X-ray powder diffractometer X-ray powder diffractometer.

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Presentation transcript:

X-ray powder diffractometer X-ray powder diffractometer

X-ray powder diffractometer film, image plate, or area detector film, image plate, or area detector

Braggs' law = 2d hkl sin  hkl X-ray diffraction Debye rings Diameters give  s Debye rings Diameters give  s

X-ray powder diffractometer film or image paper rarely used now

X-ray powder diffractometer radiation counter radiation counter

X-ray powder diffractometer

To maintain the focusing geometry, when counter is rotated at rate of 2  /min, specimen is also rotated at rate of  /min  /min  /min

X-ray powder diffractometer

Solid state detectors High energy (wavelength) resolution - no filter or monochromator needed Gives high intensities, very low backgrounds Problem with "deadtime" High energy (wavelength) resolution - no filter or monochromator needed Gives high intensities, very low backgrounds Problem with "deadtime"

X-ray powder diffractometer Deadtime

X-ray powder diffractometer Deadtime

X-ray powder diffractometer Deadtime

X-ray powder diffractometer