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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigation of some physical properties of Gd added Bi-2223 superconductors
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Investigation of some physical properties of Gd added Bi-2223 superconductors

机译：Gd添加Bi-2223超导体某些物理性质的研究。

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X-ray powder diffraction (XRD), scanning electron microscopy (SEM), dc electrical resistivity, critical current density and static microindentation measurements are performed to investigate some physical properties of Bi_(1.8)Pb_(0.35)Sr_(1.9)Ca_(2.1) ] Cu_3Gd_xO_y superconducting samples with x = 0.0,0.1,0.3 and 0.5. We observe from the transport measurements that, for the Gd added sample, the critical transition temperature (T_c) and the critical current density (J_c) are decreased in comparison with that of undoped sample. In addition, surface morphology and grain connectivity of the samples are degraded and the high-T_c phase of the samples decreases with increasing Gd addition. The indentation load versus diagonal length of the samples under different indentation loads in the range of 0.245-2.940 N are measured. The microindentation measurements showed that, for the Gd added sample, the load dependent (apparent) microhardness value (H_v) is lower in comparison with that of the pure sample (x = 0). The values of H_v are found to be load dependent. In addition, we extract the load independent (true) microhardness using the Kick's law, proportional specimen resistance (PSR), modified proportional specimen resistance (MPSR) and the Hays-Kendall (HK) approach and compare the true hardness with the apparent hardness. The possible reasons for the observed degradation in microstructure, superconducting and mechanical properties due to Gd addition are discussed.
机译：进行了X射线粉末衍射（XRD），扫描电子显微镜（SEM），直流电阻率，临界电流密度和静态显微压痕测量，以研究Bi_（1.8）Pb_（0.35）Sr_（1.9）Ca_（2.1）的一些物理性质。 ）] x = 0.0、0.1、0.3和0.5的Cu_3Gd_xO_y超导样品。从传输测量中我们观察到，与未掺杂的样品相比，添加了Gd的样品的临界转变温度（T_c）和临界电流密度（J_c）降低了。此外，样品的表面形态和晶粒连通性降低，并且样品的高T_c相随Gd添加量的增加而降低。测量了在0.245-2.940 N范围内的不同压痕载荷下样品的压痕载荷与对角线长度。显微压痕测量表明，对于添加Gd的样品，与载荷有关的（表观）显微硬度值（H_v）低于纯样品（x = 0）。发现H_v的值与负载有关。此外，我们使用Kick定律，比例试样电阻（PSR），修正比例试样电阻（MPSR）和Hays-Kendall（HK）方法提取与载荷无关的（真实）显微硬度，并将真实硬度与表观硬度进行比较。讨论了由于添加Gd导致观察到的微观结构，超导和机械性能下降的可能原因。

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