SYMPOSIA PAPER Published: 01 January 2002
STP11388S

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

Source

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.

Author Information

Anada, H
Sumitomo Metal Industries, Ltd., Amagasaki city, Hogo, Japan
Takeda, K
Sumitomo Metal Industries, Ltd., Amagasaki city, Hogo, Japan
Nasu, S
, Toyonaka city, Osaka, Japan
Kobayashi, Y
, Toyonaka city, Osaka, Japan
Nakamichi, T
, Toyonaka city, Osaka, Japan
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Details
Developed by Committee: B10
Pages: 154–168
DOI: 10.1520/STP11388S
ISBN-EB: 978-0-8031-5468-1
ISBN-13: 978-0-8031-2895-8