Synchrotron and laboratory studies utilizing a new powder diffraction technique

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

OSTI ID:10106028

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: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10106028
• 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
43 PARTICLE ACCELERATORS
430303
440800
47 OTHER INSTRUMENTATION
ACTIVATION, NUCLEAR REACTION, RADIOMETRIC, AND RADIOCHEMICAL PROCEDURES
CALCIUM FLUORIDES
CALCIUM PHOSPHATES
EXPERIMENTAL FACILITIES AND EQUIPMENT
HIGH-TC SUPERCONDUCTORS
IRON OXIDES
MISCELLANEOUS INSTRUMENTATION
SYNCHROTRON RADIATION SOURCES
X-RAY DIFFRACTOMETERS