Open AccessA New Powder Diffractometer for Synchrotron Radiation with a Multiple‐Detector System
Author(s) -
Toraya H.,
Hibino H.,
Ohsumi K.
Publication year - 1996
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/s0909049595015500
Subject(s) - detector , diffractometer , powder diffractometer , optics , scintillator , synchrotron radiation , powder diffraction , materials science , synchrotron , scintillation , reflection (computer programming) , radiation , diffraction , physics , computer science , nuclear magnetic resonance , scanning electron microscope , programming language
A new powder diffractometer for synchrotron radiation with six detector arms has been constructed. Five detector arms are attached radially at intervals of 25° to the 2 θ axis and form a multiple‐detector system. Five scintillation counters coupled with flat Ge(111) crystal analyzers on the respective arms can simultaneously record the whole powder pattern divided into five segments, each with an equal 2 θ span. The optics design is based on flat‐specimen reflection geometry using a parallel beam. The intensity data are collected using a 2 θ step‐scan technique in asymmetric diffraction at a fixed incident angle. A sixth multi‐purpose detector arm can be used in the conventional single‐arm scan mode. It can be equipped with various kinds of analyzers such as long horizontal parallel slits, a fiat or channel‐cut crystal analyzer, a receiving slit and a solid‐state detector. Test operations of the multiple‐detector system, conducted at the Photon Factory in Tsukuba, recorded a full width at half maximum of 0.022° and a peak maximum intensity of more than 40000 counts s −1 for the (111) reflection from Si powder. The whole powder pattern of Mg 2 SiO 4 over a 2 θ range of 130° could be step‐scanned at a step interval of 0.004° (2 θ ) in just 4 h. Results of whole‐powder‐pattern decomposition and Rietveld refinement of the Mg 2 SiO 4 pattern are given.