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Peak and first-break temperatures of DTA curves of α and β-CaSO4· 1/2H2O
| Bulk pressure (torr) | Endotherm | Exotherm | ||
|---|---|---|---|---|
| TPeaka(°C) | Tfbb(°c) | Tpeaka(°C) | Tfbb(°c) | |
| α-CaS04·1/2H20 | ||||
| 760 | 198 | 158 | 217 | (c) |
| 380 | 182 | 146 | 200 | (c) |
| 1 | 132 | 97 | 163 | (c) |
| β-CaS04·1/2H20 | ||||
| 760 | 195 | 155 | 375 | 322 |
| 1 | 132 | 94 | 375 | 324 |
Tpeak is the peak temperature.
Tfb is the first-break temperature.
Because the endothermic and exothermic curves overlap not possible to determine Tfb for exothermic curve.
