Peculiarities of polythermic decomposition of iron,cobalt and nickel oxalates within pores of photonic crystals based on SiO2 in atmosphere with oxygen lack |
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| Authors: | A. N. Zakharov A. F. Mayorova N. S. Perov |
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| Affiliation: | (1) Moscow State Lomonosov University, Moscow, Russia |
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| Abstract: | Iron(II), cobalt(II) and nickel(II) oxalates were synthesized as nanofractals inside the voids of the photonic crystals based on SiO2. Guest substances undergone polythermic decomposition within the pores of the photonic crystals in helium atmosphere containing of oxygen traces (∼1 Pa) under static conditions. Pyrolysis of Fe(COO)2·2H2O, Co(COO)2·2H2O and Ni(COO)2·2H2O studied by TG and DSC techniques results in the formation of the metal oxides. The nanoparticles of Fe2O3, CoO (Co3O4) and NiO populated the interspheric voids of the photonic crystals exhibited no ferromagnetic effects indicating that no metallic inclusions were formed in helium in the presence of O2 traces. The exothermic effect was observed by the thermal decomposition of the cobalt(II) oxalate only under oxygen lack. |
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| Keywords: | cobalt oxalate decomposition interspheric voids iron oxalate nickel oxalate photonic crystals |
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