The surface state of Fe50Pd50 alloy ultrafine particles (UFP) has been investigated by AES and XPS. The results show that the surface of Fe50Pd50 alloy UFP was oxidized. There are two kinds of oxidized Fe existing on the surface of Fe50Pd50 alloy UFP. But the element Pd in the alloy UFP was not oxidized and stabilized the UFP. The surface of the alloy UFP is a bilayered structure.
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