Recently, novel low cost techniques have been employed to improve critical current density of MgB₂. Ultra-sonication is one such technique. We report on the influence of hexane dispersant on particle size of ultra-sonicated cheap commercial boron and the superconducting properties of MgB₂ bulks prepared using this new precursor. XRD showed major peaks corresponding to MgB₂, with small fractions of MgO and unreacted Mg. T_c was close to 39 K, with a sharp transition. The highest J_c was found in the sample with boron ultra-sonicated for 30 min as high as 375, 328, and 270 kA/cm² at 10, 15, and 20 K, respectively. SEM analysis revealed tiny particles and layers randomly dispersed in the microstructure, while EDX indicated that these particles were secondary phases of Mg, B, and O. Flux pinning diagrams showed the peak of normalized pinning force located close to b = 0.2, depicting dominance of grain boundary pinning mechanism.

近来，已经采用新颖的低成本技术来改善MgB _2的临界电流密度。超声波就是这样一种技术。我们报告了己烷分散剂对超声波廉价廉价硼的颗粒尺寸的影响，以及使用这种新前体制备的MgB ₂块的超导性能。XRD显示出对应于MgB _2的主要峰，少量的MgO和未反应的Mg。T _c接近39 K，有一个急剧的转变。在超声处理30分钟的硼中发现的最高J _c高达375、328和270 kA / cm ²分别为10、15和20K。扫描电镜分析显示微小的颗粒和随机散布在微观结构中的层，而EDX表示这些颗粒是Mg，B和O的次生相。助熔钉扎图显示归一化钉扎力的峰值位于b  = 0.2附近，说明了钉扎力的主导地位。晶界钉扎机制。