A versatile X-ray diffraction station at LNLS (Brazil)

• Published in: Journal of synchrotron radiation Vol. 5; no. 3; pp. 491 - 493
• Main Authors: Cusatis, Cesar, Kobayashi Franco, Margareth, Kakuno, Edson, Giles, Carlos, Morelhão, Sergio, Mello Jr, Vivaldo, Mazzaro, Irineu
• Format: Journal Article
• Language: English
• Published: 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.05.1998
• Subjects: diffraction beamline; diffraction station; X-ray diffraction
• ISSN: 1600-5775; 0909-0495; 1600-5775
• DOI: 10.1107/S0909049598000685

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.