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Polycrystalline Co doped La2O3 and CeO2 bulk samples with Co content of 0 ~ 8% were fabricated by conventional ceramic method. XRD and XPS studies indicate no Co metal clusters or secondary magnetic phases in any samples in this study. For both systems it is found that the undoped or slightly doped samples show only diamagnetic signal, while samples with relatively higher Co content exhibit distinct...
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