An inhomogeneous paramagnetic state of the LaMnO3 + δ nanoceramics prepared by shock-wave loading

The structural (at T = 300 K) and magnetic properties of LaMnO 3 + δ nanoceramic materials prepared by shock-wave loading have been investigated in the paramagnetic region. The samples contain a mixture of the orthorhombic and rhombohedral phases in different ratios. The Curie-Weiss law is satisfied...

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Bibliographic Details
Published in:Physics of the solid state 2010-06, Vol.52 (6), p.1217-1226
Main Authors: Arbuzova, T. I., Voronin, V. I., Gizhevskiĭ, B. A., Naumov, S. V., Arbuzov, V. L.
Format: Article
Language:English
Subjects:
Magnetism and Ferroelectricity
Physics
Physics and Astronomy
Solid State Physics
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Summary:The structural (at T = 300 K) and magnetic properties of LaMnO 3 + δ nanoceramic materials prepared by shock-wave loading have been investigated in the paramagnetic region. The samples contain a mixture of the orthorhombic and rhombohedral phases in different ratios. The Curie-Weiss law is satisfied in the temperature range T > 440 K > 2 T C , and magnetic polarons are generated in the vicinity of defects at temperatures in the range 300 K < T < 440 K. An increase in the concentration of Mn 4+ ions leads to a decrease in the Curie temperature T C due to the decrease in the total number of Mn ions, the size effects of small particles, and the long-range elastic stresses.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783410060168