Various transport properties were measured in monocrystals of pure Co1-xO, where x was between 0.003 and 0.044. The 60Co diffusion coefficient was determined at 1200C, for partial pressures of between 0.21 and 32atm and temperatures of between 1064 and 1200C; under a partial pressure of 3.7atm. All of the results exhibited a greater O partial pressure dependence (table 44) than that which was expected on the basis of a point defect theory which assumed the existence of ideal solutions.
K.P.Constant, T.O.Mason, S.J.Rothman, J.L.Routbort: Journal of the Physics and Chemistry of Solids, 1992, 53[3], 405-11
Table 44
Diffusion of 60Co in CoO
Temperature (C) | PO2 (atm) | D (cm2/s) |
1200 | 1 | 1.50 x 10-8 |
1200 | 3.7 | 2.68 x 10-8 |
1200 | 11 | 5.28 x 10-8 |
1200 | 17 | 6.32 x 10-8 |
1200 | 31 | 5.91 x 10-8 |
1138 | 3.7 | 1.74 x 10-8 |
1064 | 3.7 | 1.05 x 10-8 |