Thermoanalytical curves

Figure 27-3 Thermogravimetric curve for calcium salicylate. [From G. Liptay ed., Atlas of Thermoanalytical Curves (London Heyden and Son, 1976).]...

FIGURE 2.20 Thermoanalytical curves of fresh (a) and old (b) Mn-bentonite (x-axis heating temperature, left y-axis of a and b figures temperature change for DTA curve, right y-axis of a and b figure loss of mass in percent for TG curve). (Reprinted from Konya et al. 2005, with permission from Springer.)... 

FIGURE 2.24 Thermoanalytical curves of silver-montmorillonite. (Reprinted from Konya et al. 2005, with permission from Springer.)... 

Liptay, G. 1973. Atlas of thermoanalytical curves. Budapest Akademiai Kiado. 

Liptay, G. "Atlas of Thermoanalytical Curves" Heyden and Sons New York, 1971 Vol. 2, Section 89. 

The representative thermoanalytical curves of TS-NU-1 series for as-synthesized form are illustrated in Figure 4. The d.t.a. reveals a strong exothermic effect in the range 573 - 753 K. This is due to oxidative decomposition of occluded TMA-OH during... 

Note thermal curve is a loose abbreviation of the more correct term thermoanalytical curve... 

A number of Reference DT A and TGA curves can be found in Liptay G (1971-76) Atlas of Thermoanalytical Curves, Vols 1-5. Heyden, London Sadtler (1965) DTA Reference Thermograms, Vols 1-7. Sadtler, Philadelphia, PA. 

Figure 2 a shoitfs the thermoanalytical curves of PGI -Me. The endothermic peak at 52 on the DSC curve belongs to the melting of PGl2-Me. Its exothermic decomposition starts at 150 C in air atmosphere ... 

Liptay, G., (Weng Zuqi, transl.) Atlas of Thermoanalytical Curves. Jiangsu, Jiangyin Changjing Instrument Factory, 1978, p. 133. 

The endothermic effects are observed for all the samples on the thermoanalytic curves in 90-110°C range, and can be explained by the loss of water and traces of solvent (2-6%). As an example the thermoanalytic curves of III and VI samples are presented on Fig.I. The exoeffects, that appeares at higher temperatures, confirms a destruction of surface layer and goes via the three stages (270-300°C, 320-330°C5, and 500-650°C). General weight loss of the samples (15-19%) correlates with the results of their elemental analysis. 

The next examples illustrate the greater detail that can be obtained when thermogravimetry and DTA are combined. The experiments can be carried out either simultaneously or successively. Figures 7.10 and 7.11 show copies of two pages from the "Atlas of Thermoanalytical Curves." The measurements were made with the Derivatograph as described in Fig. 7.6. In addition to differential thermal analysis and thermogravimetry, the derivative of the... 

G. Liptay "Atlas of Thermoanalytical Curves," Vols. 1-5 Heyden, London, 1971-76. 

Fig. 90 - Left chart of leasible thermoanalytical effects (exemplified by the most common crest-like curves) and the inherent degree of information contents. Right typical shapes of the thermoanalytical curves recorded by individual instruments in dependence to the monitored physical properly, Z, as a function of temperature, T. Simpler shapes can be gradually converted into more complicated ones dual differentiation (break to wave through mathematical manipulation, dZ/dT) or by simple geometrical combination (wave is composed of two subsequent breaks, etc.). Characteristic points marked by circles arc described in the text. ...

The information coded in a thermoanalytical curves can be found gradually richer, along the increasing reliance on the type of experiment carried out, as illustrated in Fig 90. 

Fig. 52. Thermoanalytical curves in carbon monoxide for (Eu,Y)2(S03)j SHjO showing the formation of Eu-activated Y O S by reduction at 500°C (Koskenlinna et al., 1976a).

Fig. 90. The thermoanalytical curves of Na3Gd(SeO.,)3 HjO. Sample weight 21.3 mg heating rate 10° min" (Nabar and Khan-dekar, 1984).

Fig. 130. The thermoanalytical curves for NH4Yb(Cr04)2 HjO in air up to 800°C. The horizontal levels correspond to calculated stoichiometries as indicated. (Aamio et al., 1981.)...

Step I occurs between 110 and 150°C and step II between 218 and 232°C under N2 atmosphere or between 170 and 224°C under reduced pressure. The ligand can be collected during step II 2md identified by its melting point and its IR spectrum. Appropriate treatment of the thermoanalytical curves allows the determination of the enthalpy change of the ligand dissociation and of the activation... 

X.-C. Zeng, Y. Chen, X.-N. Chen, J.-Q. Xie, F.-B. Jiang, Thermo-kinetic research method for faster reactions modifier method of distorted thermoanalytical curve. Thermochim. Acta 332(1), 97-102 (1999). doi 10.1016/80040-6031(99)00092-1... 

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