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Synchrotron X-ray wavelength calibration using a diamond internal standard: application to low-temperature thermal-expansion studies

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Volume
382
Identifiers
DOI: 10.1016/j.jallcom.2004.05.041
Keywords
  • Silicon Nitride
  • Copper Indium Selenide
  • Lattice Parameter
  • Thermal Expansion
  • Wavelength Calibration
  • Low Temperature
  • Diamond
  • Semiconductors
  • Crystal Structure And Symmetry
  • X-Ray Diffraction
  • Synchrotron Radiation

Abstract

Abstract Typically, wavelength instabilities at synchrotron beams are largely due to thermomechanical phenomena at the primary-beam monochromators and fluctuations of the synchrotron orbit. Although they are small, they may have a negative influence on some kinds of diffraction experiments, for example in thermal expansion studies. Using a wavelength calibration procedure is a natural way of solving or at least reducing this problem. Diamond can be used as a calibration material because of its known low-thermal expansion and low X-ray absorption. Low-temperature X-ray powder diffraction measurements were carried out at the powder diffractometer at the B2 beamline at Hasylab/DESY (Hamburg). The cryostat ensured a good temperature stability and accuracy. Unit-cell parameters for cubic (spinel-type) silicon nitride, c-Si 3N 4, and for copper indium selenide, CuInSe 2, were determined in the temperature range from 14 up to 302 K. An improvement of the data quality due to elimination of the wavelength fluctuation effect is demonstrated.

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