Table 2
Refined unit-cell parameters and volumes of zeolite X and its transformation products, smectite, as a function of increasing pressure and heat treatment under HCO3- solution medium
| Pressure (GPa) | Temperature (℃) | Material | Space group | HCO3- Solution | |||
|---|---|---|---|---|---|---|---|
| b (Å) | c (Å) | ||||||
| Ambient | 25 | Zeolite X | F d -3 m | 24.97(1) | 24.97(1) | 24.97(1) | 15577.1(6) |
| 0.33(5) | 25 | Zeolite X | F d -3 m | 25.02(1) | 25.02(1) | 25.02(1) | 15656.8(5) |
| 0.58(5) | 25 | Zeolite X | F d -3 m | 24.99(1) | 24.99(1) | 24.99(1) | 15600.6(5) |
| 0.83(5) | 25 | Zeolite X | F d -3 m | 24.88(1) | 24.88(1) | 24.88(1) | 15401.8(12) |
| 1.05(5) | 25 | Zeolite X | F d -3 m | 24.88(1) | 24.88(1) | 24.88(1) | 15395.4(11) |
| 1.33(5) | 25 | Zeolite X | F d -3 m | 24.84(1) | 24.84(1) | 24.84(1) | 15333.2(11) |
| 1.58(5) | 25 | Zeolite X | F d -3 m | 24.82(1) | 24.82(1) | 24.82(1) | 15297.5(11) |
| 1.42(5) | 150 | Smectite | C 2/m | 5.25(5) | 9.08(10) | 12.17(1) | 579.3(13) |
| 1.92(5) | 200 | Smectite | C 2/m | 5.30(1) | 8.88(1) | 12.10(1) | 570.2(6) |
| 2.58(5) | 25 | Smectite | C 2/m | 5.28(1) | 8.96(1) | 12.03(1) | 569.2(4) |
| 2.67(5) | 250 | Smectite | C 2/m | 5.29(1) | 8.93(1) | 11.96(1) | 565.0(10) |
| 4.26(5) | 25 | Smectite | C 2/m | 5.24(1) | 8.87(1) | 11.84(1) | 549.7(5) |
| Release | 25 | Smectite | C 2/m | 5.33(1) | 8.92(1) | 12.30(1) | 584.6(5) |
Econ. Environ. Geol. 2023;56:13~21 https://doi.org/10.9719/EEG.2023.56.1.13
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