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首页> 外文期刊>Materials Science and Engineering >Improved Magnetic Trapped Field In Thin-wall Ybco Single-domain Samples By High-pressure Oxygen Annealing
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Improved Magnetic Trapped Field In Thin-wall Ybco Single-domain Samples By High-pressure Oxygen Annealing

机译：高压氧气退火技术改善薄壁Ybco单畴样品中的磁陷阱场

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Oxygen high pressure (up to 16MPa) has been introduced in the oxygen-annealing step necessary to make the YBa_2Cu_3O_x phase superconducting (change x from 6 to about 7). It enables a displacement in the equilibrium phase diagram towards higher temperatures, which means the possibility to achieve the same final oxygen content as the one at low temperature, but with the benefit of higher diffusion rates. Initial development made on thin bars (1.5-3 mm thick) has confirmed the interest of using a high pressure of oxygen. TEM observations have shown an increase of twin density associated with higher JC. This is in agreement with other works claiming the possibility of higher jc by twin engineering, and more precisely by twin refinement while annealing at high temperature. We report the successful application of this process without any adjustment to so-called thin-wall single-domain samples. These samples are obtained by growing a crystal on a pellet already shaped with an array of holes. The advantage is that, as far as diffusion processes are concerned, the typical length is not anymore the diameter of the sample, but the thickness of the walls between holes. The trapped field of 16 mm diameter Y123 thin-wall single-domain samples was doubled (0.6T vs. 0.3 Tat 77 K) in a rather short annealing time (about 3 days). Microstructures as well as magneto-optical observations of plain and thin-wall samples evidenced a reduction of cracks in the thin-wall samples. Improved performances were confirmed by further characterizations performed from 77 down to 20 K using the pulse-field facilities of the LNCMP at Toulouse.
机译：为了使YBa_2Cu_3O_x相超导（将x从6变为约7），在氧退火步骤中已引入了高压氧（最高16MPa）。它使平衡相图中的位移向更高的温度移动，这意味着有可能在低温下获得与最终氧相同的最终氧含量，但受益于更高的扩散速率。在细条（1.5-3毫米厚）上进行的初步开发证实了使用高压氧气的兴趣。 TEM观察表明，与更高的JC相关的孪晶密度增加。这与其他声称通过双晶工程提高jc的可能性是一致的，更确切地说是通过在高温退火时双晶精炼来提高jc的可能性。我们报告了此过程的成功应用，无需对所谓的薄壁单域样品进行任何调整。这些样品是通过在已形成孔阵列的颗粒上生长晶体来获得的。优点是，就扩散过程而言，典型的长度不再是样品的直径，而是孔之间壁的厚度。在相当短的退火时间（约3天）内，将直径为16 mm的Y123薄壁单畴样品的俘获场加倍（0.6T对0.3 Tat 77 K）。普通和薄壁样品的微观结构以及磁光观测表明，薄壁样品中的裂纹减少了。通过使用图卢兹LNCMP的脉冲场设备在77至20 K范围内进行的进一步表征，证实了性能的提高。

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