Table 2 Chemical analyses of representative coins of group 1, obtained using microprobe analysis on the external and deeper layers. Ex-layer: external layer; Int-gray: internal core (copper-rich β-phase); Int-island (silver-rich α-phase).
From: FIB-FESEM and EMPA results on Antoninianus silver coins for manufacturing and corrosion processes
Coins | A | B | D | E | F | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ex- layer | Int- gray | Int- island | Ex- layer | Int- gray | Int- island | Outer Ex- layer | Inner Ex- layer | Int- gray | Int- island | Ex- layer | Int- gray | Int- island | Ex- layer | Int- gray | Int- island | |
Ag wt.% | 88.01 | 3.30 | 73.20 | 91.88 | 4.47 | 68.50 | 87.61 | 3.24 | 7.98 | 87.36 | 81.60 | 2.62 | 70.30 | 69.60 | 2.75 | 77.60 |
Cu | 10.88 | 94.50 | 26.03 | 7.06 | 94.73 | 31.20 | 8.00 | 93.57 | 89.06 | 9.70 | 15.60 | 95.51 | 27.01 | 28.88 | 96.83 | 19.60 |
Au | 0.02 | 0.15 | 0.02 | 0.00 | 0.00 | 0.01 | 0.16 | 0.01 | 0.18 | 0.03 | 0.00 | 0.00 | 0.03 | 0.00 | 0.109 | 0.00 |
As | 0.01 | 0.06 | 0.01 | 0.01 | 0.09 | 0.01 | 0.00 | 0.09 | 0.27 | 0.02 | 0.21 | 0.12 | 0.02 | 0.11 | 0.11 | 0.33 |
Pb | 0.03 | 0.09 | 0.03 | 0.03 | 0.00 | 0.10 | 2.47 | 0.54 | 0.16 | 1.25 | 0.03 | 0.04 | 1.25 | 0.04 | 0.00 | 0.05 |
Sn | 0.98 | 2.17 | 1.03 | 0.16 | 0.11 | 0.05 | 1.06 | 2.29 | 1.45 | 1.03 | 1.60 | 1.53 | 1.03 | 0.56 | 0.44 | 1.55 |
Ni | 0.01 | 0.02 | 0.01 | 0.04 | 0.01 | 0.00 | 0.04 | 0.09 | 0.13 | 0.08 | 0.00 | 0.00 | 0.08 | 0.01 | 0.06 | 0.00 |
Zn | 0.01 | 0.04 | 0.02 | 0.01 | 0.00 | 0.00 | 0.15 | 0.00 | 0.17 | 0.03 | 0.00 | 0.00 | 0.03 | 0.00 | 0.00 | 0.00 |
Fe | 0.01 | 0.05 | 0.01 | 0.45 | 0.27 | 0.20 | 0.02 | 0.07 | 0.04 | 0.27 | 0.77 | 0.03 | 0.27 | 0.57 | 0.01 | 0.77 |
tot | 99.96 | 100.37 | 100.35 | 99.64 | 99.68 | 100.07 | 99.52 | 99.90 | 99.43 | 99.77 | 99.81 | 99.85 | 100.02 | 99.77 | 100.32 | 99.90 |
