STP1423

    Chemical State Analysis of Sn and Fe in ZrO2 by Mössbauer Spectroscopy

    Published: Jan 2002


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    Abstract

    Chemical states of Fe and Sn were investigated by Mössbauer spectroscopy using a specially made Zircaloy-4 sheet in which 57Fe and 119Sn isotopes were enriched. Chemical states were compared between these elements in matrix and in oxide corroded in steam at 400°C. As a result, almost all of Fe in Zircaloy-4 matrix precipitated as the intermetallic compounds Zr(Cr0.33,Fe0.67)2. Fe in ZrO2 existed as Fe2+ ions and intermetallic compounds. The amount of Fe2+ in ZrO2 increased with oxidation of Zircaloy-4 during corrosion testing, especially in ZrO2 near the outside surface. Sn dissolved in Zircaloy-4 matrix, and no Zr-Sn intermetallic precipitates were found. Sn exists as Sn2+ and Sn4+ in ZrO2. Correspondence of the alloying element in Zircaloy-4 to corrosion procedure is discussed.

    Keywords:

    Mössbauer spectroscopy, Zircaloy-4, corrosion resistance, Fe, 57, Fe Sn, 119, Sn, chemical state, heat treatment


    Author Information:

    Anada, H
    Sumitomo Metal Industries, Ltd., Amagasaki city, Hogo,

    Takeda, K
    Sumitomo Metal Industries, Ltd., Amagasaki city, Hogo,

    Nasu, S
    Osaka University, Toyonaka city, Osaka,

    Kobayashi, Y
    Osaka University, Toyonaka city, Osaka,

    Nakamichi, T
    Osaka University, Toyonaka city, Osaka,


    Paper ID: STP11388S

    Committee/Subcommittee: B10.02

    DOI: 10.1520/STP11388S


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