Does the pelletization pressure modify the effective anisotropy of the grains in (Bi,Pb)2223 bulk system?

Does the pelletization pressure modify the effective anisotropy of the grains in (Bi,Pb)2223 bulk... In this paper we present a new method to determine separately inter and intragranular magnitudes of polycrystalline superconducting materials, such as: intrinsic effective anisotropy, $$t=\rho _c/\rho _{ab}$$ t = ρ c / ρ a b , the slope of the linear part in the temperature dependence of the ab-planes resistivity, $$A_{ab}=\Delta \rho _{ab}/\Delta T$$ A a b = Δ ρ a b / Δ T , the weak links resistivity, $$\rho _{wl}$$ ρ w l , and the orientation probability of the grains’ a-axes along a certain preferential direction, $$\gamma _{xa}$$ γ x a . Here, $$\rho _{ab}$$ ρ a b , $$\rho _{c}$$ ρ c and T are the main values of the resistivitity tensor and the measurement temperature, respectively. The application of the method, illustrated by two (Bi,Pb)2223 polycrystalline samples, allows comparing the parameters obtained for the grains with those reported in single crystals. Moreover, we have demonstrated that different compacting pressures in the fabrication of the pellets change not only the inter, but also the intragranular properties of the ceramics. The method could be used to follow the different steps during the synthesis of polycrystalline high $$T_{c}$$ T c superconductors in order to optimise the process. Journal of Materials Science: Materials in Electronics Springer Journals

Does the pelletization pressure modify the effective anisotropy of the grains in (Bi,Pb)2223 bulk system?

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Springer US
Copyright © 2017 by Springer Science+Business Media New York
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
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