Investigation of the role of Ag in Pr1−xAgxMnO3 manganites
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چکیده
X-Ray diffraction, ac susceptibility and electrical resistivity measurements were performed in order to investigate the effect of Ag substitution for Pr in the polycrystalline Pr1−xAgxMnO3 (0.0≤x≤0.25) manganites. The XRD results show that the samples crystallize in the O’orthorhombic structure with a cooperative Jahn-Teller deformation. We give evidence that the Ag is not substituted at the Pr site in the PrMnO3 structure. The increase of TC up to 130 K is suggested to be due to further oxidation of manganite grains by the oxygen released from the metallic silver at high temperatures. No metal-insulator transition was observed in the samples. PACS numbers: 75.47.Lx, 75.50.Dd, 74.62.-c
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تاریخ انتشار 2009