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

通过残余电阻率比精确评估高纯金属的纯度

基本信息

批准号：
09650803
负责人：
MIMURA Kouji
金额：
$ 0.64万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650803/
关键词：
High 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

项目摘要

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.

对于金属的提纯，提纯后金属的评价应该是一个重要的课题。因此，残余电阻率比（RRR = ρ ε D2298 K Ω D2/ρ ε D24.2K Ω D2）已被广泛应用于高纯金属纯度的评价。本工作测量了几种高纯金属（Cu、Fe、Co、Cr）在不同提纯工艺条件下的剩余电阻率，讨论了退火条件、尺寸效应、分别考察了被测样品的纯度和残留微量杂质对RRR值的影响。主要结果如下。(1)研究了测定RRR前试样的最佳退火条件，确定了高纯Cu、Fe、Co和Cr的最佳退火温度和退火时间。(2)对于高纯铜的RRR尺寸效应，测定了线材的RRR_（？）D_2W_（？）D_2和块体铜的RRR_（？）D_2B_（？）D_2与试样直径的关系。发现RRRD_2W_2D_2很大程度上取决于试样直径。因此，在用RRR法评价和比较高纯金属的纯度时，必须仔细考虑尺寸效应的影响。(3)在99.999%~ 99.999%以上的范围内，Cu、Fe、Co的RRR值随试样纯度的增加而增加。(4)某些微量杂质，如高纯度铁中的磷的浓度的RRR的依赖性，已被定量测定。