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Strength of optical quality polycrystalline CVD diamond

  • Materials for Quantum Electronics and Fotonics
  • Published:
Inorganic Materials: Applied Research Aims and scope

Abstract

The three-point loading method is used to the measure the fracture strength σ f of polycrystalline CVD diamond plates with thickness in the range of h = 0.06–1.0 mm. Optical quality samples grown in a microwave plasma using CH4-H2 gas mixtures show an inherently nonuniform structure, the crystallite size varying (increasing) by 1–2 orders of magnitude in traversing from the substrate side to growth side. The value of σ f approaches ≈ 2200 MPa for the thinnest film when the fine-grained (substrate) side is under tensile stress, reducing with plate thickness down to ≈ 600 MPa at h ≈1000 μm. The strength is approximately a factor of two lower for the substrate side under tensile stress. In general, the material tested follows Hall-Petch relationship—a stress increase with grain size reduction. The fracture statistics are analyzed using a Weibull distribution, and a Weibull modulus m of 6.4 and 4.5 is found for the growth and substrate side under tension, respectively. Young’s modulus E = 1072 ± 153 GPa for polycrystalline diamond is evaluated from the same tests.

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Authors and Affiliations

  1. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russia

    V. G. Ralchenko, D. N. Sovyk & V. I. Konov

  2. Fraunhofer Institute for Applied Solid State Physics IAF, Freiburg, Germany

    E. Pleiler

Authors
  1. V. G. Ralchenko
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  2. E. Pleiler
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  3. D. N. Sovyk
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  4. V. I. Konov
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Additional information

Original Russian Text © V.G. Ralchenko, E. Pleiler, D.N. Sovyk, V.I. Konov, 2011, published in Perspektivnye Materialy, 2011, No. 3, pp. 33–39.

The article was translated by the authors.

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Ralchenko, V.G., Pleiler, E., Sovyk, D.N. et al. Strength of optical quality polycrystalline CVD diamond. Inorg. Mater. Appl. Res. 2, 439–444 (2011). https://doi.org/10.1134/S2075113311050273

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  • DOI: https://doi.org/10.1134/S2075113311050273

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