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过冷度对新TSIG法单畴SmBCO超导块材性能的影响
发表时间：2015-08-15 浏览量：1770 下载量：536
| 全部作者： | 李强，杨万民 |
| 作者单位： | 陕西师范大学物理学与信息技术学院 |
| 摘 要： | 为降低Sm1+xBa2-xCu3Oy晶体中的固溶度x，以（Sm2O3+1.2BaCuO2）为新固相源，通过等温生长和淬火相结合的方法，研究过冷度对新顶部籽晶熔渗法（top seeded infiltration and growth process，TSIG）单畴SmBCO超导块材生长规律、显微组织及超导性能的影响。结果表明：随着过冷度的增加，SmBCO超导块材的生长速率逐渐增加，但过冷度太大时样品的生长速率则会下降；SmBCO超导块材中捕获的Sm211粒子的平均粒径减小；样品的起始超导转变温度逐渐下降，转变宽度逐渐变大；样品的临界电流密度逐渐增加。这些结果说明，采用新固相源TSIG法，可以有效抑制Sm3+/Ba2+替代，提高样品的物理性能；其结果对制备高质量SmBCO超导块材具有重要的指导意义。 |
| 关 键 词： | 凝聚态物理；SmBCO超导块材；顶部籽晶熔渗生长；过冷度；超导转变温度；临界电流密度 |
| Title： | Effects of supercooling degree on performances of single-domain SmBCO superconductor prepared by new TSIG process |
| Author： | LI Qiang, YANG Wanmin |
| Organization： | College of Physics and Information Technology, Shaanxi Normal University |
| Abstract： | In order to reduce the solid solubility x in the (Sm1+xBa2-xCu3Oy) crystals, we provide a new method to fabricate single-domain SmBCO superconductors by top seeded infiltration and growth process (TSIG) with (Sm2O3+1.2BaCuO2) as new solid phase. The effects of the supercooling degree on the crystal growth dynamics, microstructures and properties of the SmBCO bulks are also investigated. The results show that the growth rate of the SmBCO crystal increases gradually with the increase of the supercolling degree at first, but decreases when the supercooling degree is too high; the higher the supercooling degree, the smaller the average size of Sm211 particles captured in the SmBCO bulks; the lower the onset superconducting transition temperature, the wider the transition temperature width, and the higher the critical current density. These results indicate that the physical properties of SmBCO bulks can be greatly improved by this new method because of the greatly reduced Sm3+/Ba2+ substitution during the TSIG process, which provides an important new way for the fabrication of high-quality SmBCO superconductors. |
| Key words： | condensed matter physics; SmBCO bulk superconductor; top seeded infiltration and growth; supercooling degree; superconducting transition temperature; critical current density |
| 发表期数： | 2015年8月第15期 |
| 引用格式： | 李强，杨万民. 过冷度对新TSIG法单畴SmBCO超导块材性能的影响[J]. 中国科技论文在线精品论文，2015，8（15）：1601-1607. |
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