GROWING DELTA-CRYSTALS OF POTASSIUM-RUBIDIUM BIPHTHALATE FROM AQUEOUS-SOLUTION

The crystals with a continuous change in lattice constants (delta-crys tals) can be used in X-ray optics since they are able to change the di vergence of X-ray beam. The samples of linear (one-dimensional) delta- crystals of potassium-rubidium biphthalate with the gradient of lattic e constant b up to 1%/cm have been grown from low-temperature aqueous solutions. X-ray diffraction study proved that quality of the crystals is high enough to provide the uniform reflectivity along the crystal surface and to allow the crystals to serve as a mirror for the divergi ng beam. After the required bending the crystals can be used as collec ting and amplifying monochromators.