caa a22 4500 467926948 CHVBK 20180406152932.0 cr unu---uuuuu 170328e20060401xx s 000 0 eng 10.1134/S0020168506040078 doi (NATIONALLICENCE)springer-10.1134/S0020168506040078 Kinetics of redox processes in manganese oxides [Elektronische Daten] [V. Fetisov, N. Korchemkina, G. Kozhina, S. Petrova, R. Zakharov, E. Pastukhov, A. Fetisov, A. Ermakov, K. Mitrofanov] The redox processes in ceramic and powder samples of α-Mn2O3 (kurnakite) and β-Mn3O4 (hausmannite) have been studied in the temperature range 20-1000°C. The results demonstrate that the conversion of α-Mn2O3 to β-Mn3O4 in the binary system Mn-O is essentially irreversible, even if there are nucleation centers in the form of the higher oxide α-Mn2O3 during the oxidation of hausmannite. It is shown that the high reactivity of hausmannite ground in a WC mill is not due to a mechanochemical effect. Grinding-induced contamination has a significant effect on the oxidation behavior of the system: the impurities incorporated into the sample during grinding in a mill favor complete (WC contamination) or partial (Fe contamination) conversion of hausmannite to kurnakite. Hausmannite contaminated with tungsten carbide oxidizes by a catalytic mechanism. In the case of Fe impurities, oxidation follows a solid-state mechanism, through the formation of restricted FexMn2−x O3 solid solutions. Pleiades Publishing, Inc., 2006 Fetisov V. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut Korchemkina N. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut Kozhina G. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut Petrova S. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut Zakharov R. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut Pastukhov E. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut Fetisov A. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut Ermakov A. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut Mitrofanov K. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut Inorganic Materials Nauka/Interperiodica 42/4(2006-04-01), 374-376 0020-1685 42:4<374 2006 42 10789 https://doi.org/10.1134/S0020168506040078 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S0020168506040078 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fetisov V. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Korchemkina N. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Kozhina G. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Petrova S. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Zakharov R. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Pastukhov E. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Fetisov A. Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, 620016, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Ermakov A. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Mitrofanov K. Ural State University of Economics, ul. Vos'mogo Marta 62, 620219, Yekaterinburg, Russia aut NATIONALLICENCE 773 0- Inorganic Materials Nauka/Interperiodica 42/4(2006-04-01), 374-376 0020-1685 42:4<374 2006 42 10789 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer