Internal oxidation of dilute silver alloys

Jun Takada, Yoichi Tomii, Nobuyuki Yoshida, Masahiro Sasaki, Masahiro Koiwa

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12 Citations (Scopus)

Abstract

Internal oxidation of dilute silver alloys containing Al, Mg, Zn, Cu, and Sn was studied in air at temperatures between 573 K and 1173 K. Electrical resistivity, gravimetric, and gas-extraction measurements were made. The general trend of the resistivity is that it increases upon oxidation at lower temperatures and the resistivity decreases at higher temperatures in all of these alloys except Ag-Mg, in which it increases even at 1173 K. The increase in resistivity is considered to be related to the formation of clusters having excess oxygen. A detailed investigation was performed on Ag-Al alloys. The O/Al ratio in the clusters in Ag-2.2 at.% Al is much higher on oxidation at 773 K than for stoichiometric Al2O3 at 1173 K. The clusters release the excess oxygen on subsequent annealing at high temperatures, and decompose to stable Al2O3 at 1173 K.

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalOxidation of Metals
Volume37
Issue number1-2
DOIs
Publication statusPublished - Feb 1 1992

Keywords

  • dilute silver alloys
  • excess oxygen
  • internal oxidation
  • solute-element-oxygen clusters

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Metals and Alloys
  • Materials Chemistry

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    Takada, J., Tomii, Y., Yoshida, N., Sasaki, M., & Koiwa, M. (1992). Internal oxidation of dilute silver alloys. Oxidation of Metals, 37(1-2), 13-22. https://doi.org/10.1007/BF00665628