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INFLUENCE OF GEOMETRICAL CONFIGURATION OFSUPERCONDUCTING MATERIAL ON GROWTH OF Nb_3 Sn
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作者 LUO Le HU Suhui 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1989年第8期114-121,共8页
Boundary conditions constructed by two typical geometrical configurations related to the manufacturing methods of bronze process and tin-rich Nb tube method have been considered in a diffusion model in which the diffu... Boundary conditions constructed by two typical geometrical configurations related to the manufacturing methods of bronze process and tin-rich Nb tube method have been considered in a diffusion model in which the diffusion of Sn in CuSn matrix plays a major role is as- sumed.The dependence of thickness of Nb_3Sn layer on reaction time has been derived.It is shown that the growth rate of Nb_3Sn relates to the configuration of the superconductor,the geometrical parameters of Nb filaments and CuSn matrix.The theory is qualitatively con- sistent with the experimental results. 展开更多
关键词 superconducting material Nb_3Sn geometrical configuration diffusion kenetics growth rate
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Early Studies of Superconductive Materials and Superconducting Magnet in China(1962~1966)
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作者 刘兵 王新荣 《Rare Metals》 SCIE EI CAS CSCD 1993年第3期232-236,共5页
On the basis of the published literature and the interviews with some participants,this paper introduces the early history of the studies of superconductive materials and superconducting magnet during 1962~ 1966 in C... On the basis of the published literature and the interviews with some participants,this paper introduces the early history of the studies of superconductive materials and superconducting magnet during 1962~ 1966 in China,narrates the achievements of other relevant experimental and theoretical studies of superconductivity in that period briefly,and tries to give the authors' comments on that history. 展开更多
关键词 History of Superconductive materials superconducting magnet
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Superconducting Magnetic Flux Transformer at 77K
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作者 Ren, Hongtao Xiao, Ling +1 位作者 He, Qing Li, Jiazhang 《Rare Metals》 SCIE EI CAS CSCD 1990年第1期68-68,共1页
Superconducting Quantum Interference Device (SQUID) magnetometer is a kind of magnetic flux sensor with high sensitivity, and therefore can be used in geological prospect and biomagnetic field etc.. But the SQUID magn... Superconducting Quantum Interference Device (SQUID) magnetometer is a kind of magnetic flux sensor with high sensitivity, and therefore can be used in geological prospect and biomagnetic field etc.. But the SQUID magnetometer used before has to be used at the temperature of 4.2K provided by liquid helium and thus its application is limited. Since the discovery of high Tc oxide superconductors, scientists have been trying hard to put the SQUID magnetometer into use at 77K. Recently, a new kind of high Tc superconducting magnetic flux transformer winded with one piece of BiPbSrCaCuO superconducting wire is produced. The magnetic flux transformer can be designed to be insensitive to both uniform fields and fields with a constant gradient. In this letter, the fabrication and the properties of the high Tc superconducting magnetic flux transformer is described. 展开更多
关键词 Ceramic materials superconducting superconducting Devices superconducting materials Magnetic Properties
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Observation of lateral long range order in superconducting FeTe thin films
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作者 李位勇 韩烨 +7 位作者 王焕华 曹立新 贾全杰 陈雨 姜晓明 董成 许波 赵柏儒 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第8期18-23,共6页
We find that the superconductivity in the thin films of the formerly believed non-superconducting parent compound FeTe is accompanied by an emergence of second order with a correlation length of 742 nm and 258 nm at 1... We find that the superconductivity in the thin films of the formerly believed non-superconducting parent compound FeTe is accompanied by an emergence of second order with a correlation length of 742 nm and 258 nm at 10 K and 300 K, respectively. The structural phase transition found in iron pnictide superconductors, in non-superconducting FeTe bulk samples, and in FeSe superconducting thin films is not observed in the superconducting FeTe thin films. The interplay between superconductivity and long range order may suggest the crucial role of competition between electronic localization and itinerancy which leads to strong quantum fluctuations in the FeTe system. 展开更多
关键词 superconducting materials surface phase transitions and critical phenomena superconducting films x-ray determination of structures
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High T_c HoBa_2Cu_3O_(7-δ) Thin Films Deposited on (100) Y_2O_3Stabilized ZrO_2 Substrates by Sputtering
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作者 彭正顺 杨秉川 +1 位作者 王小平 赵忠贤 《Rare Metals》 SCIE EI CAS CSCD 1995年第2期123-126,共4页
