From: Water-Vapor Sorption Processes in Nanoporous MgO-Al2O3 Ceramics: the PAL Spectroscopy Study
Sample | Positron trapping modes | Free-volume parameters | |||||
---|---|---|---|---|---|---|---|
τ av, ns | τ b, ns | κ d, ns−1 | R 3, nm | ~f 3, % | R 4, nm | ~f 4, % | |
T s = 1100 °C | |||||||
Initial drying | 0.254 | 0.21 | 1.10 | 0.309 | 0.38 | 1.844 | 11.75 |
Water vapor | 0.263 | 0.21 | 1.15 | 0.271 | 0.66 | 1.539 | 2.43 |
Final drying | 0.257 | 0.21 | 1.08 | 0.307 | 0.46 | 1.810 | 8.36 |
T s = 1200 °C | |||||||
Initial drying | 0.232 | 0.19 | 0.94 | 0.319 | 0.26 | 1.852 | 9.62 |
Water vapor | 0.252 | 0.21 | 1.19 | 0.293 | 0.72 | 1.636 | 1.16 |
Final drying | 0.229 | 0.19 | 0.93 | 0.296 | 0.61 | 1.821 | 7.77 |
T s = 1300 °C | |||||||
Initial drying | 0.197 | 0.17 | 0.66 | 0.325 | 0.20 | 1.818 | 6.18 |
Water vapor | 0.213 | 0.19 | 0.80 | 0.340 | 0.52 | 1.630 | 2.40 |
Final drying | 0.198 | 0.17 | 0.63 | 0.327 | 0.20 | 1.807 | 6.06 |
T s = 1400 °C | |||||||
Initial drying | 0.178 | 0.16 | 0.44 | 0.331 | 0.19 | 1.701 | 3.07 |
Water vapor | 0.211 | 0.18 | 0.78 | 0.335 | 0.63 | 1.613 | 1.74 |
Final drying | 0.179 | 0.16 | 0.40 | 0.334 | 0.19 | 1.692 | 3.02 |