Abstract The solid-state reactions technique is considered as one of the most important and useful methods adopted to prepare the superconductors ceramics samples. This method was used in the current work to prepare Bi1.7Pb0.3Sr2W0.2Ca2Cu3O10+δ samples, with different pelletization pressures ranged between 0.2 and 1.0 GPa sintered at 850 °C for 140 h. WO3 nanoparticles were added to the BSCCO system with 0.2% in order to improve the connectivity between the grain boundaries and then to increase the dc electrical resistivity and oxygen content. X-ray diffraction, SEM and Vickers microhardness measurements were adopted to characterize the samples. Considering the electrical, structural affected by high pelletization pressure. Both of the critical temperature TC and oxygen content δ were enhanced dramatically at different pressures, so they reach to the optimum values of 130 K and 0.224 respectively, at a pressure of 0.4 GPa. The orthorhombic crystal structure has been seen by the XRD analysis which presented both high Bi-(2223) and low Bi-(2212) phases that exist in the samples. SEM showed common microstructures and features of plates-like grains that were randomly distributed across all samples. On the other hand, the mechanical properties were noticed to be improved with increasing the pressure from 0.2 to 0.8 GPa. The microhardness, Young modulus and yield strength demonstrated a drop when the pressure was increased up to 1.0 GPa.

中文翻译：

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Bi1.7Pb0.3Sr2W0.2 Ca2Cu3 O10+δ超导体体系的合成表征及造粒压力对性能的影响

摘要 固态反应技术被认为是制备超导体陶瓷样品最重要和最有用的方法之一。在目前的工作中，该方法用于制备 Bi1.7Pb0.3Sr2W0.2Ca2Cu3O10+δ 样品，不同的造粒压力介于 0.2 和 1.0 GPa 之间，在 850 °C 下烧结 140 小时。将 0.2% 的 WO3 纳米粒子添加到 BSCCO 系统中，以改善晶界之间的连接性，然后增加直流电阻率和氧含量。采用 X 射线衍射、SEM 和维氏显微硬度测量来表征样品。考虑到高造粒压力对电气、结构的影响。临界温度 TC 和氧含量 δ 在不同压力下均显着提高，因此它们在 0.4 GPa 的压力下分别达到 130 K 和 0.224 的最佳值。通过 XRD 分析已经看到正交晶体结构，其呈现出样品中存在的高 Bi-(2223) 和低 Bi-(2212) 相。SEM 显示了随机分布在所有样品中的板状晶粒的常见微观结构和特征。另一方面，随着压力从 0.2 GPa 增加到 0.8 GPa，机械性能得到改善。当压力增加到 1.0 GPa 时，显微硬度、杨氏模量和屈服强度显示出下降。SEM 显示了随机分布在所有样品中的板状晶粒的常见微观结构和特征。另一方面，随着压力从 0.2 GPa 增加到 0.8 GPa，机械性能得到改善。当压力增加到 1.0 GPa 时，显微硬度、杨氏模量和屈服强度显示出下降。SEM 显示了随机分布在所有样品中的板状晶粒的常见微观结构和特征。另一方面，随着压力从 0.2 GPa 增加到 0.8 GPa，机械性能得到改善。当压力增加到 1.0 GPa 时，显微硬度、杨氏模量和屈服强度显示出下降。