Effects of superconducting parameters of SnO2 nanoparticles addition on (Bi, Pb)-2223 phase
Effects of superconducting parameters of SnO2 nanoparticles addition on (Bi, Pb)-2223 phase
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SnO2纳米颗粒添加对(Bi,Pb)-2223相超导参数的影响
DOI：
10.1007/s10854-016-4327-6
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
K. Kocabaş
中科院分区：
文献类型：
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作者：
S. Yavuz;Özlem Bilgili;K. Kocabaş
本工作采用传统的固相反应法制备了掺入纳米SnO2的Bi1.7−xPb0.3SnxSr2Ca2Cu3Oy(x=0.00-0.20)样品。用X射线粉末衍射仪对样品的相组成、体积分数和晶格参数进行了表征。用扫描电子显微镜(SEM)对样品的表面形貌和颗粒连通性进行了表征。用交流磁化率测量方法测定了SnO2掺杂样品的抗磁起始温度(Tcon)和空穴浓度(P)。交流磁化率测量表明，样品Sn0(x0=0.00)、Sn1(x0=0.05)、Sn2(x10=0.10)、Sn3(x10=0.15)和Sn4(x10=0.20)的抗磁起始温度分别为108.559、109.985、101.281、101.670和92.676 kK。扫描电子显微镜测量表明，随着锡加入量的增加，样品的表面形貌和颗粒连通性降低，颗粒尺寸减小。此外，SnO2纳米颗粒的加入增加了杂质、空洞和孔隙率。所有样品的X射线衍射图表明，大部分样品为Bi2223和Bi2212相，并有少量的杂质相Ca2PbO4。当SnO2含量x=0.10时，Bi2223相的体积分数最高(49.49)，并且随着SnO2的进一步增加，Bi2223相的体积分数减小，而Bi2212相的体积分数增加。所有添加SnO2纳米颗粒的样品与未添加SnO2纳米颗粒的样品相比，晶格参数非常接近。这些结果表明，纳米SnO2对晶格参数没有显著影响。
In this work, nano-SnO2(<100 nm) added samples in Bi1.7−xPb0.3SnxSr2Ca2Cu3Oy(x = 0.00–0.20) were prepared by conventional solid-state reaction method. The phase formation, volume fraction and lattice parameters were characterized using X-ray powder diffraction measurements. Surface morphology and grain connectivity of the samples were identified by using scanning electron microscope (SEM). Diamagnetic onset temperatures (Tcon) and hole concentration (p) of SnO2added samples were determined by ac susceptibiliy measurements. AC susceptibility measurements showed that diamagnetic onset temperatures (Tcon) of samples Sn0 (x = 0.00), Sn1 (x = 0.05), Sn2 (x = 0.10), Sn3 (x = 0.15) and Sn4 (x = 0.20) are 108.559, 109.985, 101.281, 101.670 and 92.676 K, respectively. SEM measurements showed that not only the surface morphology and grain connectivity degrade but also the grain size of the samples decrease with the increase of the Sn addition. Also, addition of SnO2nanoparticles increases the impurities, voids and porosity. X-ray diffraction patterns of all samples indicated the majority of Bi-2223 and Bi-2212 phases along with minor impurity phase Ca2PbO4. The volume fraction of the Bi-2223 phase for the sample with x = 0.10 SnO2showed the highest percentage (49.49) and with further increasing SnO2, the volume fraction of the Bi-2223 phase decreases and Bi-2212 phase increases. All SnO2nanoparticles added samples showed quite similar lattice parameters compared with non-added sample. These results indicate that nano SnO2does not have significant impact on the lattice parameters.