Thin films of superconductors HoBa_2Cu_3O_(7-δ)(HBCO) were prepared by DC-sputtering technique. The epi-taxial growth was controlled by the ratio of the oxygen pressure and Ar pressure (O_2/Ar) , the subetrate temper... Thin films of superconductors HoBa_2Cu_3O_(7-δ)(HBCO) were prepared by DC-sputtering technique. The epi-taxial growth was controlled by the ratio of the oxygen pressure and Ar pressure (O_2/Ar) , the subetrate temperature T_s and the distance of the target to subetrate. Thin films deposited under the optimum conditions (Po_2/P_(Ar)= 1:2 ; T_s=730℃) show a critical temlierature clase to 87K and a transition width less than 1K. X-raydiffraction analysis shows that the films are highiy c-axis oriented. Auger electron spectroscopy depth profilingdemonstrates Ho diffusion into the Zr(Y)O_2 subetrate owing to the Ho subetitution for Y. 展开更多
关键词 superconducting material HoBa_2Cu_3O_(7-δ) Thin film
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Review of some recent progress on materials science researches in China 被引量:5
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作者 TANG Mei GUO YingQing +4 位作者 YUAN Jie WEI Qin SUN ShuJun ZHOU Wei ZHANG Yue 《Science China Chemistry》 SCIE EI CAS 2012年第12期2497-2502,共6页
New materials have become one of the most important and fastest-growing industries all over the world.Important progress in materials science and technology has produced profound influences on the national economy,dai... New materials have become one of the most important and fastest-growing industries all over the world.Important progress in materials science and technology has produced profound influences on the national economy,daily life and national defense of our country.In this paper,we review the state of the art of materials science and technology in China,with emphasis on recent research focuses and advanced technology. 展开更多
关键词 NANO-materialS semiconductor materials superconducting materials CEMENT CERAMIC ALLOY intelligent materials
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Ferromagnetic half levitation of LK-99-like synthetic samples 被引量:1
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作者 Kaizhen Guo Yuan Li Shuang Jia 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2023年第10期114-120,共7页
We successfully synthesized polycrystalline LK-99-like ceramic samples with a solid-state-sintering method.Powder X-ray diffraction shows that the main contents are Pb_(10-x)Cu_(x)(PO_(4))_(6)O and Cu_(2)S,consistent ... We successfully synthesized polycrystalline LK-99-like ceramic samples with a solid-state-sintering method.Powder X-ray diffraction shows that the main contents are Pb_(10-x)Cu_(x)(PO_(4))_(6)O and Cu_(2)S,consistent with recent reports (arXiv:2307.12037;arXiv:2308.01192).In some small flaky fragments,we successfully observed“half levitation”atop a Nd_(2)Fe_(14)B magnet.Using magnetization measurements on such small pieces,as well as on a large piece which does not exhibit the half levitation,we show that the samples ubiquitously contain weak yet definitive soft ferromagnetic components.We argue that,together with the pronounced shape anisotropy of the small fragments,the soft ferromagnetism is sufficient to explain the observed half levitation in strong vertical magnetic fields.Our measurements do not indicate the presence of the Meissner effect,nor zero resistance,in our samples,leading us to believe that our samples do not exhibit superconductivity.The precise chemical composition and the physics behind the ferromagnetic component remain outstanding questions to be addressed in future research. 展开更多
关键词 superconducting materials FERROMAGNETISM magnetization curve
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31p NMR study of magnetic phase transitions of MnP single crystal under 2 GPa pressure
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作者 GuoZhi Fan Bo Zhao +2 位作者 Wei Wu Ping Zheng JianLin Luo 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第5期7-10,共4页
Superconductivity on the border of the long-range magnetic order has been discovered in Mn P under high pressures. In order to investigate the nature of the magnetic properties adjacent to the superconducting state, w... Superconductivity on the border of the long-range magnetic order has been discovered in Mn P under high pressures. In order to investigate the nature of the magnetic properties adjacent to the superconducting state, we performed zero-field 31 P NMR for Mn P single crystal under ambient and hydrostatic pressure of 2 GPa, respectively. Radio frequency power level was used to determine whether NMR signal originates from a helical state or not. When 2 GPa pressure was applied, the signal from helical state exists even above 160 K, while that from the ferromagnetic phase was not observed. Our NMR results indicate that the magnetic phase which is adjacent to the superconducting state is in a helical magnetic structure. 展开更多
关键词 superconducting materials magnetic phase transitions nuclear magnetic resonance MNP
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