Phase Change Materials: eutectic
Phase change material (PCM) properties — melting point, latent heat, density, thermal conductivity, specific heat, and cycle life for paraffins, salt hydrates, fatty acids, and eutectics
| pcm category | material id | chemical formula | cycling stability | density liquid kg m3 (kg/m3) | density solid kg m3 (kg/m3) | latent heat kJ kg (kJ/kg) | material name | melting point C (C) | notes | specific heat liquid kJ kgK (kJ/kgK) | specific heat solid kJ kgK (kJ/kgK) | supercooling tendency | thermal conductivity liquid W mK (W/mK) | thermal conductivity solid W mK (W/mK) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| eutectic | cacl2_mgcl2_eutectic | CaCl2 66.6%-MgCl2 33.4% | good | 1,470 | 1,590 | 95 | CaCl2-MgCl2 Eutectic | 25 | Low-cost inorganic eutectic near room temperature; corrosive to metals; inhibitors needed; good volumetric density; used in cold-chain TES | 2.6 | 2.2 | moderate | 0.58 | 0.72 |
| eutectic | galinstan | Ga68.5In21.5Sn10 | excellent | 6,440 | 6,440 | 50 | Galinstan (Ga-In-Sn) | -19 | Liquid metal alloy; mp −19°C; non-toxic alternative to mercury; outstanding TC; gallium oxidizes on surface forming Ga2O3 skin; commercial product | 0.4 | 0.37 | moderate | 22.5 | 25 |
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