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X-ray diffraction
GEMaC owns three diffractometers, equipped with a copper anticathode, allowing X-ray diffraction-based structural characterisation of cristalline material under the form of powder, bulk, monocrystals, thin layers deposited on a substrate.
Powder diffractometer Siemens D5000
- two-circles diffractometer (montage θ-θ)
- sealed copper tube (λ = 1.54 Å)
- graphite back monochromator
- scintillator
- sealed copper tube (λ = 1.54 Å)
- graphite back monochromator
- scintillator
Bruker Nonius FR590 diffractometer
High resolution (~10 arcsec), dedicated to the study of single crystals and thin layers.
It is composed of:
- a goniometer having 5 rotation axes (θx, θy, ω, 2θ, φ) and one translation axis z,
- a classical X-ray source (copper anode λ = 1.54 Å) that generates a X-ray beam. The beam is filtered using a germanium monochromator and an input slit.
- a detector (scintillation photomultipler).
It is composed of:
- a goniometer having 5 rotation axes (θx, θy, ω, 2θ, φ) and one translation axis z,
- a classical X-ray source (copper anode λ = 1.54 Å) that generates a X-ray beam. The beam is filtered using a germanium monochromator and an input slit.
- a detector (scintillation photomultipler).
Seifert XRD3000 diffractometer
This system is equipped with a copper source, a 4-circle goniometer: the sample is adjustable in the three directions of space, and is vertically placed on a plane surface, fixed to a stage with motorised rotation motion about the axes ω, 2θ, φ et χ , and several optical elements: Göbel mirror, front monochromator (2 or 4 Ge (220) crystals), absorbers, Soller slits, possibly a back analyser (2 Ge (220) crystals), and a detector composed of a scintillation counter NaI. The various possible applications are acquisition of reciprocal space mapping, and the investigation of cristallographic properties using θ/2θ geometry diffraction, as well as the study of monocrystals in high resolution and rocking curve.
