A minigoniometer for x-ray diffraction studies down to 4K on 4-circle diffractometers equipped with 2D detectors
Résumé
A 'universal' low temperature device for laboratory x-ray diffractometers equipped with 2D detectors has been developed. Single crystal data collections can be performed down to 4K. Due to an original design, the completeness of the data set is not affected by the limited number of accessible orientations of the sample. Classical structure analysis can therefore be performed as well as high resolution (high angle) studies for electron densities analysis. Derived from an idea of Argoud et al., the sample is mounted on a holder magnetically coupled to the diffractometer phi-axis. The coupling is achieved by mounting a master magnet in place of the usual goniometer head. This magnet drives a slave magnet fixed on the crystal holder: a two axis minigoniometer. This low temperature arrangement is adaptable to any kappa geometry single crystal diffractometer equipped with a 2D detector and can be placed into various types of cryostat. This paper reports the home made mechanical design and the performances of this device.
Domaines
Cristallographie
Origine : Fichiers produits par l'(les) auteur(s)