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Details
From imperfect to perfect Bi2Sr2CaCu2Ox (Bi-2212) grains
| Author | Heeb, B.; Gauckler, L.J.; Heinrich, H.; Kostorz, G. | |
| Year | 1993 | |
| Type | Journal Article | |
| Journal | J. Mater. Res. | |
| Volume | 8 | |
| Issue | 9 | |
| Pages | 2170-2176 | |
| Date | 1993/9 | |
| Custom 1 | JA | |
| Custom 2 | SUPRA | |
| Abstract | The 2212 phase formation during annealing of melt textured Bi-2212 (Bi2Sr2CaCu2Ox) was investigated using differential thermal analysis, thermal gravimetric analysis, x-ray diffraction, scanning electron microscopy, energy dispersive x-ray analysis, and high resolution transmission electron microscopy. After zone melting, the material is multiphase consisting of 2212, 2201, Sr1-x CaxCuO2, and the eutectic. The 2212 phase formed is highly perfect with less than 5% intergrowths of 2201 layers; the 2201 phase shows no intergrowth of 2212 at all. In the first period of the annealing, remelting of the eutectic leads to fast oxygen diffusion and a high 2212 formation rate. The 2201 [Arrow Right] 2212 transformation proceeds via intermediate states of high defect density. The 2212 grains contain up to 30-70% 2201 intergrowths. Further heat treatments lead to an annihilation of the great majority of intergrown 2201 layers. We propose a model for the formation of 2212 grains with a low planar defect density, based on frequent stacking faults, that allows diffusion of Ca-and Cu-atoms over a short distance. The model provides a schematic description of this solid-state process and correlates it to the characteristic microstructural features of melt-processed Bi-2212. [Author abstract; 17 Refs; In English] | |
| URL | ||
| Record Number | 109 | |
| Group | nonmet |
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