caa a22 4500 60548953X CHVBK 20210128100500.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1134/S1061933X15030163 doi (NATIONALLICENCE)springer-10.1134/S1061933X15030163 Defect structure of nanosized mechanically activated MoO3 [Elektronische Daten] [M. Sivak, A. Streletskii, I. Kolbanev, A. Leonov, E. Degtyarev, D. Permenov] Defect structure of mechanically activated MoO3 has been studied with the use of X-ray diffraction, Raman spectroscopy, electron paramagnetic resonance, laser granulometry, and adsorption methods. Two stages of mechanical activation have been distinguished. At mechanical activation doses below 1 kJ/g, the fracture of oxide particles is the main process. At this stage, MoO3 particle sizes decrease from 30 μm to 60 nm and specific surface area linearly increases to 30 m2/g, the sizes of coherent-scattering regions decrease to 18 nm, paramagnetic centers are accumulated, and the Raman spectral bands corresponding to three different types of Mo-O bonds widen and shift. At doses above 1 kJ/g, the main process consists in the friction and aggregation of particles, which is accompanied by some reduction in the specific surface area and an increase in the particle sizes. At the stage of friction, the phase transition from an orthorhombic modification to a monoclinic modification of MoO3 occurs seemingly due to a shift of one layer of the material in plane (100). The shift is accompanied by the accumulation of lattice microstrains in the same plane, formation of "stressed” Mo-O-Mo bridge bonds, and a substantial rise in the concentration of Mo5+ radicals. The maximum total concentration of paramagnetic centers is 1 × 1018 g−1. It may be assumed that the radicals are formed due to the rupture of the most stressed molybdenum-oxygen bridge bonds. Pleiades Publishing, Ltd., 2015 Sivak M. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Streletskii A. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Kolbanev I. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Leonov A. Department of Chemistry, Moscow State University, 119992, Moscow, Russia aut Degtyarev E. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut Permenov D. Central Research Institute of Chemistry and Mechanics, ul. Nagatinskaya 16a, 115487, Moscow, Russia aut Colloid Journal Pleiades Publishing 77/3(2015-05-01), 333-340 1061-933X 77:3<333 2015 77 10595 https://doi.org/10.1134/S1061933X15030163 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1134/S1061933X15030163 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sivak M. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Streletskii A. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Kolbanev I. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Leonov A. Department of Chemistry, Moscow State University, 119992, Moscow, Russia aut NATIONALLICENCE 700 1- Degtyarev E. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Permenov D. Central Research Institute of Chemistry and Mechanics, ul. Nagatinskaya 16a, 115487, Moscow, Russia aut NATIONALLICENCE 773 0- Colloid Journal Pleiades Publishing 77/3(2015-05-01), 333-340 1061-933X 77:3<333 2015 77 10595