Table 2. Compressibility Data for β- and γ-Cu2V2O7a.
| β-Cu2V2O7 | |||
|---|---|---|---|
| axis | compressibility, K (GPa–1) | direction [u, v, w] | approx. direction [x, y, z] |
| X1 | 31.8 × 10–3 | 0.8031, 0.0000, 0.5959 | 4, 0, 3 |
| X2 | 5.2 × 10–3 | 0.0000, 1.0000, 0.0000 | 0, 1, 0 |
| X3 | 32.1 × 10–3 | 0.7818, 0.0000, −0.6236 | 4, 0, −3 |
| γ-Cu2V2O7 | |||
|---|---|---|---|
| axis | compressibility, K (GPa–1) | direction [u, v, w] | approx. direction [x, y, z] |
| X1 | 5.75 × 10–3 | –0.6089, 0.3500, 0.7118 | –12, 7, 14 |
| X2 | 4.59 × 10–3 | –0.0136, 0.9924, −0.1222 | 0, 1, 0 |
| X3 | 2.28 × 10–3 | 0.9262, 0.2496, 0.2826 | 4, 1, 1 |
a
The principal compression axes (X1, X2, and X3) are represented by black arrows in Figures 2 and 6. The data in the table were calculated using the lattice parameters from the single crystal XRD analysis (Tables S1–S3) and the PASCal principal axis strain calculator.56.