Table 1
Refined unit-cell parameters and volumes of zeolite X and its transformation products, gmelinite, natrolite, and smectite, as a function of increasing pressure and heat treatment under water medium
| Pressure (GPa) | Temperature (℃) | Material | Space group | H2O | |||
|---|---|---|---|---|---|---|---|
| b (Å) | c (Å) | ||||||
| Ambient | 25 | Zeolite X | F d -3 m | 24.98(1) | 24.98(1) | 24.98(1) | 15595.8(6) |
| 0.25(5) | 25 | Zeolite X | F d -3 m | 25.03(1) | 25.03(1) | 25.03(1) | 15684.7(3) |
| 0.75(5) | 25 | Zeolite X | F d -3 m | 24.97(1) | 24.97(1) | 24.97(1) | 15562.4(3) |
| 1.00(5) | 25 | Zeolite X | F d -3 m | 24.95(1) | 24.95(1) | 24.95(1) | 15527.6(3) |
| 1.53(5) | 25 | Zeolite X | F d -3 m | 24.92(1) | 24.92(1) | 24.92(1) | 15482.1(3) |
| 1.83(5) | 150 | Gmelinite | P 63/m m c | 13.43(1) | 13.43(1) | 9.28(1) | 1449.3(17) |
| Natrolite | F d d 2 | 18.71(1) | 18.75(1) | 6.57(1) | 2305.8(20) | ||
| Smectite | C 2/m | 5.06(1) | 9.01(1) | 12.09(1) | 551.1(6) | ||
| 2.50(5) | 250 | Natrolite | F d d 2 | 17.07(2) | 20.36(10) | 6.55(2) | 2274.8(19) |
| Smectite | C 2/m | 4.83(1) | 10.21(1) | 11.06(5) | 545.7(4) | ||
| 3.25(5) | 25 | Natrolite | F d d 2 | 17.02(2) | 20.26(5) | 6.56(1) | 2259.8(11) |
| Smectite | C 2/m | 4.83(1) | 10.14(1) | 11.08(3) | 542.4(24) | ||
| 4.51(5) | 250 | Smectite | C 2/m | 4.98(1) | 11.03(1) | 11.69(1) | 642.2(5) |
| 5.18(5) | 25 | Smectite | C 2/m | 4.96(1) | 11.01(1) | 11.64(1) | 636.0(6) |
| Release | 25 | Smectite | C 2/m | 4.79(1) | 12.83(1) | 10.22(1) | 627.5(5) |
| 5.42(1) | 11.26(2) | 11.10(1) | 676.9(15) | ||||
| 5.03(1) | 11.51(1) | 12.17(1) | 705.4(2) | ||||
Econ. Environ. Geol. 2023;56:13~21 https://doi.org/10.9719/EEG.2023.56.1.13
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