Microstructural and electrical characterization of bulk YBa2Cu3O7−δ ceramics

S. Suasmoro; M.F. Khalfi; A. Khalfi; Gilles Trolliard; David Stanley Smith; Jean-Pierre Bonnet

Microstructural and electrical characterization of bulk YBa2Cu3O7−δ ceramics

S. Suasmoro ¹ M.F. Khalfi ² A. Khalfi ^{2, *} Gilles Trolliard ³ David Stanley Smith ¹ Jean-Pierre Bonnet ¹

* Auteur correspondant

1 GEMH - Groupe d'Etudes des Matériaux Hétérogènes

2 Université Djillali Liabes [Sidi Bel Abbès]

3 SPCTS-AXE3 - Axe 3 : organisation structurale multiéchelle des matériaux

SPCTS - Science des Procédés Céramiques et de Traitements de Surface

Abstract : The value of critical current density at 77 K in “zero” applied field (Jc) characterizing the superconducting state for YBa2Cu3O7−δ ceramics is closely related to the microstructure. The interrelationships between the microstructural factors such as pore volume fraction, oxygen content, average grain size, are complex. However, these factors also influence the normal state resistivity measured at room temperature (ρ300). We demonstrate how the current carrying cross section influences Jc and ρ300 in a similar way. Data, reported for two classes of YBa2Cu3O7−δ: small grain porous ceramics and larger-grain denser ceramics, reveal an approximate linear relation between ρ300 K and Jc. Extrapolation of this relation to a fully dense small grain YBa2Cu3O7−δ ceramic yields values of ρ300 = 0.4 mΩ cm and Jc = 103 A cm−2.

Keywords : Superconductor YBa2Cu3O7−δ Synthesis Porous ceramic-limited grain growth Field Conductivity Microcracks Critical Current Magnetic A. Sintering

Type de document :

Article dans une revue

Domaine :

Chimie / Matériaux

Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-01116490
Contributeur : Fabrice Rossignol <>
Soumis le : vendredi 13 février 2015 - 15:11:50
Dernière modification le : mercredi 14 février 2018 - 16:21:45

Microstructural and electrical characterization of bulk YBa2Cu3O7−δ ceramics

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