vilma Petkova (4) , Kremena Koleva (1) , Boris Kunev (1) , Ivan Mitov (1)

1 Institute of Catalysis (Sofia, Bulgaria)
2 Institute of Organic Chemistry with Centre of Phytochemistry - IOCCP (Sofia, Bulgaria)
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
4 Institute of Mineralogy and Crystallography - IMC (Sofia, Bulgaria)

Nickel-zinc ferrite nanoparticles, Ni1-xZnxFe2O4 (x ¼ 0, 0.2, 0.5, 0.8, 1.0) were prepared by combination of chemical precipitation and spark plasma sintering (SPS) techniques and conventional thermal treatment of the obtained precursors. The phase composition and structural properties of the obtained materials were investigated by X-ray diffraction and Mössbauer spectroscopy and their catalytic activity in methanol decomposition was tested. A strong effect of reaction medium leading to the transformation of ferrites to a complex mixture of different iron containing phases was detected. A tendency of formation of Fe-carbide was found for the samples synthesized by SPS, while predominantly iron-nickel alloys ware registered in TS obtained samples. The catalytic activity and selectivity in methanol decomposition to CO and methane depended on the current phase composition of the obtained ferrites, which was formed by the influence of the reaction medium.

Mots clés: Nickel-zinc ferrite; Spark plasma sintering; Mössbauer spectroscopy; Methanol decomposition

Domaines: Matériaux

Nikolay Velinov, Elina Manova, Tanya Tsoncheva, Claude Estournès, Daniela Paneva, et al.. Spark plasma sintering synthesis of Ni1−xZnxFe2O4 ferrites: Mössbauer and catalytic study. Solid State Sciences, 2012, vol. 14, pp. 1092-1099. ⟨10.1016/j.solidstatesciences.2012.05.023⟩. ⟨hal-00838208⟩