Open Access
Table 2
Room temperature transverse (vt), longitudinal (vl), and mean (vs) sound velocities, bulk (B), shear (G), and elastic (E) moduli, Poisson ratio (r), Gruneisen parameter (γ), as well as Debye temperature (ΘD) for polycrystalline and single-crystalline Cs3Bi2I9
| Sample | vt (m/s) | vl (m/s) | vs (m/s) | B (GPa) | G (GPa) | E (GPa) | r | γ | ΘD (K) | κ (W/(m K)) |
| Polycrystalline | 975 | 1655 | 1080 | 7.2 | 4.6 | 11.4 | 0.23 | 1.4 | 89 | 0.20 |
| Single-crystal ∥c direction | 1200 | 2105 | 1334 | 12.4 | 7.1 | 18.0 | 0.26 | 1.5 | 110 | 0.29 |
| Single-crystal ⊥ c direction | 962 | 1770 | 1073 | 8.9 | 4.4 | 11.2 | 0.29 | 1.7 | 87 | 0.17 |
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