| Project/Area Number |
60850131
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SUZUKI Yasuyuki (1986) Faculty of Engineering, The University of Tokyo, Research Associate, 工学部, 助手 (80150283)
下斗米 道夫 (1985) 東京大学, 工, 助教授 (60011110)
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| Co-Investigator(Kenkyū-buntansha) |
DOYAMA Masao Faculty of Engineering, The University of Tokyo, Professor, 工学部, 教授 (40010748)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1985: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Rare earth-iron-boron / Magnetocrystalline anisotropy / High-pressure-production / Crystal-field calculation / Ytterbium / イッテルビウム-鉄-ボロン / 希土類 / 永久磁石 / 磁気異方性 / 結晶場 |
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| Research Abstract |
In 1983 Sagawa, Sumitomo Special Metals Co. Ltd., reported a new permanent material based on the compound <Nd_2> <Fe_(14)> B. The Material exhibit coercivity and energy product as large as 11 kOe and 47 MGOe, respectively. They also reported the magnetocrystalline anisotropy of the <RE_2> <Fe_(14)> B series. On this study, we tried to product <Yb_2> <Fe_(14)> B. At normal pressure it was not able to be produced. We tried to make it by high-pressure-production which pressure is 15 kbar-20 kbar. At high pressure ytterbium changes to <Yb^(3+)> ion and <Yb_2> <Fe_(14)> B was made as <Yb_2> <Fe_(14)> B phase. The data which we can obtain was the Curie point 545 K and the lattice constants a-axis 8.740 angstrom, c-axis 11.910 angstrom. We also make crystal-field calculation by using Tokyo computer centre and analyze it for <Yb_2> <Fe_(14)> B. By using the result which we obtained by a experiment. The stabilization energy <DELTA> F of a <Yb^(3+)> moment alignment parallel to the c axis relative to alignment parallel to [100] in the basal plane is obtained.
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