Measurements of χ'(t) and χ"(t) have been performed on directionally solidified YBCO 211 doped samples. We analyze the variations of structural and superconducting properties as a function of a relevant fabrication parameter such as the pulling rate within a region with fixed, thermal gradient. Measurements are made at different AC magnetic field and frequencies. The effects of intra-and inter-domain screening currents are compared among samples with different superconducting properties. Although the XRD shows quasi-single crystal behaviour, residual granular-like effects are observed. However, in good quality samples the dissipation due to the inter-domains coupling is orders of magnitude lower than the dissipation in sintered specimens.
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