The self-diffusion of 18O in Co1-xO was investigated, as a function of O partial pressure and temperature (table 49), by means of secondary ion mass spectrometry. It was found that the predominant defects in the O sub-lattice were doubly-charged O vacancies, VO", at low O partial pressures and singly-charged O interstitials, Oi', at high O partial pressures.
R.J.Tarento, C.Monty: Solid State Ionics, 1988, 28-30, 1221-9
Table 49
Diffusion of O in CoO Monocrystals
Temperature (C) | Method | PO2 (atm) | D (cm2/s) |
1150 | thin-layer | 2.1 x 10-1 | 1.7 x 10-14 |
1150 | thin-layer | 1 x 10-2 | 7.95 x 10-15 |
1150 | thin-layer | 2.5 x 10-3 | 5.90 x 10-15 |
1150 | thin-layer | 1 x 10-4 | 3.10 x 10-15 |
1150 | thin-layer | 2 x 10-6 | 5 x 10-15 |
1150 | thin-layer | 1 x 10-8 | 1.12 x 10-14 |
1200 | thin-layer | 2.1 x 10-1 | 5.37 x 10-14 |
1200 | implantation | 2.1 x 10-1 | 5.45 x 10-14 |
1200 | isotopic exchange | 2.1 x 10-1 | 5.35 x 10-14 |
1200 | thin-layer | 1 x 10-2 | 1.82 x 10-14 |
1200 | thin-layer | 2.5 x 10-3 | 1.17 x 10-14 |
1200 | thin-layer | 5 x 10-4 | 8.3 x 10-15 |
1200 | thin-layer | 1 x 10-4 | 6.75 x 10-15 |
1200 | isotopic exchange | 8.5 x 10-5 | 7.41 x 10-15 |
1200 | thin-layer | 4 x 10-5 | 8.91 x 10-15 |
1200 | thin-layer | 2 x 10-6 | 1.15 x 10-14 |
1200 | thin-layer | 1 x 10-7 | 1.82 x 10-14 |
1200 | thin-layer | 1 x 10-8 | 2.51 x 10-14 |
1250 | thin-layer | 1 x 10-8 | 4.73 x 10-14 |
1300 | isotopic exchange | 2.1 x 10-1 | 3.85 x 10-13 |
1300 | thin-layer | 2.1 x 10-1 | 3.75 x 10-13 |
1300 | thin-layer | 1 x 10-2 | 1.73 x 10-13 |
1300 | thin-layer | 2.5 x 10-3 | 1.04 x 10-13 |
1300 | thin-layer | 5 x 10-4 | 9.33 x 10-14 |
1300 | thin-layer | 1 x 10-4 | 8.51 x 10-14 |
1300 | isotopic exchange | 8.5 x 10-5 | 8.49 x 10-14 |
1300 | thin-layer | 4 x 10-5 | 9.30 x 10-14 |
1300 | thin-layer | 2 x 10-6 | 1.05 x 10-13 |
1300 | thin-layer | 1 x 10-8 | 1.25 x 10-13 |
1400 | isotopic exchange | 2.1 x 10-1 | 5 x 10-12 |
1400 | thin-layer | 2.1 x 10-1 | 1.25 x 10-12 |
1400 | thin-layer | 1 x 10-2 | 7.94 x 10-13 |
1400 | thin-layer | 2.5 x 10-3 | 5.12 x 10-13 |
1400 | thin-layer | 5 x 10-4 | 4.30 x 10-13 |
1400 | thin-layer | 1 x 10-4 | 3.31 x 10-13 |
1400 | isotopic exchange | 8.5 x 10-5 | 3.38 x 10-13 |
1400 | thin-layer | 4 x 10-5 | 3.15 x 10-13 |
1400 | thin-layer | 2 x 10-6 | 3.2 x 10-13 |