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The appearance of the compensation effect (logA=a+bE) in non-isothermal kinetics of solid-phase reactions is discussed.
The air oxidation of copper sheets was followed by thermogravimetry in order to establish the formation of copper(II) oxide and to determine the activation energy of the copper(I) oxide — copper(II) oxide transition. The results were compared with those obtained by using the isothermal procedure.
occurs only after 675 °C. With TG-MS, the fragment at m/z 15 shows an apparition of gases from 180 °C. The emission between 180 and 400 °C observed on TG-MS profiles can be attributed to other volatile products, which contribute to fragment at m/z 15
peaks. The elemental peak intensity reduction and the asymmetry apparition suggest the start of a reaction process between the elements upon milling. A short heat treatment, for only 30 min leads to an even more pronounced asymmetry on the Ni peaks
Sintering of bioceramics using a modified domestic microwave oven
Natural hydroxyapatite sintering
achieves 3.02 g/cm 3 at 1200 °C. The sintered samples were investigated by X-ray diffraction in order to detect any phase transformation ( Fig. 6 ). The X-ray diagrams show the apparition of tetracalcium phosphate (TetCP: Ca 4 O(PO 4 ) 2 ) phase
under air For 1-mm size grains, the dramatic decrease of desulfurization rate after 18 min of 773 K isotherm coincides with the apparition of a continuous and compact bornite intermediate layer ( Fig. 3
