Thermomolecular Beam Analysis

Bart et al. (62) have described the enclosure of a Mettler TA-1 thermoanalyzer in a sealed system in order to permit the examination of samples containing alpha and beta/gamma emissions. Samples containing plutonium and uranium may be studied by TG with no radiation hazard to the operator. All balance components could be reached through glove ports. 

Wiedemann, H. G., Achema Congress, Frankfurt, Germany June 26, 1964. 

Stewart, L. N., Proceedings of the Third Toronto Symposiion on Thermal Analysis, H. G. McAdie, ed.. Chemical Institute of Canada, Toronto, February 25-26,1969, p. 205. 

Jacque, L- G. Guiochon. and P. Gendre/. Bull. Sac. Ciuni. France. 1961. 1061. 

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The simultaneously recorded heating X-ray pattern of calcite in vacuum, the TMBA-curve and the mass spectrometric curve for C02 are shown in Fig. 60 and in Fig. 61. It can be seen that the decomposition of calcite in vacuum (10-4 torr) starts already at 420 °C and that it is complete at 660 °C. The equipment and experimental procedure for thermomolecular beam analysis has been discussed in detail in Section 2.4. 

Combining a high-temperature X-ray camera with a thermobalance is difficult due to geometrical and focus problems. However, Wiedemann and Bayer (61) have described such a technique in which high-temperature X-ray diffraction patterns and information about its mass-loss can be obtained on a single sample. This new technique, which they called thermomolecular beam analysis (TMBA), is illustrated schematically in Figure 3.35. The... 

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