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Table 2
Melting and cooling temperatures (Tm, Tc) and enthalpies (ΔHm, ΔHc) during thermal cycles for a) Na-0.5Si b)Na-0.25Si microparticles. Data obtained from DSC thermograms for heating and cooling processes.
| Na-0.5Si | Heating | Cooling | ||
|---|---|---|---|---|
| Tm (°C) | ΔHm (J/g) | Tc (°C) | ΔHc (J/g) | |
| Cycle 1 | 294.2 | 25.1 | 264.7 | 11.2 |
| Cycle 2 | 283.7 | 10.9 | 268.8 | 10.7 |
| Cycle 3 | 283.5 | 11.5 | 269.5 | 9.6 |
| Cycle 16 | 282.3 | 5.4 | 266.3 | 5.9 |
| Na-0.25Si | Heating | Cooling | ||
|---|---|---|---|---|
| Tm (°C) | ΔHm (J/g) | Tc (°C) | ΔHc (J/g) | |
| Cycle 1 | 270.5; 293.9 | 26.2 | 281.0; 267.0 | 25.7 |
| Cycle 2 | 270.5; 290.5 | 19.5 | 276.8; 267.5 | 21.5 |
| Cycle 3 | 270.5; 288.2 | 20.0 | 275.1; 267.0 | 22.1 |
| Cycle 16 | 270.5; 288.1 | 20.0 | 274.3; 270.5 | 22.0 |
| Cycle 20 | 270.5; 288.2 | 21.9 | 274.8; 270.0 | 22.7 |
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