Nanoscale Research Letters

Table 2 Positron trapping modes and free-volume nanopore parameters related to o-Ps decaying determined from four-term decomposed PAL spectra of MgO-Al₂O₃ ceramics sintered at different T _s temperatures

From: Water-Vapor Sorption Processes in Nanoporous MgO-Al₂O₃ Ceramics: the PAL Spectroscopy Study

Sample	Positron trapping modes			Free-volume parameters
Sample	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

Back to article page