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High-quality synthetic diamonds for the monochromator of synchrotron radiation beams

Synthetic diamond crystals for monochromators of synchrotron radiation beams were grown by temperature gradient method under high pressure and high temperature. Crystalline quality of the diamond was investigated by double-crystal X- ray rocking curve measurement, polarized optical microscopy and X-ray topography. FWHM of rocking curve of the crystal was found to be clearly correlate with macroscopic strain observed by polarized optical microscope. It was also found that large line defects in the crystals have a more significant influence on the FWHM than nitrogen impurity and plane defect. Most of line defects and nitrogen impurity could be removed by using high-quality seed and by adding nitrogen getter to metal solvent, respectively. Using this method, high-quality and large diamond-crystals of more than 9 mm, which is useful for the monochromator, could be obtained.