Abstract
A new thermoanalytical technique “Thermo-Molecular Beam Analysis” (TMBA) is described which one allows to continuously follow the weight change in the sample by measurement of its gaseous reaction products, which are analysed simultaneously by mass spectrometry. In addition, the X-ray powder pattern of the sample is recorded at the same time as a function of temperature. Only small, 3–10 mg, samples are needed. The various applications and the information on reaction kinetics which can be obtained with the “TMBA”-method are discussed in detail for three examples: crystallization of lunar glass, thermal decomposition of Ni-oxalate dihydrate and of calcite. One of the main advantages of this new method is the possibility to follow not only the kind and concentration of gases which are evolved during a reaction, but also to identify the solid reaction products, especially metastable phases, and thermal expansion characteristics.
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