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and the enhancing effects of the oxide strengthening phase on the iron-based alloy Fe-14Cr-3W-5Ti-3Y-2.2O (mass fraction, %) were studied by X-ray diffractometry, scanning electron microscopy, energy.... The precipitation phase grows and the microhardness decreases with increasing sintering temperature. Key words: iron-based superalloy; oxide precipitation phase; dispersion strengthening; TiH2; YH2; Fe2O3; TiY2O7......
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; Since Michel et al.discoveredsuperconductivity of the BiSrCuO system at20K,the work of synthesizing highTc superconductors without rare-earth byadding some elements other than rare-earthsin... BiPbSrCaCuO superconductors关键词:......
Bi系高温超导体中非公度调制结构相的空间群测定 周廉1,边为民2,朱溢眉3 (1.西北有色金属研究院,西安,710016;2.东北大学研究院,沈阳,110004;3.Brookhaven National Laboratory,Upton NY 11973,USA) 摘要:采用会聚束电子衍射(CBED)对Bi-2212相和Bi-2223相中具有非公度调制结构的超胞结构进行了测定. 测定结果表明:具有A型调制结构Bi-2212相超胞的点群是2mm,空间群是I2mm;具有B型调制结构Bi-2223 相超胞的点群是mmm,空间群是Ibmm.结合实验结果讨论了摇摆曲线对CBED图对称性的影响,并......
铜氧化物超导体中的缺陷,不均匀性和晶格失配的研究 李阳1 (1.北京科技大学材料物理系,北京,100083) 摘要:讨论了高温超导体中普遍存在的缺陷,不均匀性,晶格失配及其应力钉扎等问题. 由于氧化物超导体临界温度与无严重畸变且有足够载流子浓度的CuO2面有密切关联, 通过考察载流子浓度和相邻CuO2层数目对超导电性的影响, 提出"活性CuO2面"模型, 并在此基础上讨论了增加氧化物超导体的"活性CuO2面"的数目, 对进一步提高TC的重要意义. 在活性CuO2面模型的基础上, 探讨在近邻阳离子层中引入缺陷对实现更高TC的可能性. 关键词:稀土; 超导; 缺陷; 不均匀性; 晶格失配;......
) on the silver foil with texture {110}<211>. The transport currents measured for the films were (2~6) ×10 5?A/cm 2 at 77 K, 0T. Keyword: film of high temperature superconductors......
high compared with thefields reported in literatures. We propose that the occurrence of the PME may be dueto a phase transition of flux vortices in the superconductors. Key words:YBCO superconductor......
Synthesis and Study on Physical Properties for Magnetic Superconductor RESr2RuCu2O8 (RE=Gd and Eu) 方明虎1,崔玉建1,方明豹2,徐政2 (1.Department of Physics, Zhejiang University, Hangzhou 310027, China;2.College of Materials Science and Engineering, Tongji University, Shanghai 200092,China) Abstract:Single-phase magnetic superconductors RESr2RuCu2O8 (RE=Gd and Eu) were successfully synthesized......
Origin of USO X.G.Zheng1 (1.Department of Physics, Saga University, Saga 840-8502, Japan) 摘要: Till now a lot of unidentified ''room temperature superconductors'', some times mocked as USO... temperature.Therefore the fundamental ferroelectric and magnetic properties of CuO must be considered seriously in identifying a possible new superconductors. [全文内容正在添加中] ......
STUDY ON THE DEPENDENCE OF SUPERCONDUCTIVITY ON MICROSTRUCTURES FOR Ba-Y-Cu OXIDE MATERIALS崔万秋,邹云,陈丹平,何忆军,周晶摘 要:<正> Two kinds of ceramic superconductors of Ba-Y-Cu-O system in which the ratios of Ba:Y:Cu are equal to2:1:3 and 2:3:3,respectively,and two kinds ofceramic materials without superconductivity with thesame compositions were made.Their......