The diffusion of 110Ag in Cu2O was measured (table 87), using a serial-sectioning technique, as a function of temperature (700–1132C) and O partial pressure (6 x 10-6 to 8 x 10−2atm). The Ag ions had a larger impurity-vacancy binding free energy and/or a larger jump frequency for the singly charged cation vacancies, relative to that for neutral
cation vacancies. The activation enthalpies for the diffusion of Cu and Ag ions were nearly equal, but the absolute value of DAg was about 3 times larger than DCu; even though the Ag ion was 31% larger than the Cu ion.
Silver-Tracer Diffusion in Cu2O. N.L.Peterson, C.L.Wiley: Journal of Physics and Chemistry of Solids, 1984, 45[3], 295-8
Table 87
Diffusivity of 110Ag in Cu2O
Temperature (C) | PO2 (atm) | D (cm2/s) |
700.7 | 7.55 x 10-5 | 1.23 x 10-9 |
801.2 | 7.55 x 10-5 | 4.71 x 10-9 |
900.9 | 7.55 x 10-5 | 1.47 x 10-8 |
992.3 | 5.99 x 10-6 | 2.05 x 10-8 |
997.4 | 8.29 x 10-4 | 4.97 x 10-8 |
997.5 | 7.94 x 10-2 | 1.08 x 10-7 |
998.3 | 7.55 x 10-5 | 3.46 x 10-8 |
1002.7 | 7.57 x 10-3 | 7.47 x 10-8 |
1131.6 | 7.55 x 10-5 | 1.06 x 10-7 |