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Precise Purity Evaluation of High-Purity Metals by Residual Resistivity Ratio

Research Project

Project/Area Number 09650803
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Metal making engineering
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

MIMURA Kouji  Inst for Adv. Mat. Processing, Tohoku Univ., Research Asist., 素材工学研究所, 助手 (00091752)

Co-Investigator(Kenkyū-buntansha) ISHIKAWA Yukio  Inst for Adv. Mat. Processing, Tohoku Univ., Research Asist., 素材工学研究所, 助手 (40250823)
ISSHIKI Minoru  Inst for Adv. Mat. Processing, Tohoku Univ., Prof., 素材工学研究所, 教授 (20111247)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
KeywordsHigh purity metals / Residual resistivity ratio / Purity evaluation / Copper / Iron / Cobalt / Trace impurity / Annealing effect / クロム / 高純度化 / 比抵抗 / 水素焼鈍 / 真空焼鈍 / サイズ効果 / 伝導電子
Research Abstract

For purification of metals, the evaluation of the purified metals should be an important subject. So the residual resistivity ratio (RRR = ρィイD2298KィエD2/ρィイD24.2KィエD2) has been widely used to estimate the purity of high-purity metals. However, to evaluate the metal-purity with high accuracy by RRR, there are some problems to be considered.
In this work, the residual resistivity ratios for several high-purity metals, such as Cu, Fe, Co and Cr, prepared by the various purification processes have been measured and the influence of the annealing condition, the size effect, the purity and the remaining trace impurities of the measured specimens on the RRR values has been examined, respectively. The main results are follows.
(1) The optimum annealing conditions of the specimen wire before the RRR measurement have been studied and the most suitable annealing temperature and period were determined for high-purity Cu, Fe, Co and Cr, respectively.
(2) For the size effect of RRR on high-purity Cu, the relationship between RRRィイD2WィエD2 measured for the wires, RRRィイD2BィエD2 of the bulk copper and the specimen diameter has been determined. The RRRィイD2WィエD2 is found to be dependent largely on the specimen diameter. Then, the influence of the size effect must be considered carefully whenever to evaluate and to compare the purity of the high-purity metals by RRR.
(3) The increasing tendencies of the RRR values with raising in the specimen purity in the range of 99.9% to above 99.999% have been made clear for Cu, Fe and Co.
(4) Dependence of the RRR on the concentration of some trace impurities, like phosphorous in high-purity Fe, has been determined quantitatively.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Kouji Mimura: "Precise Purity-Evaluation of High-Purity Coppen by Residual Resistivity Ratio"Materials Trans. JIM. 38. 714-718 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masahito Uchikoshi: "Copper Purification by Anion-Exchange Separation in Chloride Media"Materials Trans. JIM. 38. 1083-1088 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 三村耕司: "高融点金属の高純度化の現状"東北大学素材工学研究所彙報. 53. 66-78 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 宋秀善: "溶媒抽出による鉄の高純度精製"日本金属学会誌. 63. 753-759 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Yukio Ishikawa: "Annealing Effect and Floating Zone Melting Refining of Copper under Hydrogen Atmosphere"Materials Trans. JIM. 40. 87-91 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Mimura: "Precise Purity-Evaluation of High-Purity Copper by Residual Resistivity Ratio"Materials Transactions JIM. Vol. 38, No. 8. 714-718 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Uchikoshi: "Copper Purification by Anion-Exchange Separation in Chloride Media"Materials Transactions JIM. Vol. 38, No. 12. 1083-1088 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Mimura: "Recent Aspect in Purification of Refractory Metals"Bulletin of the Institute for Advanced Processing, Tohoku Univ.. Vol. 53, No. 1-2. 66-78 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Song: "Preparation of High-Purity Iron by Solvent Extraction"J. Japan Inst. Metals. Vol. 63, No. 6. 753-759 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Ishikawa: "Annealing Effect and Floating Zone Melting Refining of Copper under Hydrogen Atmosphere"Materials Transactions JIM. Vol. 40, No. 2. 87-91 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Ishikawa,K.Mimura,M.Isshiki: "Annealing Effect and Floating Zone Refining of Copper under Hydrogen Atmosphere"Materials Transactions, JIM. 40・2. 87-91 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 宋秀善,三村耕司,一色実: "溶媒抽出による鉄の高純度精製"日本金属学会誌. 63・6. 753-759 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Koji Mimura(三村 耕司): "Precise Purity-Evaluation of High-Purity Copper by Residual Resistivity Ratio" Mat.Trans.JIM.38巻8号. 714-718 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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