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Applied Physics Letters / Volume 92 / Issue 1 / MAGNETISM AND SUPERCONDUCTIVITY

Appl. Phys. Lett. 92, 012512 (2008); http://dx.doi.org/10.1063/1.2827184 (3 pages)

Anomalous microwave heating effects in Ce-doped La0.7Sr0.3MnO3: Possible role of grain boundary capacitative effects across cerium solubility limit

S. N. Kale1, J. Mona1, S. E. Lofland2, S. D. Kulkarni3, and S. B. Ogale3

1Department of Electronics Science, Fergusson College, F.C. Road, Pune 411 004, India
2Department of Chemistry and Physics, Rowan University, Glassboro, New Jersey 08028-1701, USA
3National Chemical Laboratory, Pune 411 008, India

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(Received 1 October 2007; accepted 1 December 2007; published online 8 January 2008)

Ce-doped manganite bulk nanocompacts [La0.7−xCexSr0.3MnO3 (0<x<0.1)] are studied for their microwave heating properties at 2.45 GHz. The heating effect is found to be nonmonotonic as a function of cerium concentration, and anomalously large heating (burning) is observed for a small concentration window near x = 0.03. The x-ray diffraction studies show signatures of CeO2 phase in x>0.03 samples. The various characterizations collectively point to the key role of the developing grain boundary CeO2 layer which leads to highest capacitative intergrain-coupling and related charging-discharging effects when it is thinnest near the apparent Ce solubility limit of x~0.03.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

cerium compounds, combustion, compaction, doping, electrical resistivity, grain boundaries, heat treatment, lanthanum compounds, microwave heating, nanostructured materials, solubility, strontium compounds, X-ray diffraction

PACS

  • 61.72.Mm

    Grain and twin boundaries

  • 82.33.Vx

    Reactions in flames, combustion, and explosions

  • 72.80.-r

    Conductivity of specific materials

  • 81.07.Bc

    Nanocrystalline materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2827184

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    C. Mitra, Z. Hu, P. Raychaudhuri, S. Wirth, S. I. Csiszar, H. H. Hsieh, H.-J. Lin, C. T. Chen, and L. H. Tjeng, Phys. Rev. B 67, 092404 (2003).

    T. Yanagida, T. Kanki, B. Vilquin, H. Tanaka, and T. Kawai, Phys. Rev. B 70, 184437 (2004).

    T. Yanagida, H. Tanaka, T. Kawai, E. Ikenaga, M. Kobata, J.-J. Kim, and K. Kobayashi, Phys. Rev. B 73, 132503 (2006).


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