Synthesis, Characterization of Elastic and Electrical Properties of Diamond-like BC x Nano-Phases Synthesized under High
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Synthesis, Characterization of Elastic and Electrical Properties of Diamond-like BCx NanoPhases Synthesized under High and Low Pressures Pavel V. Zinin1,2, Alla V. Nozhkina3, Roman I. Romanov4, Vladimir P. Filonenko5, Sergey A. Titov1, Ivan Trojan6, Vyacheslav. Y. Fominski4, Kamil M. Bulatov1, Aleksey A. Bykov1, Igor B. Kutuza1, Alexander Anokhin5, Aleksey M. Lomonosov7 1Scientific and Technological Center of Unique Instrumentation, Russian Academy of Sciences, Moscow, Russia
2Hawaii
Institute of Geophysics and Planetology, University of Hawaii, Honolulu, HI, USA
3National
University of Science and Technology MISiS, Moscow, Russia
4National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow, Russia
5Institute
for High Pressure Physics, Russian Academy of Sciences, Troitsk, Russia
6Shubnikov Institute of Crystallography, FSRC Crystallography and Photonics, Russian Academy of Sciences, Moscow, Russia
7Prokhorov
General Physics Institute, Russian Academy of Sciences, Moscow, Russia
ABSTRACT
This paper presents experimental results on the synthesis of boron rich diamond-like carbon phases (BCx) obtained by high pressure sintering (s-BCx) and pulsed laser deposition (PLD-BCx). It has been shown that sintering of a mixture of a powder of micro-diamonds with a powder of boron in the toroid type high pressure device leads to the creation of s-BCx phase with a low resistivity, and high elastic moduli. The PLD-BCx film found to be rigid with the resistivity as low as that of best conductive boron–doped diamond films. It indicates that the presence of B atoms in a laser plasma leads to the formation of sp3 bonds in the material in the process of chemical sputtering. The combination of unique characteristics can be achieved by changing the ratio B/C. Downloaded from https://www.cambridge.org/core. University of Pennsylvania Libraries, on 10 Jan 2018 at 08:47:40, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2018.5
INTRODUCTION Interest in the synthesis of new hetero-diamonds or cubic BCx (c-BCx) phases was produced by the theoretical prediction on the possibility of high-temperature superconductivity in these materials. The superconducting transition of about 55 K was predicted for boron concentrations between 20-30 (c-BC3, c-BC4) [1]. Superconductivity has been already discovered in boron-doped diamond (~ 2 at.% B) synthesized under high pressure (~ 9 GPa) and temperature (2500 - 2800 K) [2]. High temperature superconductivity (36 K) was discovered recently in borondoped Q-carbon [3]. Theoretical estimates show that the diamond-like BCx phases must have high hardness [4-7] and, more importantly, interesting electrical properties. Synthesis of cubic hetero-nano-diamond BC3 (c-BC3) [8] at 40 GPa and 2000 K confirmed the theoretical prediction that the incorporation of boron atoms in the diamond structure in the system B-C (BC, BC3, BC7) does not lead to a significant distortion of the diamond cubic cell [4, 5]
