Microstructural and transport properties in substituted Bi2Sr2CaCu2O8+δ-modulated compounds

X-ray powder diffraction and resistivity measurements were performed on Bi2Sr2CaCu2O8+δ ceramics substituted by Y and Zn for Ca and Cu sites, respectively. X-ray diffraction patterns show an incommensurate modulated structure along the b-axis. The structural refinements were carried out using the four-dimensional space group Bbmb(0β1)0 0 0. From the X-ray peak profiles analysis, an anisotropic line-shape broadening was observed. The use of the “Williamson and Hall” method allows distinguishing the origin of broadening as mainly due to microstrains. A large transition from a metallic to semiconductor behaviour is observed on the resistivity curves at image for Bi2Sr2Ca1−xYxCu2O8+δ and at image for Bi2Sr2Ca1−xYxCu1.94Zn0.06O8+δ, which can be also correlated to the defects. Oppositely to the metallic behaviour, which satisfies the Mathiessenʹs rule, the semiconducting one can be modelled by a variable range hopping process.