平成 28 年度 東北・北海道支部/第２回材料研究会 合同シンポジウム （東北・北海道支部だより）
In fiscal year 2016 the 「東北・北海道支部/第２回材料研究会 合同シンポジウム」(Tohoku and Hokkaido Branch / 2nd Materials Research Society Symposium) was held at The Toya Kanko Hotel (Toya Lake Onsen, Hokkaido) on August 2 and 3, 2016. This year the research theme was 「持続可能なエネルギー社会のための高性能超電導材料の開発動向」(Development trend of high-performance superconducting materials for a sustainable energy society). 10 lectures were carried out and participants were 19, including the lecturers.
The first day, after the greetings of Coordinator of Tohoku and Hokkaido Branch, Prof. Nakajima, 5 lectures were held. At first, the symposium started with a special exchange lecture from West Branch: Prof. Kaname Matsumoto (Kyushu Inst. Tech.) talked about「高温超伝導材料における臨界電流密度の最適化問題について」 (The optimization problem of the critical current density in high-temperature superconducting materials). He discussed the current status of critical currents (Jc) reached in different categories of superconducting materials (Nb-Ti, Nb3Sn, MgB2, SmFeAsOF, REBCO, Bi2223) in relation to the theoretical limit (the depairing current Jd). Through literature survey and his own TDGL calculation results, Prof. Matsumoto showed that there is room for improvement of Jc not only in MgB2, SmFeAsOF, and REBCO where Jc/Jd ~ 20%, but also in Nb3Sn and Bi2223 where Jc/Jd ~ 0.1%.
Second lecture 「単結晶基板及び金属基板上に作製したナノロッド導入REBCO 膜のJc 向上に関する最新研究」 (Latest research on nanorods-introduced REBCO films formed on single crystal substrates and metal substrates) was presented by Prof. Yutaka Yoshida (Nagoya University). He discussed extensively the current status of REBCO films prepared by pulsed laser deposition (PLD) with the addition of BaMO3 (M = Zr, Sn, Hf) nanorod-shaped artificial pinning centers (APCs). Marvelous results have been obtained in GdBCO-BHfO films with pinning force density FP of 23 GN/m3 (77K), 88 GN/m3 (65K) and 274 GN/m3 (40K) at 6T on IBAD tape and SmBCO-BaHfO3 with Fp ~ 1000 GN/m3 (4.2K). However, further research is required to clarify important points like the growth mechanism of the nanorods.
Third lecture 「ナノ粒子添加制御によるMOD-REBCO 薄膜におけるJc 向上」(Improvement of Jc in MOD REBCO films by control of nanoparticles addition) was presented by Prof. Masashi Miura (Seikei University). He showed how the metal organic deposition (MOD) route allowed to produce high-quality REBCO films added with BaMO3 nanoparticles with extraordinary performance even in length of 100m. Thanks to the introduction of controlled BaZrO3 with high density, superconducting performance have been maintained at 50K even under huge extremal applied field of 50T. This recently opened the path of commercialization of (Y,Gd)BCO+ BaZrO3 cable.
The fourth talk 「Bi2223 テープ開発の進展」 (progress in development of Bi2223 tapers) was delivered by Dr. Hitoshi Kitaguchi (NIMS). He described the progress and current status of Bi-2223 tapes produced by powder in tube (PIT) route from the point of view of development on carried current and mechanical strength. In Engineering current density Je = 250 A/mm2 have been obtained in commercial products and it is expected to further improve. Mechanical strength reached 400 MPa in reinforced commercial tape.
The fifth and final talk of the first day 「組織制御によるMgB2 線材の高性能化」 (High performance of round MgB2 cables though structural control) was presented by Dr. Hiroaki Kumakura (NIMS). MgB2 has several merits: low cost of elements and Jc not strongly affected by the grain boundaries (differently than for oxide supereconductors). Dr. Kumakura summarizes the progress in preparation of MgB2 cables by PIT method allowing production of batches which length of 100m. Several carbon additives have been tried to improve the Jc, and recently MgB2 added with coronene (annular molecule based on benzene rings, atomic formula C24H12) showed Jc = 1.3 105 A/cm2 and Je = 1.3 104 A cm2 (4.2K, 10T).
The first day continued with social gathering: relaxing with kaiseki-style dinner in the Japanese salon of the hotel (picture 1), followed by enjoying fireworks show on Toya Lake (picture 2). Returning to the hotel, volunteers carried out night breakout session discussing - with fundamental help of delicious Hokkaido beer and sake - the future of superconductivity.
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Pic. 1 – Group photo of Symposium attendees after the banquet |
Pic. 2 – Fireworks show on Toya Lake |
The second day started with seminar by Prof. Junichi Shimoyama (Aoyama Gakuin University), entitled 「高温超伝導材料応用の将来とポテンシャル」 (Future and potential of high-Tc Superconductors application). Prof. Shimoyama accomplished an extended review of high-Tc superconducting materials discovered in the last 30 years, focusing then on structure/properties relationship in BSCCO (tape), REBCO (tape and bulk) and Fe-based superconductors. He remarked how it is essential to develop ad hoc experimental techniques allowing the practical material development.
The second talk 「高圧合成技術を用いた新超伝導物質探索」 (Search of new superconducting materials using high-pressure synthesis technique) was done by Prof. Chihiro Sekine (Muroran Institute of Technology). High-pressure method allows synthetizing new substances not possible to obtain at rom pressure. By means of kawai-type two-stage multi-anvil apparatus, 19 new superconducting compounds belonging to the skutterudite-type structure have been discovered recently (6 of them in Prof. Sekine`s laboratory) with Tc varying in the range 0.74~17 K.
