ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A diamond anvil high-pressure cell especially designed for single-crystal x-ray diffraction studies is described, and with its commercial STOE goniometer head the new cell fits to almost every diffractometer type in use. In this high-pressure cell the x-ray beam passes nearly perpendicular to the pressure generating force. This geometry also allows the cell to be used on Weissenberg cameras, but with double-radius film cylinders and adequately enlarged layer line screens. A knee-type lever arm system generates the thrust. In the path of the beams there are no longer larger beryllium parts, which has improved the signal-to-noise ratio. Approximately 90% of all possible non-Friedel reflections for Bragg angles up to 45° can be measured in the bisecting (cursive-theta=ω) position, up to 95% with general diffractometer settings. An analytic absorption correction was used with beryllium gasketing to eliminate the need to know the thickness of the gasket between the two diamonds. The highest pressure reached which gave satisfactory results was 2.3 GPa. Inconel gaskets were used to collect data at pressures up to 10.2 GPa. Corrections for shadowing by the beams of the cell, absorption, and overlapping of sample reflections from other single crystals inside the cell are calculated using a special control program.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1138380
