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17Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2017
USTY PLASMA IN THEMICROWAVE-PLASMA-CHEMICAL COMPLEX SYSTEM
N.N. Skvortsova1, D.V. Malakhov1,2, V.D. Stepakhin1,2 1Prokhorov General Physics Institute, RAS, Moscow Russia, e-mail: mukudori@,mail.ru Pirogov Russian National Medical University, Moscow, Russia, e-mail: 89199945791@mail.ru
In this work the dusty plasma arising in chain exothermic reactions initiated by the microwave radiation of a powerful gyrotron in mixtures of powders of a metal and a dielectricwas studied as a part of new method for synthesis of micro- and nanostructured composite materials.Dusty plasma was observed in the atmosphere of air for mixtures of different metals (titanium, molybdenum, aluminum, and est.) with boron and boron nitridewithout and in the presence of small amounts of C2B1oH12, NaBH4 and H3BO3 as hydrogen sources.
Experiments on dust plasma investigations were made on a special plasma chemical stand with original reactor incorporated into the standard design of the MIG-3 gyrotron complex [1]. In the experiment conditions, the microwave breakdown was followed by free gasdynamic expansion of the powder mixture which created a non-equilibrium plasma-gas-dust medium inside the reactor. Plasma-chemical and exothermic reactions took place under the non-equilibrium conditions of the discharge afterglow leading maintaining the high temperatures of the substances in the reactor [2]. Dust plasma was formed in reactor volume after the switching off the microwave gyrotron pulse. The properties of ensembles of dust particles (tracks, velocities, lifetime, etc.) were measured. It is shown that these charged particles are necessary as the crystallization centers from suspended matter in the creation of composite of substances of microscopic dimensions that arise during secondary plasma-chemical synthesis [3]. The synthesized structures deposited on the impurity particles and on the reactor walls within the reactor. Figures 1 and 2 shows photos of dust particlesin the reactor and structures of synthesized substances for two different mixtures of powders of metals and dielectrics.
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- tg *;a ; n fi. -. .
Figure 2. Dust particles in the reactor on 32 ms after the 2-ms MW pulse. Macro-particle of composition of oxides of titanium (right). Ti+B with H3BO3.
We are grateful to Russian Foundation for Basic Research for financial support (project № 16-38-00651-mol_a). References
[1] Kharchev N K et al. 2013 Rev. Sci. Instrum. 84 013507.
[2] Batanov G M et al. 2016 J. Nanophotonics 10(1) 012520.
[3] Skvortsova N N et al. 2016. Radiophysics and Quantum Electronics.58(9) 701.
Figure 1. Dust particles in the reactor on 32ms after the 4-ms gyrotron pulse (left). Macro-particle of Mo with Bcomposition.Mo+B mixture in air.
