Table 1.
Unit-cell parameters as a function of temperature.
| T (K) | a (Å) | Δa | b (Å) | Δb | c (Å) | Δc | V (Å3) | ΔV |
|---|---|---|---|---|---|---|---|---|
| 298 | 4.76599 | 0.00003 | 10.22897 | 0.00007 | 5.99458 | 0.00005 | 292.24 | 0.04 |
| 250 | 4.76458 | 0.00003 | 10.22399 | 0.00007 | 5.99188 | 0.00005 | 291.88 | 0.04 |
| 220 | 4.76379 | 0.00003 | 10.22090 | 0.00007 | 5.99037 | 0.00005 | 291.67 | 0.04 |
| 200 | 4.76311 | 0.00003 | 10.21878 | 0.00007 | 5.98913 | 0.00005 | 291.51 | 0.04 |
| 180 | 4.76279 | 0.00003 | 10.21737 | 0.00007 | 5.98843 | 0.00005 | 291.42 | 0.04 |
| 160 | 4.76259 | 0.00003 | 10.21622 | 0.00007 | 5.98798 | 0.00005 | 291.35 | 0.04 |
| 140 | 4.76241 | 0.00003 | 10.21532 | 0.00007 | 5.98755 | 0.00005 | 291.29 | 0.04 |
| 120 | 4.76204 | 0.00003 | 10.21365 | 0.00007 | 5.98677 | 0.00005 | 291.18 | 0.04 |
| 100 | 4.76189 | 0.00003 | 10.21295 | 0.00007 | 5.98641 | 0.00005 | 291.14 | 0.04 |
| 80 | 4.76187 | 0.00003 | 10.21254 | 0.00007 | 5.98620 | 0.00005 | 291.11 | 0.04 |
| 60 | 4.76189 | 0.00003 | 10.21195 | 0.00007 | 5.98622 | 0.00005 | 291.10 | 0.04 |
| 40 | 4.76181 | 0.00003 | 10.21208 | 0.00007 | 5.98626 | 0.00005 | 291.10 | 0.04 |
| 30 | 4.76184 | 0.00003 | 10.21208 | 0.00007 | 5.98628 | 0.00005 | 291.10 | 0.04 |
| 20 | 4.76184 | 0.00003 | 10.21198 | 0.00007 | 5.98628 | 0.00005 | 291.10 | 0.04 |
| 298* | 4.76595 | 0.00003 | 10.22904 | 0.00007 | 5.99467 | 0.00005 | 292.25 | 0.04 |
Unit-cell parameters and volumes of olivine studied in this work with composition Mg1.84Fe0.16SiO4 at different temperatures between 20 and 298 K.
Data are scaled to 298 K unit-cell parameters of Table 4 for the high-T dataset7 as the differences in unit-cell parameters were negligible. Raw low-T data are available for Mg1.84Fe0.16SiO4 olivine, which contains NIST silicon as internal standard.
*Measured after cooling to verify the perfect reversible behavior before and after the cooling to 20 K.