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Article Dans Une Revue Journal of Solid State Chemistry Année : 2006

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

Résumé

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 x≈0.4 for Bi2Sr2Ca1−xYxCu2O8+δ and at x′≈0.36 for Bi2Sr2Ca1−xYxCu1.94Zn0.06O8+δ, which can be also correlated to the defects. Oppositely to the metallic behaviour, which satisfies the Mathiessen's rule, the semiconducting one can be modelled by a variable range hopping process.

Dates et versions

hal-00110240 , version 1 (26-10-2006)

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Citer

C. Autret-Lambert, B. Pignon, M. Gervais, I. Monot-Laffez, A. Ruyter, et al.. Microstructural and transport properties in substituted Bi2Sr2CaCu2O8+δ-modulated compounds. Journal of Solid State Chemistry, 2006, vol. 179, n° 6, p. 1698-1706. ⟨10.1016/j.jssc.2006.03.005⟩. ⟨hal-00110240⟩
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