Percolative current-pass and Young's modulus in superconducting YBa_2Cu_3O_(6+x), agglomerate

摘要

The elastic property of polycrystalline bodies is affected by various factors such as porosity, micro-cracks, texture and so on. A number of studies have reported the relation between elastic modulus and rnicropore fraction, and proposed empirical equations for the relation of elastic modulus and porosity [1-5]. Percolative conduction properties in electronic ceramic agglomerates such as gas sensors should be greatly affected by electronic current pass, depending on connectivity between neighbouring grains, pores and microcracks in the microstructure as well as directional texture. Microcrack population is significant in current-pass evolution in a brittle ceramic agglomerate when it is with low density. Young's modulus is related to these microstructural factors as well as to mechanical properties; however, there have been very few studies on the relation of electronic conduction properties with Young's modulus for percolative-conduction ceramic. In this work we discuss and report preliminary results on Young's modulus, bulk density and critical current density of superconducting YBa2Cii3O6+.v (YBC) ceramics.