Evidence of oxygen content heterogeneity in TSMTG YBa2Cu3O7 − δ/Y2BaCuO5 composites by micro-Raman spectrometry

Fabian Delorme (1, 2) , Jean-François Bardeau (3) , C. Harnois (1) , I. Monot-Laffez (4)

1 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)
3 LPEC - Laboratoire de physique de l'état condensé
4 GREMAN - UMR 7347 - GREMAN (matériaux, microélectronique, acoustique et nanotechnologies)

The homogeneity of the oxygen content of TSMTG-YBa2Cu3O7 − δ/Y2BaCuO5 composites has been investigated by micro-Raman spectrometry. The Y123 compound has been found to be very sensitive to the laser power, but a laser power of 0.04 mW has been shown to not to be harmful for the samples, even after 2 h of irradiation. Raman spectra have shown that the oxygen content of YBa2Cu3O7 − δ/Y2BaCuO5 ceramics is not homogeneous at the micrometer scale. In addition, no monotonic decrease of the oxygen content is observed from the periphery to the core of the sample, confirming that the oxygen uptake is not strictly controlled by a diffusion process.

Domains: Chemical Sciences; Material chemistry

Fabian Delorme, Jean-François Bardeau, C. Harnois, I. Monot-Laffez. Evidence of oxygen content heterogeneity in TSMTG YBa2Cu3O7 − δ/Y2BaCuO5 composites by micro-Raman spectrometry. Physica C: Superconductivity and its Applications, 2008, 468 (5), pp.388-393. ⟨10.1016/j.physc.2007.12.006⟩. ⟨hal-00644007⟩