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SOME CHARACTERISTICS
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Not all methods, the equipment and qualification allow to measure chemical purity of copper equally. Especially it concerns purity of 5N+ and above. Also, if physical characteristic is required, it will be impossible to tell precisely about it by means of only the chemical analysis, especially in cryogenics. Often direct measuring of characteristic is required.
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Electrical conductivity - 104 - 105% IACS.
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Measuring of electrical conductivity has made for representative sample after annealed. Maximal electrical conductivity of samples is G (max; samples) =G o ∈ [104,24; 105,13]. G o is value measured for one of the best samples on a chemical composition, but not the best. Statistical distribution of deviation of electrical conductivity from G o for experimental lots :
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Grade
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[- 0.хх; 0]
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[0; 0.05]
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[0; 0.10]
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[0; 0.15]
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[0; 0.20]
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[0; 0.45]
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Electrical conductivity
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New (10.05.2018)
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Extra
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~0.6
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~0.9
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1
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Basic+
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0.2-0.3
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0.5-0.6
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0.6-0.8
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1
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Basic
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0.2-0.3
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0,4-0,5
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0.5-0.7
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0.8-0.9
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1
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Basic+Ag
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0.2-0.3
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0.4-0.5
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0.5-0.7
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0.8-0.9
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1
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Representative sample was formed on the basis of the enough of chemical analyses describing fluctuations of a chemical compound of the BASIC quality of the experimental product. At sampling, the known various influence of various impurities on electric conductivity also was considered. It was verified and was traced that also is an attribute of quality of sampling and measuring. The structure of ingots of samples is close or identical to other ingots.
Results of measuring of electrical conductivity and the presented statistical interval distribution of deviations of electric conductivity enough correctly reflects the given characteristics of the experimental lots. |
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RRR ( R293K/R4.2K ) and Thermal Conduction
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Reflectance and Surface resistance.
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RRR and Thermal Conduction - are expected 5-1X ? times higher (at appropriate low temperatures) than for classical oxygen-free copper. RRR is expected 60-95% of RRR max (C10100 : RRR ~250 or < 8-13% from possible). After annealing.
Forecasting expectations in 60-95 % from RRR max have under themselves the bases. Electrical conductivity is 104-105% IACS and some various sources assert that electrical conductivity for pure "correct copper of 99,999%" is not less ~103, 4-6% IACS and RRR > 1000. There are also other researches not contradicting forecasts, and also the reasons resulting from our Technology. Forecasting expectations are quite real, above all the question is in statistical distribution of current product in the forecast. In any case, such results can be received, our Technology can recieve it. |
There are given some data of researches of reflection loss and surface resistance of a copper mirror from our copper on some frequencies from temperature. In original articles our copper is mentioned as ultra-pure copper 99.999 or highly pure copper 99.999 (HP copper). At present under our grades, the investigated sample is super pure copper.
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Some researches :
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Shape: ingot close to cylinder, diameter of 85-95 mm, height/length of 100-150 mm.
Similar to monocrystal (several single crystals).
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There is typical shape and structure of copper, more photos can be examined at section "Documents".
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We invite to cooperation.
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Sibneotech is producer of highly pure oxygen-free copper.
Copper is available in purities from 99.999+% to 99.9999+%.
Copper is available in purities from 99.999+% to 99.9999+%.
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