Synchrotron and laboratory studies utilizing a new powder diffraction technique

Conference · Thu Oct 01 04:00:00 EDT 1992

OSTI ID:6972274

Knapp, G S; Beno, M A; Jennings, G; Engbretson, M; Ramanathan, M

We have developed a new type of powder diffractometer that is much more efficient than existing methods. The diffractometer has the potential of both high count rates and very high resolution when used at a synchrotron source. The laboratory based instrument has an order of magnitude improvement in count rate over existing methods. The method uses a focusing diffracted beam monochromator in combination with a multichannel detector. The incident x-rays fall on a flat plate or capillary sample and are intercepted by a bent focusing monochromator which has the focus of the bend at the sample surface. The powder diffraction lines emerging from the bent crystal monochromator are detected by a linear or 2-dimensional detector. This allows us to eliminate the background from fluorescence or other scattering and to take data over a range of 3[degrees] to 4[degrees] instead of one angle at a time thereby providing a large improvement over conventional diffractometers. Results are presented for fluorapatite Fe[sub 2]O[sub 3], and a high-TC superconductor.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6972274
• Report Number(s): ANL/MSD/CP-77607; CONF-9208129--5; ON: DE93002981
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
43 PARTICLE ACCELERATORS
430303 -- Particle Accelerators-- Experimental Facilities & Equipment
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47 OTHER INSTRUMENTATION
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CALCIUM PHOSPHATES
CHALCOGENIDES
DIFFRACTOMETERS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HIGH-TC SUPERCONDUCTORS
IRON COMPOUNDS
IRON OXIDES
MEASURING INSTRUMENTS
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIATION SOURCES
SUPERCONDUCTORS
SYNCHROTRON RADIATION SOURCES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTOMETERS