Research Article
Preparation of CoFe2O4/SiO2 Nanocomposites at Low Temperatures Using Short Chain Diols
Table 3
Thermodynamic parameters at different temperatures for CoO, SiO2, and Fe2O3.
| (°C) | (cal/mol·K) | Δ (kcal/mol) | (cal/mol·K) | Δ (kcal/mol) | CoO | Fe2O3 | SiO2 | CoO | Fe2O3 | SiO2 | CoO | Fe2O3 | SiO2 | CoO | Fe2O3 | SiO2 |
| 25 | 12.6 | 2560 | 2471 | −57.1 | −58.1 | 4.7 | 12.7 | 31.1 | 26.5 | −60.9 | −67.4 | −3.2 | 100 | 12.6 | 3409 | 3291 | −55.8 | 240 | 293 | 16.4 | 884 | 850 | −62.4 | −113 | −47.1 | 200 | 12.7 | 4258 | 4111 | −54.6 | 624 | 663 | 19.4 | 1736 | 1672 | −64.1 | −244 | −173 | 300 | 12.9 | 5107 | 4931 | −53.3 | 1092 | 115 | 21.5 | 2587 | 2494 | −66.2 | −460 | −381 | 400 | 13.0 | 5956 | 5751 | −52.0 | 1645 | 1649 | 23.5 | 3438 | 3316 | −68.4 | −761 | −672 | 500 | 13.2 | 6805 | 6571 | −50.7 | 2283 | 2265 | 25.3 | 4288 | 4137 | −70.9 | −1148 | −1045 | 600 | 13.4 | 7654 | 7391 | −49.3 | 3006 | 2963 | 26.8 | 5139 | 4959 | −73.5 | −1619 | −1499 | 700 | 13.6 | 8503 | 8211 | −48.0 | 3814 | 3744 | 28.3 | 5989 | 5780 | −76.2 | −2176 | −2036 | 800 | 13.8 | 9352 | 9031 | −46.6 | 4706 | 4606 | 29.6 | 6839 | 6601 | −79.1 | −2817 | −2655 | 900 | 14.0 | 10201 | 9851 | −45.2 | 5684 | 5550 | 30.8 | 7690 | 7422 | −82.2 | −3543 | −3357 |
|
|