X-Ray Powder Diffraction: Why Not Use CuKβ Radiation?

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DOI: 10.4236/jasmi.2018.83004    1,444 Downloads   4,713 Views  Citations
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ABSTRACT

Cu radiation with a wavelength of λ = 1.3923 ? is recommended for crystal structure determination from X-ray powder diffraction using the Rietfeld method. A highly sensitive image plate detector is able to collect enough intensity to record a brilliant X-ray powder pattern in a reasonable time, compared to CuKα1 radiation used today. Especially atomic displacement coefficients could be determined more precisely with the much greater number of reflections recorded. A double-radius Guinier camera attached to a micro-focus rotating anode tube ensures increased brilliance besides high resolution. A simple construction specification is presented to make smart cylindrically bent Ge(111) or Si(111) X-ray monochromators that deliver focused Cu radiation. The highly linear response of image plate detectors allows removing of fluorescence radiation simply as background of the pattern. The proposed equipment is a cost-efficient alternative to a liquid gallium-metal-jet X-ray source with maximum power load and a similar wavelength of λ(GaKα1) = 1.34013 ?.

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Hermann Otto, H. (2018) X-Ray Powder Diffraction: Why Not Use CuKβ Radiation?. Journal of Analytical Sciences, Methods and Instrumentation, 8, 37-47. doi: 10.4236/jasmi.2018.83004.

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