Open AccessA versatile X‐ray diffraction station at LNLS (Brazil)
Author(s) -
Cusatis Cesar,
Kobayashi Franco Margareth,
Kakuno Edson,
Giles Carlos,
Morelhão Sergio,
Mello Vivaldo,
Mazzaro Irineu
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049598000685
Subject(s) - diffractometer , optics , goniometer , diffraction , angular resolution (graph drawing) , monochromator , physics , materials science , resolution (logic) , powder diffractometer , synchrotron , beam (structure) , powder diffraction , computer science , nuclear magnetic resonance , scanning electron microscope , wavelength , mathematics , combinatorics , artificial intelligence
Versatility was a major consideration in the project to provide an X‐ray diffraction station at LNLS. At least two techniques are possible at the station: powder diffraction and multiple single‐crystal diffraction. A two‐crystal monochromator based on monolithic elastic translators, developed at LNLS, with sagittal focusing by the second crystal, allows 10 mrad of a ≥2 keV monochromatic beam to be used on the diffractometer. The station is equipped with a fast scintillation detector, imaging plates, a high‐energy‐resolution pin‐diode detector, an ionization chamber and a high‐angular‐resolution soller slit. The data collection and control hardware and software were also developed at LNLS. The θ–2θ goniometry for powder diffraction on this 1 m‐diameter diffractometer is based on commercial rotation tables. The multiple single‐crystal goniometry is realized by an independent elastic axis driven by differential micrometers for both high‐ and low‐resolution angular movements. At least four independent axes can be positioned as necessary on the diffractometer table. Powder diffractograms and double‐crystal rocking curves collected with the synchrotron beam show the expected quality.