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Related Experiment Videos

Development of a compact six-circle goniometer.

D J Tweet1, H Oyanagi

  • 1Electrotechnical Laboratory, 1-1-4 Umezono, Tsukuba, Ibaraki 305, Japan.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary
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A versatile six-axis goniometer was developed for X-ray diffraction and absorption fine structure studies. This instrument enables temperature-dependent experiments, demonstrating its capability with a Bi(2)Sr(2)CaCu(2)O(8) single crystal.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • X-ray Spectroscopy

Background:

  • Advanced X-ray techniques like anomalous X-ray diffraction (AXD) and X-ray absorption fine structure (XAFS) require precise sample positioning and environmental control.
  • Existing diffractometers may lack the versatility for both vertical and horizontal scattering planes or integrated low-temperature capabilities.

Purpose of the Study:

  • To design and construct a compact, versatile six-axis goniometer for AXD and XAFS experiments.
  • To integrate temperature-dependent capabilities for studying materials under varying thermal conditions.
  • To develop user-friendly control and data acquisition software for the goniometer system.

Main Methods:

  • A six-axis goniometer combining a four-circle (omega, 2theta, phi, chi) and a two-circle setup was engineered.

Related Experiment Videos

  • The system was integrated with a tunable X-ray undulator at SPring-8 for X-ray experiments.
  • A closed-cycle helium cryostat was mounted for temperature control from 330 K down to 14 K.
  • Standard data acquisition software with a graphical user interface was developed for Ethernet control.

    • Main Results:

    • The goniometer demonstrated versatility for both vertical and horizontal scattering plane configurations.
    • Temperature-dependent measurements were successfully performed on a Bi(2)Sr(2)CaCu(2)O(8) single crystal.
    • Superstructure peaks related to one-dimensional modulations were recorded as a function of temperature above 20 K.

    Conclusions:

    • The developed six-axis goniometer is a compact and versatile instrument suitable for advanced X-ray diffraction and absorption fine structure studies.
    • The system's integrated cryostat and user-friendly software facilitate efficient temperature-dependent material characterization.
    • The preliminary experiments confirm the goniometer's effectiveness in capturing subtle structural modulations in complex materials.