Statistical evaluation of the mechanical and flux trapping properties of standard and thin-wall EuBCO(Ag) bulk superconductors
Statistical evaluation of the mechanical and flux trapping properties of standard and thin-wall EuBCO(Ag) bulk superconductors
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标准和薄壁 EuBCO(Ag) 块体超导体的机械和通量捕获性能的统计评估
DOI：
10.1111/jace.19601
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发表时间：
2023
影响因子：
3.9
通讯作者：
Baumann J
中科院分区：
文献类型：
--
作者：
Baumann J
统计研究了19个EuBCO(Ag)和20个EuBCO(Ag)薄壁块体超导体的力学性能和磁通俘获性能，并与用巴西法和高场磁化观察到的YBCO的结果进行了比较。在相同的实验条件下，77℃时，EuBCO(Ag)和薄壁EuBCO(Ag)块体超导体的平均俘获场明显高于YBCO块体样品。然而，由于这两种材料的俘获场数据范围很广，在YBCO的最高俘获场和EuBCO(Ag)块体超导体的最低俘获场之间观察到了统计重叠。本研究中测量的所有EuBCO(Ag)块体材料的抗拉强度均高于YBCO块体单晶。然而，与YBCO不同的是，观察到在EuBCO(Ag)块体超导体中在熔融处理之前引入人工孔降低了单晶的平均抗拉强度。令人惊讶的是，尽管EuBCO(Ag)块体超导体具有优异的机械和磁通钉扎性能，但当暴露在高场下的低温下时，并没有表现出增强的性能。
The mechanical and flux trapping properties of 19 EuBCO(Ag) and 20 thin‐wall EuBCO(Ag) bulk superconductors were investigated statistically and compared to those observed for YBCO using Brazilian testing and high‐field magnetization. The average trapped fields of EuBCO(Ag) and thin‐wall EuBCO(Ag) bulk superconductors were significantly higher than those of YBCO bulk samples at 77 K measured under similar experimental conditions. However, due to the wide range of trapped field data for both materials, a statistical overlap was observed between the highest trapped fields observed for YBCO and the lowest values observed for EuBCO(Ag) bulk superconductors. All EuBCO(Ag) bulk materials measured in this study exhibit a superior tensile strength compared to YBCO bulk single grains. Unlike the case of YBCO, however, the introduction of artificial holes to EuBCO(Ag) bulk superconductors prior to melt processing was observed to decrease the average tensile strength of the single grain. Surprisingly, despite their superior mechanical and flux pinning properties, EuBCO(Ag) bulk superconductors do not exhibit enhanced performance when exposed to high fields at low temperatures.