TY - JOUR
T1 - Optimizing high-pressure pair distribution function measurements in diamond anvil cells
AU - Chapman, KW
AU - Chupas, PJ
AU - Halder, GJ
AU - Hriljac, Joseph
AU - Kurtz, C
AU - Greve, BK
AU - Ruschman, CJ
AU - Wilkinson, AP
PY - 2010/4/1
Y1 - 2010/4/1
N2 - Pair distribution function (PDF) methods have great potential for the study of diverse high-pressure phenomena. However, the measurement of high-quality, high-resolution X-ray PDF data (to Q(max) > 20 angstrom(-1)) remains a technical challenge. An optimized approach to measuring high-pressure total scattering data for samples contained within a diamond anvil cell (DAC) is presented here. This method takes into account the coupled influences of instrument parameters (photon energy, detector type and positioning, beam size/shape, focusing), pressure-cell parameters (target pressure range, DAC type, diamonds, pressure-transmitting media, backing plates, pressure calibration) and data reduction on the resulting PDF. The efficacy of our approach is demonstrated by the high-quality, high-pressure PDFs obtained for representative materials spanning strongly and weakly scattering systems, and crystalline and amorphous samples. These are the highest-resolution high-pressure PDFs reported to date and include those for alpha-alumina (to Q(max) = 20 angstrom(-1)), BaTiO3 (to Q(max) = 30 angstrom(-1)) and pressure-amorphized zeolite (to Q(max) = 20 angstrom(-1)).
AB - Pair distribution function (PDF) methods have great potential for the study of diverse high-pressure phenomena. However, the measurement of high-quality, high-resolution X-ray PDF data (to Q(max) > 20 angstrom(-1)) remains a technical challenge. An optimized approach to measuring high-pressure total scattering data for samples contained within a diamond anvil cell (DAC) is presented here. This method takes into account the coupled influences of instrument parameters (photon energy, detector type and positioning, beam size/shape, focusing), pressure-cell parameters (target pressure range, DAC type, diamonds, pressure-transmitting media, backing plates, pressure calibration) and data reduction on the resulting PDF. The efficacy of our approach is demonstrated by the high-quality, high-pressure PDFs obtained for representative materials spanning strongly and weakly scattering systems, and crystalline and amorphous samples. These are the highest-resolution high-pressure PDFs reported to date and include those for alpha-alumina (to Q(max) = 20 angstrom(-1)), BaTiO3 (to Q(max) = 30 angstrom(-1)) and pressure-amorphized zeolite (to Q(max) = 20 angstrom(-1)).
KW - Serratia
KW - Escherichia coli
KW - uranyl phosphate
KW - uranium
KW - sodium phytate
U2 - 10.1107/S0021889810002050
DO - 10.1107/S0021889810002050
M3 - Article
VL - 43
SP - 297
EP - 307
JO - Journal of Applied Crystallography
JF - Journal of Applied Crystallography
ER -