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Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba_(3)Cu_(5)O_(8) (1:1.3) and YbBa_(2)Cu_(3)O_(y)

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 1048-1056页

作者： sushma miryala Masato Murakami Superconducting Material Laboratory Department of Material Science and EngineeringShibaura Institute of Technology3-7-5 ToyosuKoto-kuTokyo 135-8546Japan School of Engineering and Applied Science Princeton UniversityPrincetonNJ 08544United States

Utilization of novel materials,particularly high-T_(c)(critical temperature)superconductors,is essential to pursue the United Nations’Sustainable Goals,as well as to meet the increasing worldwide demand for clean and carbon-free electric power *** magnets are beneficial in several real-life applications including transportation,energy production,magnetic resonance imaging(MRI),and drug delivery *** achieve high performance,one must develop uniform,large-grain,infiltration-growth(IG)processed bulk YBa_(2)Cu_(3)O_(y)(Y-123)*** this study,we report the magnetic and microstructural properties of a large-grain,top-seeded,IG-processed Y-123 pellet,which is 20 mm in diameter and 6 mm in height;the pellet is produced utilizing liquid Yb-123+Ba_(3)Cu_(5)O_(8) as the liquid *** the samples cut from the top of the bulk exhibit a sharp superconducting transition(approximately 1 K wide)with the onset T_(c) of approximately 90 ***,in the samples cut from the bottom surface,the onset T_(c) values slightly decreased to between 88 and 90 K,although still exhibiting a sharp superconducting *** top and bottom samples exhibited the highest remnant value of J_(c)(critical current density)at 77 K H//c-axis of 50 and 55 kA/cm^(2),*** remnant J_(c) and irreversibility field values significantly fluctuated,being fairly low in some bottom *** electron microscopy identified nanometer size Y-211(Y2BaCuO5)secondary-phase particles dispersed in the Y-123 ***-dispersive spectroscopy clarified that the decreased both T_(c) and J_(c) for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.

关键词： infiltration growth special variation critical current density scanning electron microscopy

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Advancing sustainability:Magnesium-based solutions for environmental challenges and high-performance technologies in superconductivity

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Journal of Magnesium and Alloys 2024年第4期12卷 1257-1259页

作者： Muralidhar miryala Materials for Energy and Environmental Laboratory Shibaura Institute of Technology3-7-5 ToyosuKoto-KuTokyo 135-8548Japan

The Journal of Magnesium and Alloys(JMA)is actively dedicated to addressing crucial issues related to energy con-servation,emission reduction,energy crises,and sustainable development[1].Magnesium,recognized as the lightest com-mercial structural metal and a promising energy storage ma-terial,holds immense potential in contributing to strategic objectives such as achieving“carbon neutrality”and the“emission peak”,thus mitigating the ongoing energy cri-sis[2].JMA diligently reports on various research fronts,including magnesium-based structural materials,magnesium batteries,magnesium-based hydrogen storage materials,and magnesium-based superconducting super magnets[3].

关键词： magnesium holds structural

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Pinning Characteristics in a Single Crystal Nd-123 Superconductors at Low, Intermediate and High Temperatures Using Flux Creep-Flow Model

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Journal of Physical Science and Application 2012年第7期2卷 233-239页

作者： Mohammed Nasim Hasan Teruo Matsushita miryala Muralidhar Department of Physics University of Chittagong Chittagong 4331 Bangladesh Department of Computer Science and Electronics Kyushu Institute of Technology lizuka 820-8502 Japan Senior Scientific Officer Superconductivity Research Laboratory Tokyo 105-0023 Japan

The pinning characteristics of a single crystal NdBaaCu3Oy superconductor at low （40 K）, intermediate （77.3 K） and high （88 K） temperatures were investigated. The experimental results of the critical current density dc and the apparent pinning potential u o which estimated from magnetic relaxation measurements are compared with the theoretical analysis based on the flux creep-flow model, taking the distribution of the flux pinning strength into account. The number of flux lines in the flux bundle （g2）, the most probable value of pinning strength （Am）, distribution width of pinning strength （σ-2） and other pinning parameters such as m, γ,δ are determined so that a good fit is obtained between the experimental and theoretical results. The behavior of these parameters is discussed in correspondence to the pinning characteristics of low, intermediate and high temperatures. The observed results are approximately consistent with the theoretical predictions of Brandt et al. model of the order-disorder transition.

关键词： Nd-123 single crystal superconductor magnetic relaxation flux creep-flow model pinning characteristics.

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熔融织构(Nd-Eu-Gd)-Ba-Cu-O超导体的各向异性磁通跳跃及其不稳定性研究

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物理学报 2005年第5期54卷 2307-2312页

作者：池长昀张金仓李领伟刘芬黎文峰敬超曹世勋 miryala Muralidhar 姚忻上海大学物理系上海200436 Superconductivity Research Laboratory(SRL) ISTECJapan 上海交通大学物理系上海200436

对c轴择优取向的熔融织构样品 (Nd0 33Eu0 33Gd0 33)Ba2 Cu3O7-δ(含Gd(2 11)相 )的磁通跳跃现象进行了系统研究 .结果表明 ,在外加磁场平行于样品c轴条件下 ,在 2到 3K的温度范围内明显观测到了部分磁通跳跃现象 ,而在5K及以上温区... 详细信息

对c轴择优取向的熔融织构样品 (Nd0 33Eu0 33Gd0 33)Ba2 Cu3O7-δ(含Gd(2 11)相 )的磁通跳跃现象进行了系统研究 .结果表明 ,在外加磁场平行于样品c轴条件下 ,在 2到 3K的温度范围内明显观测到了部分磁通跳跃现象 ,而在5K及以上温区并未出现 .在磁场垂直于样品的c轴情况 ,在 2K到Tc 的整个温区都没有观察到磁通跳跃现象 .这种各向异性磁通跳跃现象可归因于各向异性钉扎力和几何退磁因子的结果 .随着温度的增加 ,磁通跳跃数目减少 ,且M(H)曲线的第三象限是磁通跳跃的最不稳定过程 .最后 ,研究了磁通跳跃对磁场扫描速率的依赖关系 ,并讨论了磁通蠕动对磁通跳跃的影响 .

关键词：超导体熔融织构各向异性磁通跳跃

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Processing and Characterization of Bulk FeSe

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Journal of Electrical Engineering 2016年第3期4卷 109-115页

作者： miryala Muralidhar Tomokazu Hanai Kouichi Furutani Pavel Diko Milos Jirsa Masato Murakami SRL Graduate School of Science and Engineering Shibaura Institute of Technology Tokyo 135-8548 Japan Institute of Experimental Physics SAS Watsonova 49 SK-04353 Kosice Slovak Republic Institute of Physics CAS Na Slovance 2 CZ-18221 Praha 8 Czech Republic

We investigated the effect of processing conditions on the structure and physical properties of the polycrystalline samples of Ca0.8Fe2Se2 prepared via solid state reaction. X-ray diffraction showed that the main phase became FeSe when the sintering temperature increased above 350 ℃. The temperature dependence of magnetization （M-T curves） recorded in zero-field-cooled mode by SQUID magnetometer showed some bumps at around 120 K to 140 K. These bumps moved to lower temperatures when the processing temperature increased above 550 ℃. On the other hand, pure FeSe materials produced at 900 ℃ for 24 h showed a sharp superconducting transition Tconset = 8.16 K and the critical current density of 6,252 A/cm2 at 5 K, self-field. SEM results indicated an enhanced grain connectivity.

关键词： Ca0.8Fe2Se2 FeSe X-ray diffraction magnetization measurements SEM EDX analysis.

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