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首页> 外文期刊>Journal of Materials Research >Fabrication and characterization of large Nd-Ba-Cu-O grains prepared under low oxygen pressure
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Fabrication and characterization of large Nd-Ba-Cu-O grains prepared under low oxygen pressure

机译：低氧压力下制备的Nd-Ba-Cu-O大晶粒的制备与表征

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摘要

A large, single-grain Nd-Ba-Cu-O (NdBCO) composite consisting of superconducting NdBa_2Cu_3O_7-δ containing nonsuperconducting Nd_4Ba_2Cu_2O_10 Phase inclusions was fabricated up to 2 cm in diameter using a top-seeded melt-textured growth technique. A MgO single-crystal seed was used to provide a heterogeneous nucleation site at the center of a presintered pellet heated above its peritectic temperature and cooled continuously in a conventional tube furnace in reduced oxygen partial pressure. This process produces individual grains with the c axis oriented at ≈ l0' to the seed surface which, from vibrating-sample magnetization measurements, exhibit a pronounced peak effect in their magnetic moment over a wide temperature range (50-90 K) when the supercurrent flows in the a-b planes. A very high irreversibility field (>9 T at 77 K) is also observed in these grains for field applied both perpendicular and parallel to the crystallographic c axis which is significantly greater than that observed in good-quality melt-processed Y-Ba-Cu-O. These results underline the potential of NdBCO for high-field engineering applications.
机译：使用顶部种子熔融织构生长技术，制造了直径最大为2 cm的大单晶Nd-Ba-Cu-O（NdBCO）复合材料，该复合材料由含非超导Nd_4Ba_2Cu_2O_10相夹杂物的超导NdBa_2Cu_3O_7-δ组成。使用MgO单晶种在预烧结小球的中心提供异质形核位置，该小球加热到其包晶温度以上并在常规的管式炉中以降低的氧分压连续冷却。该过程产生的单个晶粒的c轴指向种子表面≈10'，通过振动样品的磁化强度测量，当超电流流过宽温度范围（50-90 K）时，它们的磁矩表现出明显的峰值效应。在腹肌平面中流动。在垂直和平行于晶体c轴施加的这些晶粒中，还观察到非常高的不可逆场（在77 K下> 9 T），该场明显大于在优质熔融加工的Y-Ba-Cu中观察到的场-O。这些结果强调了NdBCO在高场工程应用中的潜力。

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