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  • 1.
    Askari, SJ
    et al.
    Institute of Manufacturing Engineering, PNEC, National University of Sciences and Technology (NUST), Karachi.
    Chen, GC
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Akhtar, Farid
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Lu, FX
    Department of High Tech Thin Films, School of Materials Science and Engineering, University of Science and Technology Beijing.
    Adherent and low friction nano-crystalline diamond film grown on titanium using microwave CVD plasma2008In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 17, no 3, p. 294-299Article in journal (Refereed)
    Abstract [en]

    The use of titanium alloys for aerospace and biomedical applications could increase if their tribological behavior was improved. The deposition of an adherent diamond coating can resolve this issue. However, due to the different thermal expansion coefficients of the two materials, it is difficult to grow adherent thin diamond layers on Ti and its metallic alloys. In the present work microwave plasma chemical vapor deposition (MWPCVD) was used to deposit smooth nano-crystalline diamond (NCD) film on pure titanium substrate using Ar, CH4 and H2 gases at moderate deposition temperatures. Of particular interest in this study was the exceptional adhesion of approximately 2 μm-thick diamond film to the metal substrate as observed by indentation testing up to 150 kg load. The friction coefficient, which was measured with a cemented carbide ball of 10 mm diameter with 20 N load, was estimated to be around 0.04 in dry air. Morphology, surface roughness, diamond crystal orientation and quality were obtained by characterizing the sample with field emission electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) and Raman spectroscopy, respectively.

  • 2.
    Fanchini, G.
    et al.
    Dipartimento di Fisica Sperimentale, Università di Torino.
    Mandracci, P.
    Dipartimento di Fisica Sperimentale, Università di Torino.
    Tagliaferro, A.
    Dipartimento di Fisica Sperimentale, Università di Torino.
    Rodil, S. E.
    Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones.
    Vomiero, Alberto
    Laboratori Nazionali di Legnaro.
    Mea, G. Della
    Laboratori Nazionali di Legnaro.
    Growth and characterisation of polymeric amorphous carbon and carbon nitride films from propane2005In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 14, no 3-7, p. 928-933Article in journal (Refereed)
    Abstract [en]

    In this work, we report about the deposition of a-C(N):H films by electron-cyclotron-resonance using propane as a carbon precursor. The films generally present high H contents (up to 61 at.%) and large optical gaps. The maximum N content we obtained is 13 at.%. In nitrogenated films, we observed a strong decrease of the stretching intensity of the infrared spectra of the hydrocarbon (CHn) vibrations, even at very low nitrogen content, the H content being still comparable to that of pure a-C:H. The various phenomena that can lead to such an effect are discussed: (i) different type of hydrogen bonding (CHn and NHn) in presence and in absence of nitrogenation; (ii) weakening of the cross-section of the CHn groups in presence of nitrogen; (iii) large presence of non-bonded hydrogen meaning, with this, either the presence of molecular H2 or unbounded hydrogen. In addition, the residual amount of IR absorption due to C-H vibrations shows that, in a-CN:H, C-H bonded and non-bonded hydrogen does coexist. © 2005 Elsevier B.V. All rights reserved.

  • 3.
    Fujita, N.
    et al.
    University of Exeter.
    Jones, R.
    University of Exeter.
    Öberg, Sven
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Briddon, P.R.
    University of Newcastle Upon Tyne.
    Large spherical vacancy clusters in diamond: origin of the brown colouration?2009In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 18, no 5-8, p. 843-845Article in journal (Refereed)
    Abstract [en]

    The origin of the brown colouration of diamond is still under discussion. Recent experiments indicate that the brown colour is caused by vacancy-type extended defects, however the shape and size of these defects remains unknown. In this work, we investigate the structural, electrical and optical properties of a large spherical vacancy clusters consisting of 71 vacancies by means of density functional theory. A comparison of our calculations with recent experimental measurements on brown natural diamond shows striking similarities and hence we suggest the brown colouration originates from large spherical vacancy clusters.

  • 4.
    Fujita, N.
    et al.
    University of Exeter.
    Jones, R.
    University of Exeter.
    Öberg, Sven
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Briddon, P.R.
    School of Natural Science, University of Newcastle upon Tyne.
    Theoretical investigation on the interaction of nitrogen with dislocations in single crystal CVD diamond2008In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 17, no 2, p. 123-126Article in journal (Refereed)
    Abstract [en]

    In recent experimental studies, evidence for an atmosphere of nitrogen around the cores of dislocations was found in irradiated single crystal CVD diamond. In this paper, we present a first-principles study on the interaction of nitrogen with dislocations in single crystal CVD diamond, where dislocations are observed as mixed-type 45° and 90° edge-type dislocations lying along <100>. We find a strong binding of nitrogen to the dislocation core for both types of dislocations and show that our results are in consistency with the experiment.

  • 5.
    Goss, J.P.
    et al.
    School of Physics, University of Exeter.
    Coomer, B.J.
    School of Physics, University of Exeter.
    Jones, R.
    School of Physics, University of Exeter.
    Shaw, T.D.
    Department of Physics, University of Newcastle.
    Briddon, P.R.
    Department of Physics, University of Newcastle.
    Öberg, Sven
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mathematical Science.
    Interstitial aggregates in diamond2001In: Diamond and related materials, ISSN 0925-9635, E-ISSN 1879-0062, Vol. 10, no 3, p. 434-438Article in journal (Refereed)
    Abstract [en]

    Theoretical modelling of magnetic resonance signals lead to convincing models for the first three self-interstitial aggregates in diamond. These in turn suggest the manner in which larger more stable aggregates including the platelet, observed in annealed type I diamonds, are formed.

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