Table 1.
DTA and TGA data of the alumina samples.
| Sample | The Weight Loss on the TG Curve, % | Тmax (DTA), °С | ТPT (DTA), °С | |||
|---|---|---|---|---|---|---|
| To 240 °С (Δm1) | From 240 °С to 350 °С (Δm2) | From 350 °С to 550 °С (Δm3) | From 550 °С to 900 °С (Δm4) | |||
| А-1 | 4.8 | 1.0 | 2.2 | 2.0 | 113 | 505 |
| А-2 | 2.5 | 1.0 | 1.3 | 1.9 | (52) 140 | – |
| А-3-Na | 2.3 | 0.9 | 1.0 | 1.6 | (52) 153 | – |
| А-4-K | 2.5 | 0.9 | 0.9 | 1.8 | (52) 136 | – |
| А-1-9C | 6.9 | 0.8 | 3.0 | 1.7 | 86 | 504 |
| А-2-9C | 5.3 | 0.9 | 2.9 | 1.4 | 85 | 436 |
| А-3-Na-9C | 9.1 | 1.0 | 2.5 | 1.3 | 81 | 445 |
| А-4-K-9C | 10.6 | 0.8 | 2.4 | 1.3 | 81 | 444 |
Δm1—weight change determined by TGA at a heating rate of 10°/min to 240 °С integration; ∆m2—weight change determined by TGA at a heating rate of 2°/min to 350 °C and holding 1 h; Δm3—weight change determined by TGA at a heating rate of 10°/min to 900 °С integration. TG: thermal and gravitational. ТPT: The Phase Transition Temperature.