Simultaneous Cation-Substitution Effects on Superconducting Properties of Sm-Ba-Cu Oxide Superconductors

同时阳离子取代对 Sm-Ba-Cu 氧化物超导体超导性能的影响

基本信息

批准号：
08455299
负责人：
YAMAUCHI Hisao
金额：
$ 4.74万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455299/
关键词：
Sm-123 Y-123 Superconductivity Critical current density Peak effect Oxygen depleted region Twin boundary Pinning effect 酸素欠損ピン止め中心磁束ピン止め相分離

项目摘要

Cation-stoichiometric is SmBa_2Cu_3O_<7-d>(Sm-123) samples were synthesized to exclude contribution of pinning at particles of cation-nonstoichiometric phases and second phases to peak effect of J_c The samples were annealed in different conditions and had various oxygen contents. From results of Raman scattering, powder x-ray diffractometry and Rietveld analysis, cation-stoichiometric Sm-123 samples were successfully obtained. A Sm-123 sample with oxygen content, 7-d,=6.84 exhibited peak effect and its J_c value at 77 K and 1 T was 10kA/cm^2. On the other hand, samples with 7-d=6.89 and 6.95 did not exhibit the peak effect Contrary to the previous reports, it was concluded that oxygen depleted regions would work for the pinning to exhibit the peak effect in Sm-123 superconductors.A novel transmission electron microscopy technique termed as large area high-resolution transmission electron microscopy(LA_HRTEM) was developed to identyfy unknown origin of the peak effect in Y-Ba-Cu-O supe … More rconducting bulks. A specimen fabrication method was also developed for energy dispersive x-ray analyses in LA-HRTEM observations. Superconducting bulks of Y-Ba-Cu-O were synthesized by a melt growth technique under varied oxygen partial pressure. Distributions of grain sizes for Y_2BaCuO-(Y-211) particles and inter-twin-boundary-distances were measured utilizing LA-HRTEM. Area of the interface between the Y-211 particles and the Y-123 matrix was found to be proportional to the J_c value at low magntic fields. On the other hand, the inter-twin-boundary-distance was inversely proportional to the J_c value at high magnetic fields. From these results, oxygen depleted regions in the vicinity of the twin boundaies would work for pinning to exhibit the peak effect, while contribution of the interface between Y-211 particles and Y-123 matrix to the pinning for the appearance of the peak effect was very limited. A heat treatment program was developed to appear the peak effect reversively and confirmed the validity of the guiding principle for designing mateirals. Less

合成阳离化学计量学为SMBA_2CU_3O_ <7-D>（SM-123）样品，以排除固定阳离子 - 非施氏脉络化阶段的颗粒的贡献，而第二阶段对J_C的峰值效应对J_C的峰值效应，样品在不同的条件下被退出了不同的条件，并具有不同的氧气含量。从拉曼散射，粉末X射线衍射法和Rietveld分析的结果中，成功获得了阳离子化学计量学SM-123样品。具有氧含量，7-D，= 6.84的SM-123样品，在77 K和1 T时其J_C值为10KA/cm^2。另一方面，具有7-D = 6.89和6.95的样品并未表现出与先前报告相反的峰值效应，得出的结论是，氧气衍生的区域将用于固定的固定区域可在Sm-123超导体中表现出峰值效应。一种新型的透射电子显微镜技术，称为大面积透射传输电子显微镜（La_hrty to la_hrty to la_hhrty to la_hhrty in nake formenty）everalon Siperon Siptrocopy技术。 y-ba-cu-o supe…更多的造成散装。还开发了一种标本制造方法，用于在LA-HRTEM观测中进行能量分散X射线分析。 Y-BA-Cu-O的超导大部分是通过氧气部分压力下的熔体生长技术合成的。使用LA-HRTEM测量了Y_2BACUO-（Y-211）颗粒和双线距离距离的晶粒大小的分布。发现Y-211颗粒和Y-123基质之间的界面面积与低磁场处的J_C值成正比。另一方面，双线之间的距离与高磁场处的J_C值成反比。从这些结果中，双边界附近的氧脱离区域将用于固定以表现出峰值效应，而Y-211颗粒和Y-123矩阵之间界面的贡献非常有限。制定了一项热处理程序，以表现出峰值效应，并确认了指导原理设计男子的有效性。较少的

项目成果

期刊论文数量（35）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

“Large-Area TEM" Observation of the Distribution of Y-2 1 1 Particles in YBCO Superconductors Melt-Grown under Varying Oxygen Pressure

变氧压下熔融生长YBCO超导体中Y-2 1 1粒子分布的“大面积TEM”观察

DOI：
发表时间：
1998
期刊：
Advances in Superconductivity x 2
影响因子：
0
作者：
H. Suematsu;H. Okamura;S. Nagaya;H. Yamauchi
通讯作者：
H. Yamauchi

M.Kawano: "Oxygen-Content Dependence of Critical Current Density of SmBa_2Cu_3Oy Superconductrs" Appl.Superconductivity. (印刷中).

M. Kawano：“SmBa_2Cu_3Oy 超导体临界电流密度的氧含量依赖性”应用（正在出版）。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Peak Effect in Jc of the Cation-Stoichiometoric SmBa_2Cu_3O_y Superconductor

阳离子化学计量SmBa_2Cu_3O_y超导体的Jc峰值效应

DOI：
发表时间：
1997
期刊：
Appl. Superconductivity 5/(1-6)
影响因子：
0
作者：
M. Kawano;H. Suematsu;T. Onda;M. Hayakawa;H. Ogiwara;M. Karppinen;H. Yamauchi
通讯作者：
H. Yamauchi

Enhanced Pinning and Peak Effect in Overdoped (Hg, Pb)(Sr, Ba)_2Ca_2Cu_3O_<8+8> Superconductors

过掺杂 (Hg, Pb)(Sr, Ba)_2Ca_2Cu_3O_<8 8> 超导体中增强的钉扎效应和峰值效应