Kinetics studies and oxide characterization in the internal oxidation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Ag</mml:mi><mml:mi mathvariant="normal">In</mml:mi></mml:math>alloys

Abstract

The internal oxidation of $\mathrm{Ag}\mathrm{In}$ alloys has been investigated by time-differential perturbed angular correlation technique on $^{111}\mathrm{In}$ probes. We studied the oxidation kinetics of dilute (a few ppm) $\mathrm{Ag}\mathrm{In}$ alloys at 300\ifmmode^\circ\else\textdegree\fi{}C under different annealing conditions and 1 at.% indium alloys at 300\ifmmode^\circ\else\textdegree\fi{}C and 550\ifmmode^\circ\else\textdegree\fi{}C. In some cases, the time dependence of the oxidation-front advance was ruled by a power law with an exponent different from 0.5. We determined the hyperfine parameters of ${\mathrm{In}}_{2}$${\mathrm{O}}_{3}$ and studied the influence of the oxidation temperature on the indium sesquioxide precipitation in the silver matrix. A consistent description of the oxides formed at different temperatures is given.