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РОССИЙСКАЯ АКАДЕМИЯ НАУК УРАЛЬСКОЕ ОТДЕЛЕНИЕ ИНСТИТУТ ХИМИИ TBEPДОГО ТЕЛА |
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| 14.11.2009 |
 
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(a) SEM image. (b) Model A. (c) Model B. (d) Without size effect. (e) With size model A. (f) With size model B. Fig. 1. (Color online) (a) SEM image of CrO2 nanorods, the schematic shapes of (b) size model A and (c) size model B for Rietveld refinement, and refinement results (d) without size effect, (e) with size model A, and (f) with size model B. Fig. 2. (Color online) The temperature dependence of (a) lattice constants for tetragonal structure and (b) the volume of the unit cell. The Inset shows the rutile crystal structure. Each chromium atom is surrounded by six oxygen atoms (yellow balls) forming a CrO6 octahedron. Fig. 3. (Color online) The temperature dependences of (a) apical bond length da and equatorial bond length de in CrO6 octahedron, and (b) the relative ratio of da/de related to a distortion of CrO6 octahedron. The Inset shows the configuration of CrO6 octahedron in the rutile structure. The apical bond direction da is perpendicular to the c-axis, while the equatorial bond direction de lies in a plane including the c-axis. Fig. 4. (Color online) (a) The temperature dependence of the calculated magnetic moment of CrO2 nanorods from neutron data and the magnetization measured by SQUID, (b) the temperature dependence of resistance R(T) and the differential
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395K), a dominant lattice distortion in the tetragonal phase was not a change along the 
