18 kW Rotating Four-Circle Diffractometer

The 18 kW is used for:

• X-ray diffraction
• Reciprocal space mapping
• X-ray reflectivity
• Scan in 3-D, angular and reciprocal space
• Pole-figure scan

Specifications:

• 18 kW Ultrex Rigaku Rotating Anode (donated by Abbott Labs in 2006)
  • Cu Anode: Cu Kα₁ λ = 1.5406 Å, Cu Kα₂ λ = 1.54443 Å
  • Point Source: Normal Focus 0.5mm x 10 mm, 18 kW max power
    • The effective source size should be 0.5-mm high by 1-mm-wide due to 6° take-off angle. But we measure the width to be 0.5 mm wide (see figure).
  • Nominal operating power: 50 kV, 240 mA
  • Huber slits for controlling horizontal and vertical divergence (see figure).
  • Nominal setting: hsdgap = 0.7 mm wide by 14-mm-high
  • Graphite (002) Grade ZYA (< 0.5° mosaic) from Advanced Ceramics Corp.
    • Size: 25 x 25 x 2 mm
    • Para- focusing in the horizontal direction
    • Sagital-focusing in the vertical direction with R_s = 225 mm
    • 2d₀₀₂ = 6.708 Å, Cu Kα₁ q_B = 13.28°
    • 1 to 1 focusing, F₁ = F₂ = F = R_S/sin(q) = 980 mm. This is the distance from the source to the mono and from the mono to the sample.
  • Incident beam intensity monitor (NaI detector collecting scattered x-rays from Co coated Kapton foil) I₀ = 8900 cps at hsdgap = 0.7mm and vsdgap = 14 mm.
  • Huber incident beam slits for passing Cu Kα₁ and blocking Cu Kα₂
    • Nominal setting ka2cen = 0,  ka2gap = 0.5 mm-wide by 1-mm high
• Huber 4-circle diffractometer
  • Motorized Z-sample, zsamp=0 should put pin in COR (Center of Rotation)
  • Huber  1006 X-Y- c-f goniometer
  • Sample holder
  • 2-theta arm:  (Nominal settings)
    •  guard slit ( gshhcen=.64, gshgap=1.1,  gsvcen=1.4, gsvgap=8 )
    • XIA filter box, ( T = 0.24 x 0.01 for STB straight thru beam)
    • detector slit, ( dshhcen=.05, dshgap=1.0,  dsvcen=1.9, dsvgap=12 )
    • Cyberstar NaI X-ray detector ( 0 .3 m sec, 740V, Gain = 8, LL=2.5, UL=6.5)
• Auxillary equipment:
  • Laser Level on Tripod
  • X-ray Eye
  • Goniometer pin
  • High-power zoom lens camera