1993 Fiscal Year Final Research Report Summary
Effect of B Concentration on the Composite Crystal Nd-Fe-B
| Project/Area Number |
05650625
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | Teikyo University |
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Principal Investigator |
OHBA Takuya Teikyo University, Dr of Sci., Asoc.Professor, 理工学部, 助教授 (00211110)
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| Co-Investigator(Kenkyū-buntansha) |
HARA Toru Teikyo University, Research Assistant, 理工学部, 助手 (70238161)
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| Project Period (FY) |
1993 – 1994
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| Keywords | composite crystal / Nd-Fe-B |
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| Research Abstract |
The composite crystal is formed by an interpenetration of two or more subsystems in a crystal. Each subsystem is described to be an ordinary space group. The interpenetration of two or more subsystems forms new space group and sometimes makes a situation difficult to describe the crystal using ordinary space group. Nd-Fe-B B-rich phase is known to be one dimensional composite crystal. There are several reports on the lattice parameter c. The interpenetration of two subsystems makes a situation complicated and leads a several reports on the c axis. We examined an effect of B and Nd concentration on the Nd-Fe-B composite crystal to clarify the situation. The impurities found in our concentration range are NdB4 and Fe2B.The amount of the impurities is depend on Nd and B concentration. This result reveals that the composite crystal is formed at off-stoichiometry of Nd concentration. The most favorable concentration of the composite crystal may be Nd1.2Fe4B4. It was found that the lattice parameter of the c axis is determined by the difference of the c axis of Nd and Fe subsystems in our previous study. Structure analysis shows that B atoms are located close to Nd atoms. This configuration of atoms makes us think that B concentration affects the c axis of the Nd subsystem. Although, in the present study, the c axis of Nd subsystem changes with varying Nd concentration, it is not affected with varying B concentration. Furthermore the c axis of Fe subsystem dose not change for both case. Thus the c axis of the composite crystal is determined from the concentration of Nd atoms.
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Research Products
(2 results)
