Technological facilities

  • Scanning Electron Microscopy & X-Rays Microanalysis

  • 3D Digital Microscope

  • X-Rays Microtomography

  • Glow Discharge Optical Emission Spectrometry

  • Vibrational spectrometry

  • X-ray diffraction

  • Non-contact surface topography measurements

  • Laser granulometry

  • Microhardness

  • Differential Scanning Calorimetry (DSC)

  • Salt spray chambers


  • Analyses et surface
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    X-ray diffraction



    Principle

    The sample is mounted on a goniometer and gradually rotates while being bombarded with X-rays, producing a diffraction pattern of regularly spaced spots known as diffractions.

    The diffracted beams add constructively in a few specific directions, determined by Bragg’s law:

    - n. = 2.d.sin ø

    Here d is the spacing between diffracting planes, θ is the incident angle, n is any integer, and λ is the wavelength of the beam. These specific directions appear as spots on the diffraction pattern.

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    Principle of X-rays diffraction

    The goniometric counter measures diffracted X-Rays intensity as a function of the diffraction angle. Plotting the angular positions and intensities of the resultant diffracted peaks of radiation produces a pattern, which is characteristic of the sample. Where a mixture of different phases is present, the resultant diffractogram is formed by addition of the individual patterns.

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    Characteristics :

    - Powdered or massive,
    - X-rays source : 30kV, 15 mA , copper anticathode

    Goniometer :
    - lenght : 150 mm,
    - angle range from -3° to 150° (2theta),
    - scan speed : from 0,01° to 100°/min (2theta)


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