Evolution of long-range and short-range order in La0.67Ca0.33MnO3-delta during solid-state transformation using high-energy ball milling.
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Biomedical subjects
W T Elam
Publications and source records attributed to W T Elam.
Reliability of structural parameters determined from DAFS data using the iterative dispersion integral algorithm.
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Sample-angle feedback for diffraction anomalous fine-structure spectroscopy.
Diffraction anomalous fine-structure (DAFS) experiments measure Bragg peak intensities as continuous functions of photon energy near a core-level excitation. Measuring the integrated intensity at each energy makes the experiments prohibitively slow; however, in many cases DAFS can be collected quickly by measuring only the peak intensity at the center of the rocking curve. A piezoelectric-actuator-driven stage has been designed and tested as part of a sample-angle feedback circuit for locking onto the maximum of the rocking curve while the energy is scanned. Although software peak-tracking requires only a simple calculation of diffractometer angles, it is found that the additional hardware feedback dramatically improves the reproducibility of the data.
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