4-Circle Diffractometer


Instrument description

E5 is a conventional four-circle diffractometer. The instrument is equipped with a two-dimensional position sensitive 3He-detector. The monochromator take-off angle is fixed at 42°. The instrument setup is ideal for the determination of crystal and magnetic structures. 

The wavelength of 0.09 nm allows the investigation of crystal structures with unit cell volumes of up to 2 nm³; the maximum value for a cell length is limited to 2.5 nm. A resonance filter (Er) is available in order to suppress λ/2 contributions. For magnetic structure determination the wavelength of 0.24 nm is accessible. A PG-filter is used to suppress λ/2 contributions.


  • investigation of crystal structures of molecular, ionic or intermetallic systems
  • determination of positional and thermal parameters of  light atoms (H, D or Li)
  • complex magnetic structures (especially to deduce weak magnetic components)
  • structural and magnetic phase transitions (interplay between structural changes and physical properties)

Selected examples

Crystal and magnetic structure of CaCu2O3

Phase transitions in HoVO3

Instrument layout


Instrument Data
Beam tube R3
Monochromator • Cu (222)] in reflection
• PG (002)
Take off angle of monochromator M = 42° (fixed)
Wave length • λ=0.09 nm [Cu (222)]
• λ=0.24 nm [PG (002)]
Flux • 1.2·106 n/cm2s (Cu (220) without filter)
• 3·106 n/cm2s (PG (002) with graphite filter)
Range of scattering angles 10° < 2Θ < 110°
Angle resolution
Range of lattice spacing
d resolution
Sample size max. 8 mm diameter
Detector 2D position sensitive 3He-detector
90 x 90mm2 in area (32 x 32 pixels)
used in single reflection mode
efficiency of detection is 85% at 0.1 nm
Polarized neutrons no
Instrument options
Sample environment
Software MAD

Additional information