The third talk 「オキシプニクタイド超伝導薄膜: 作製と評価」 (Oxypnictide superconducting thin films: preparation and transport properties) was delivered by Prof. Kazumasa Iida (Nagoya University). He described the effect of manufacturing process on transport characteristics of NdFeAs(O, F) epitaxial thin film produced by molecular beam epitaxy (MBE route). Highlights of the research are the observation of staircase structure and lock-in phenomenon and the increase of Jc anisotropy with decreasing temperature.
The fourth talk 「鉄系超伝導材料の超伝導と物理特性」 (Superconductivity and physical properties of iron-based superconducting material) was carried on by Prof. Yoshihiko Takano (NIMS). He focused on the Fe-based superconductor with the simplest structure, FeSe. First topic shown was the route to increase Tc from 10K to 37K under high pressure (6GPa) in diamond anvil-cell, also showing how, using newly developed anvil cell with diamond electrodes; it was possible to monitor the variation of Tc with pressure. Second topic was the low-cost synthesis of long FeSe wire through electrochemical route.
The fifth and conclusive talk of the second day 「高磁場応用に向けたMgB2 と鉄系超伝導材料の基礎開発」 (Basic development of MgB2 and Fe-based superconducting materials for high magnetic field applications) was given by Prof. Akiyasu Yamamoto (Tokyo University of Agricolture and Technology). He summarized the in-field behaviour of polycrystalline MgB2 and Ba(Fe,Co)2As2 showing in detail the dependence from synthesis conditions, structure and morphology. Both categories of superconductors revealed their potential for applications in strong magnetic fields and temperatures higher than 4.2K. For example, conventionally sintered MgB2 showed trapped magnetic field of 5 T at 7 K..
The Symposium was closed with the remarks of Materials Research Society Chairman, Prof. Yoshida. Both days of the symposium were extremely satisfactory with exhaustive talks and lively discussion amongst attendees. The beautiful scenario of Toya Lake was very appreciated by attendants, finding a cool oasis to escape from the humid summer of rest of Japan. We are looking forward to meet old and new attendees and lecturers at the next edition of the Symposium, which will be probably held in Aomori prefecture in Summer 2017.
平成 28 年度 東北・北海道支部/第２回材料研究会合同シンポジウムのご案内
テーマ |
： | 持続可能なエネルギー社会のための高性能超電導材料の開発動向 |
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日 時 |
： | 2016年 8月 2日(火) ～ 3日(水) |
会 場 |
： | 洞爺観光ホテル（北海道虻田郡洞爺湖町洞爺湖温泉３３番地）http://www.toyakanko.com/ |
主 催 |
： | 低温工学・超電導学会 東北・北海道支部 |
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プログラム |
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【1日目】8月2日（火） |
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13:50 |
〜 |
13:55 |
開会の挨拶 |
東北・北海道支部長 |
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《西支部との交流による特別講演》 |
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13:55 |
〜 |
14:45 |
高温超伝導材料における臨界電流密度の最適化問題について |
松本 要（九工大） |
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14:45 |
〜 |
15:25 |
単結晶基板及び金属基板上に作製したナノロッド導入REBCO膜の Jc向上に関する最新研究 |
吉田 隆（名大） |
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15:25 |
〜 |
15:40 |
休憩 |
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15:40 |
〜 |
16:20 |
ナノ粒子添加制御によるMOD-REBCO薄膜におけるJc向上（仮） |
三浦正志（成蹊大） |
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16:20 |
〜 |
17:00 |
Bi2223テープ開発の進展（仮） |
北口 仁（NIMS） |
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17:00 |
〜 |
17:40 |
組織制御によるMgB2線材の高性能化 |
熊倉浩明（NIMS） |
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18:30 |
〜 |
20:30 |
夕食(懇親会) |
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【2日目】8月3日（水） |
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8:30 |
〜 |
9:20 |
高温超伝導材料応用の将来とポテンシャル |
下山淳一（青山学院大） |
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9:20 |
〜 |
10:00 |
高圧合成技術を用いた新超伝導物質探索 |
関根ちひろ（室工大） |
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10:00 |
〜 |
10:20 |
休憩 |
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10:20 |
〜 |
11:00 |
オキシプニクタイド超伝導薄膜の作製と評価 |
飯田和昌（名大） |
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11:00 |
〜 |
11:40 |
鉄系超伝導材料の超伝導と物理特性（仮） |
高野義彦（NIMS） |
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11:40 |
〜 |
12:20 |
強磁場応用のためのMgB2と鉄系超伝導材料（仮） |
山本明保（東京農工大） |
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12:20 |
〜 |
12:30 |
閉会の挨拶 |
材料研究会委員長 |
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参加費 |
： | 2,000円（資料代） |
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宿泊 |
： | 11,100円（1泊2食） |
交通 |
： | 洞爺観光ホテルHP（http://www.toyakanko.com/）参照 |
オーガナイザー |
： | Paolo MELE（室蘭工大）、淡路 智（東北大）、宮城大輔（東北大） |
申込方法
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： | 参加を希望される方は、氏名、所属、＜宿泊＞＜懇親会＞の有・無 を添えて7月1日までにE-mailで下記へお申し込みください。 |
申込・問合せ先 |
： | 東北大学 宮城大輔 E-mail: dmiyagi@ecei.tohoku.ac.jp Tel/Fax: 022-795-7043 |
備考 |
： | 講義演題は若干変更になる場合があります。 |