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Phase transformations in Ta-Si system induced by compression plasma flow

Published online by Cambridge University Press:  06 January 2014

Amir Hosein Sari ,
Valentin Mironovich Astashynski ,
Anton Mikhailovich Kuzmitski ,
Yury Aliaksandravich Petukhov  and
Vladimir Vasilevich Uglov
Amir Hosein Sari*
Affiliation:
B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 70 Nezavisimosti ave., Minsk 220072, Belarus
Valentin Mironovich Astashynski
Affiliation:
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15, P. Brovki str., Minsk 220072, Belarus
Anton Mikhailovich Kuzmitski
Affiliation:
A.V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, 15, P. Brovki str., Minsk 220072, Belarus
Yury Aliaksandravich Petukhov
Affiliation:
Belarusian State University of Informatics and Radioelectronics, 6 Brouki str., Minsk 220013, Belarus
Vladimir Vasilevich Uglov
Affiliation:
Belarusian State University, 4 Nezavisimosti ave., Minsk 220030, Belarus
*
ae-mail: [email protected]
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Abstract

In this study, the effect of a dense compression nitrogen plasma flow on a microstructure and the elemental and phase compositions of a “tantalum layer-silicon substrate” system is investigated. Predeposited tantalum thin films (∼2 μm thick) on Si(1 1 1) and Si(1 0 0) substrates were exposed to a single plasma pulse or to a series of pulses. The power density absorbed by the target, plasma pulse duration and discharge current were 1.2 GW/m2, 100 μs and 80 kA, respectively. The temperature field distribution and its time evolution were approximately simulated. SEM and EDX analyses revealed the presence of tantalumrich domains consisting of nano-sized particles and spherical multilevel structures. X-ray diffraction analysis showed the formation of crystalline hexagonal tantalum-rich silicides and tantalum nitride. A mechanism explaining the structural changes and phase transformation of the Ta/Si system is proposed.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 65 , Issue 1 , January 2014 , 10801
Copyright
© EDP Sciences, 2014

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