The electrical properties of chromium borides, carbides, and nitrides

Lvov, Serguei N.; Nemchenko, V. F.; Kislyi, P. S.; Verkhoglyadova, T.S.; Kosolapova, T. Ya.

doi:10.1007/bf00774426

Cited by 14 publications

(2 citation statements)

References 2 publications

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“…This could be due to depletion in alloying elements from the matrix to the carbide nucleation sites during the cooling process after casting. The electrical properties of chromium carbides were previously investigated by S. N. L'vov et al 21 and it was found that in the temperature range between 0 and 100 • C chromium carbides exhibit electrical conductivity of metallic type. This implies that the higher relative nobility found for the carbides by SKPFM is not due to insulating properties, but to their actual higher corrosion resistance.…”

Section: Resultsmentioning

confidence: 99%

Influence of Grain Boundaries on Dissolution Behavior of a Biomedical CoCrMo Alloy: In-Situ Electrochemical-Optical, AFM and SEM/TEM Studies

Bettini

Leygraf

Lin

et al. 2012

J. Electrochem. Soc.

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Sandvik Materials Technology, SwedenIn this study, preferential sites for metal dissolution during anodic polarization were investigated for a biomedical CoCrMo alloy. As-cast and heat treated materials were compared through a combination of complementary techniques. Scanning Kelvin probe force microscopy mapping suggested the matrix areas adjacent to the carbides to be preferential sites for metal dissolution. By means of in situ electrochemical-optical microscopy it was observed that localized dissolution initiated from the matrix areas adjacent to carbides and grain boundaries in both materials at high anodic potential. By using scanning electron microscopy and transmission electron microscopy/energy dispersive spectroscopy analysis, submicron-sized carbides were found along the grain boundaries, and significant Cr depletion was detected across the grain boundaries for both materials, providing an explanation for the initiation of metal dissolution. A slightly higher metal dissolution was observed for the as-cast sample at high anodic potential, probably due to a more heterogeneous microstructure. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.056209jes] All rights reserved

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Section: Resultsmentioning

confidence: 99%

Influence of Grain Boundaries on Dissolution Behavior of a Biomedical CoCrMo Alloy: In-Situ Electrochemical-Optical, AFM and SEM/TEM Studies

Bettini

Leygraf

Lin

et al. 2012

J. Electrochem. Soc.

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“…Since Cr/Pt forms ohmic contacts to B 12 As 2 , 10 the same metal scheme was tested to determine if the process could be extended to B 12 P 2 . Additionally, Cr forms conductive borides 14 and phosphides 15 of varying composition that are stable to high temperatures. 16,17 Pt also alloys with both B and P, even forming eutectics below 600 C. 18,19 Ni/Au, a wellestablished ohmic contact to p-type GaN, 8 was chosen as an alternate metal scheme.…”

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confidence: 99%

Sintered Cr/Pt and Ni/Au ohmic contacts to B12P2

Frye

Kucheyev

Edgar

et al. 2015

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Icosahedral boron phosphide (B 12 P 2 ) is a wide-bandgap semiconductor possessing interesting properties such as high hardness, chemical inertness, and the reported ability to self-heal from irradiation by high energy electrons. Here, the authors developed Cr/Pt and Ni/Au ohmic contacts to epitaxially grown B 12 P 2 for materials characterization and electronic device development. Cr/Pt contacts became ohmic after annealing at 700 C for 30 s with a specific contact resistance of 2 Â 10 À4 X cm 2 , as measured by the linear transfer length method. Ni/Au contacts were ohmic prior to any annealing, and their minimum specific contact resistance was $l-4 Â 10 À4 X cm 2 after annealing over the temperature range of 500-800 C. Rutherford backscattering spectrometry revealed a strong reaction and intermixing between Cr/Pt and B 12 P 2 at 700 C and a reaction layer between Ni and B 12 P 2 thinner than $25 nm at 500 C. V C 2015 American Vacuum Society.

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