Trial Fabrication of Practical High-Jc Superconductors by Neutron Irradiation Method

中子辐照法试制实用高Jc超导体

• 批准号: 11558061
• 负责人: TERAI Takayuki
• 金额: $ 8.83万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11558061/
• 关键词: high-Tc oxide superconductor; neutron; critical current density; pinning potential; anneal; induced radioactivity; uranium doping; bulk; 高温超伝導; 臨海電流密度; 原子炉; ピン止め; ウラン; 磁束; 高温酸化物超伝導体; 中性子照射; 照射欠陥; ピン止め中心

This study aimed to increase the critical current density Jc of high-Tc conductors to the level for practical application with fast-neutron irradiation or thermal-neutron irradiation after uranium doping. We irradiated Bi-2212 single crystal specimens and Y-123 bulk specimens fabricated by melt-growth process with fast neutrons in YAYOI reactor, University of Tokyo, JMTR & JRR-3, JAERI and measured the change in superconducting properties due to irradiation. Very large enhancement in Jc and pinning potential for the specimens irradiated with the order of 10^<17> n/cm^2 were observed. Thermal annealing also much increased Jc and pinning potential for heavily irradiated specimens at 673K.We also evaluated the induced radioactivities of the materials and uranium-doped Y-123. Most of the radioactivity came from the impurities in the materials. It is concluded that decrease of radioactivity is possible by decreasing some impurities including Zn, Co, etc, and kg level of the materials can be improved in superconducting properties for practical use in spite of the radioactivity.

本研究的目的是提高临界电流密度Jc的高Tc导体的实际应用水平与快中子辐照或热中子辐照后，铀掺杂。我们用快中子辐照东京大学YAYOI反应堆、JMTR & JRR-3、JAERI的Bi-2212单晶样品和Y-123块体样品，测量了辐照引起的超导性能变化。在10^ n/cm ^2量级的辐照下，观察到样品的Jc和钉扎电位有很大的增强<17>。热退火也显著提高了673 K强辐照样品的Jc和钉扎电位。大部分放射性来自材料中的杂质。结果表明，通过减少Zn、Co等杂质的含量，可以降低材料的放射性，而kg级材料的超导性能可以得到改善，从而使材料的实用化。

项目成果

Makito Nakano, Kouji Ogikubo, Takayuki Terai, Michio Yamawakia, Taiji Hoshiya: "Activation of High-Tc Superconductors with Neutron Irradiation"Physica C. 378-381. 270-272 (2002)

Makito Nakano、Kouji Ogikubo、Takayuki Terai、Michio Yamawakia、Taiji Hoshiya：“用中子辐照激活高温超导体”Physica C. 378-381。

K.Ogikubo, et al.: "Pinning Property Change of High-energy Heavy-ion Irradiated Bi_2Sr_2CaCuO_8+x Single Crystals due to Annealing"Physica C. 357-362. 280-283 (2001)

K.Ogikubo 等人：“由于退火引起的高能重离子辐照 Bi_2Sr_2CaCuO_8 x 单晶的钉扎特性变化”Physica C. 357-362。

N.Chikumoto et al.: "Comparative study of the plagnetization Behavior of the Heavy-ion Irradiated and the Neutron-irradiated RE123"Physica B. 284-288. 875-876 (2000)

N.Chikumoto 等人：“重离子辐照和中子辐照 RE123 的磁化行为的比较研究”Physica B. 284-288。

K.Ogikubo et al.: "Enhancement of Criutical Current Density of Bi-2212 Single Crystals by Neutron Irradiation Followed by Thermal Annealing"Physica C. 341-348. 1469-1470 (2000)

K.Ogikubo 等人：“通过中子辐照和热退火提高 Bi-2212 单晶的临界电流密度”Physica C. 341-348。

荻窪,内田,寺井 他: "Kr^<20+>イオン照射および照射後熱アニールによるBi_2Sr_2Ca( )_<8+x>高温酸化物超伝導体単結晶の超伝導特性変化"東京大学工学部総合試験所年報. 59. 91-95 (2000)

Ogikubo、Uchida、Terai 等人：“Kr^<20+> 离子辐照和辐照后热退火导致 Bi_2Sr_2Ca( )_<8+x> 高温氧化物超导体单晶超导性能的变化”东京工学院综合考试年度报告。 59. 91-95 (2000)