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Preparation of Silicon Nitride and Oxonitride by Gas-Phase Pyrolysis of Hexamethyldisilazane

  • NEW TECHNOLOGIES OF PREPARATION AND TREATMENT OF MATERIALS
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Inorganic Materials: Applied Research Aims and scope

Abstract

The technique was developed, the installation was done, and the conditions for the production of Si3N4 and Si2N2O by the method of gas-phase pyrolysis of hexamethyldisilazane (CH3)3-Si-NH-Si-(CH3)3 (HMDS) were experimentally studied. In the experiments, two different methods of inputting the raw material were used—the input of a vapor–gas mixture (bubbling feeder with heating to supply the HMDS vapor in a stream of carrier gases) and input as a gas-droplet stream (pneumatic nozzle). The effect of gas-dynamic synthesis conditions at temperatures up to 1100°C on the properties of silicon oxonitride and silicon nitride nanopowders was studied. The influence of the conditions of mixing the reactants, the volume ratio of nitrogen/ammonia, and the content of HMDS in the vapor–gas mixture on the yield of products was shown. The dependences of the degree of conversion of the feedstock on the gas flow rate and the concentration of ammonia in the gas phase were obtained. The optimal conditions for the pyrolysis process were found: temperature, the ratio of the components of the gas mixture, the conditions of mixing, and the contact times of the phases. X-ray amorphous Si3N4 and Si2N2O powders with particle sizes of 50–200 nm and a specific surface area of up to 15 m2/g and powders of alpha modification of silicon nitride Si3N4 in the form of threadlike crystals with a particle diameter of 50–200 nm were obtained.

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Funding

This work was performed according to the State Task of Institute of Metallurgy and Materials Science of the Russian Academy of Sciences, no. 075-00746-19-00.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334, Moscow, Russia

    N. A. Ovsyannikov, Yu. F. Kargin, A. S. Lysenkov, N. A. Alad’ev, S. N. Ivicheva & K. A. Solntsev

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  1. N. A. Ovsyannikov
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  2. Yu. F. Kargin
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  3. A. S. Lysenkov
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  4. N. A. Alad’ev
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  5. S. N. Ivicheva
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  6. K. A. Solntsev
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Correspondence to N. A. Ovsyannikov, Yu. F. Kargin, A. S. Lysenkov, S. N. Ivicheva or K. A. Solntsev.

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Translated by Sh. Galyaltdinov

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Ovsyannikov, N.A., Kargin, Y.F., Lysenkov, A.S. et al. Preparation of Silicon Nitride and Oxonitride by Gas-Phase Pyrolysis of Hexamethyldisilazane. Inorg. Mater. Appl. Res. 11, 488–494 (2020). https://doi.org/10.1134/S2075113320020288

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  • DOI: https://doi.org/10.1134/S2075113320020288

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