Periodic thermal instability during the differential thermal analysis of pyrite |
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Authors: | F R A Jorgensen F J Moyle |
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Institution: | (1) CSIRO Division of Mineral Chemistry, P. O. BOX 124, 3207 Port Melbourne, Victoria, Australia |
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Abstract: | The cause of oscillations in high resolution DTA curves was investigated using simultaneous TG supported by microscopic and XRD examination of quenched samples. The latter techniques showed the instability resulted from the sequential ignition of individual or small groups of particles. This behaviour was different to that observed in our earlier isothermal tests where the oscillations were caused by periodic cracking of the oxide film.
Zusammenfassung Die Ursache von Oscillationen in hochaufgelösten DTA-Kurven wurde durch TG und gleichzeitige Ausführung von mikroskopischen und XRD-Untersuchungen von abgeschreckten Proben erforscht. Die zuletzt genannten Techniken lassen eine Instabilität erkennen, die auf eine regelmässig aufeinanderfolgende Verbrennung von individuellen oder kleinen Gruppen von Partikeln zurückzuführen ist. Dieses Verhalten unterscheidet sich von dem, das in unseren früheren isothermen Testversuchen beobachtet wurde, bei denen die Oscillationen durch periodisches Zerreissen des Oxidfilms verursacht wurden.
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