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Berestovaya Alina
THE PLAN
Introduction
1. An urgency of work
2. The description of the experimental equipment
2.1 The equipment of the differentials-thermal analysis
2.2 The equipment of the spectral analysis
2.3 The equipment of the x-ray phase analysis
3. Results the research of systems
4. Calculation of systems
5. Ecological aspects of work
Conclusions
The list of the used literature
Peroxides connections of sodium are one of the most reactionary - capable substances cooperating with the majority of connections, including with waterless salts. Reaction with salts are accompanied by a big thermal effect owing to that they are realized in a mode of self-propagation interactions (SPI) after the initiation of corresponding systems by a high-temperature source. The big interest represents the interaction of peroxides connections with connections of iron and zinc. Namely three systems have been considered and analysed: Fe2(SO4)3 - ZnO – NaO2, ZnSO4 – Fe2(SO4)3 – NaO2, Fe2O3 – ZnSO4 – NaO2.
During studying of these systems the following methods were used:
1. Differentials-thermal analysis (DTA);
2. Definition of speeds SHI;
3. The spectral analysis of products of interaction systems;
4. The x-ray phase analysis of products of interaction systems (RPÀ).
In conditions DTA have been established, that the temperature of interaction in systems of moles parity has made 250ºC.
By the results of experiment, the average speed of spreading the front of burning in the system of Fe2(SO4)3 - ZnO – NaO2 makes 93 mm/minute, and in system ZnSO4 – Fe2(SO4)3 – NaO2 - 105,62mm/minutes.
With the help of infrared spectroscopical analysis of interaction products of systems it was possible to identify only sulfate of sodium and oxides Fe2O3 and ZnO. For more exact and full definition of chemical of chemical compound of interaction products in investigated systems has been carried out x-ray phase analysis.
Data of RPA allow to approve, that in chemical compound of firm phase product the system of Fe2(SO4)3- ZnO – NaO2, Na2SO4, ZnO and Fe2O3are present. Reflexes Fe2O3 in given system are shown badly, it can be connected with possible formation in the system of zinc ferrite ZnFe2O4 not so intensive peaks of which are also observed on the roentgenogram.
In system of Fe2O3 – ZnSO4 – NaO2 on data of RPA different phases of Fe2O3 and Na2SO4, and also ZnO. It is very difficult to make conclusions about an opportunity of formation of zinc ferrite, because we have only one good coincidence between the meaning of interplane distances of clean substance and a researched model in it.
In the system of ZnSO4 – Fe2(SO4)3 – NaO2 there are different phases Na2SO4, and also ZnO and Fe2O3. ZnO and Fe2O3 in this system are shown badly, it testifies about the availability of ferrite in products of this system the reflexes of that can be seen on the roentgenogram. The results of RPA are shown in figure.
1 - Fe2(SO4)3 – ZnO – NaO2; 2 - Fe2O3 – ZnSO4 - NaO2; 3 - ZnSO4 – Fe2(SO4)3 - NaO2; 4 - ZnFe2O4
Figure – Results x-ray phase analysis.
Detection of phases of zinc ferrite in interection products of systems Fe2(SO4)3 - ZnO – NaO2 and ZnSO4 - Fe2(SO4)3 – NaO2 by the method of RPA allows to draw a conclusion, that it is possible to receive ferrite by the method of self-propagation interactions.
In system of Fe2O3 – ZnSO4 – NaO2 ferrite, obviously, is not formed, as in connection with small thermal effect in it necessary temperatures do not develop for it. From the result of the done work it is clear, receipt in threefold systems of ferrite by the method of SHI is possible.
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