INTERGROWTH STRUCTURES OF YBA(2)CU(3)O(X) SINGLE-CRYSTALS WITH OXYGENINHOMOGENEITY

The diffraction pattern simulation of four YBa2Cu3Ox single crystals w ith inhomogeneous distribution was successfully carried out on the bas e of the theory of X-ray diffraction by disordered interstratified str uctures. The specific feature of their two-component irregular mixed-l ayered structures is the total segregation of layers with various oxyg en content that led to the formation of so-called intergrowth structur es. The concentration of admixture layers varied from 10 to 40% while oxygen content difference within the crystal ranged from 0.5 to 0.3. I n one of the crystals the fluctutations of layer heights corresponded to oxygen variation from 6.2 to 7.0.