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

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5 Author(s)
Kale, S.N. ; Department of Electronics Science, Fergusson College, F.C. Road, Pune 411 004, India ; Mona, J. ; Lofland, S.E. ; Kulkarni, S.D.
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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.

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Applied Physics Letters  (Volume:92 ,  Issue: 1 )