Research Article
Synthesis, Characterization, and Thermal Kinetics of Mixed Gadolinium: Calcium Heptamolybdate System
Table 5
Various kinetic parameters calculated from the TGA using three different relations.
| | STAGE | TG method | Order of reaction () | Activation energy
(K Jmol−1) | Frequency factor
(S−1) | Entropy
(JK−1mol−1) |
| | First | Horowitz-Metzger | | 22.3 | 1.19 | −247 | | Coats-Redfern | | 25.7 | 2 × 10−4 | −259.75 | | Piloyan-Novikova | nil | 9.514 | 4.4 × 10 | −294.3 |
| | Second | Horowitz-Metzger | | 152.31 | 1.0 × 108 | −99.46 | | Coats-Redfern | | 111.86 | 1.6 × 105 | −153.11 | | Piloyan-Novikova | nil | 89.22 | 1.1 × 10 | −328.68 |
| | Third | Horowitz-Metzger | | 100.85 | 1.6 × 104 | −172.67 | | Coats-Redfern | | 87.05 | 2.3 × 10−5 | −341.97 | | Piloyan-Novikova | nil | 38.12 | 9 × 10−2 | −273.53 |
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