Corrosion damage to a silver coin ?Sobol??

Erusalimchik, I. G.; Филиппов, М. Н.; Murav’eva, I. V.

doi:10.1007/s11124-005-0029-9

Cited by 3 publications

(2 citation statements)

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“…The coin was made from Sn-Pb alloy and was ascribed to either funerary use, or more probably to coin production carried out during a period of economic difficulty immediately preceding the year 409 BC, when the city of origin was destroyed by Carthaginian armies. Another specific examination was carried out by Erusalimchik et al 305 of Moscow State Technical University on the silver coin 'Sobol', demonstrating that coin blackening was associated with the formation of silver sulfide. Fifteen Indian coins were analysed by EDXRF and PIXE by Santra et al 306 and comparability between the results evaluated.…”

Section: Geological and Industrial Mineralsmentioning

confidence: 99%

Atomic spectrometry update—X-ray fluorescence spectrometry

Potts

Ellis

Kregsamer

et al. 2006

J. Anal. At. Spectrom.

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Section: Geological and Industrial Mineralsmentioning

confidence: 99%

Atomic spectrometry update—X-ray fluorescence spectrometry

Potts

Ellis

Kregsamer

et al. 2006

J. Anal. At. Spectrom.

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“…However, it is often difficult to distinguish the denomination of coin due to serious wear and tear, which increases the difficulty of replacing such coins for subsequent recasting. This problem is also encountered with ancient coins found in archaeological digs which are often worn and damaged coins 6 and prove difficult to determine their category and dynasty.…”

Section: Introductionmentioning

confidence: 99%

Rapid Elemental Determination And Discrimination Of Coins Using Laser-Induced Breakdown Spectroscopy

Liu¹

2021

At.Spectrosc.

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Damaged coins can be identified effectively via spectral analysis based on LIBS, which is of great significance for coin recycling. This paper takes the Renminbi (RMB), the Chinese currency, as the example, including the denominations of YI FEN, ER FEN, WU FEN, YI JIAO, WU JIAO and YI YUAN. Some characteristic lines of Mg, Al, Fe, Cr, Cu, Sn, Ni, Na and Ca were observed in the spectra, as well as the molecular bands of AlO. Principal component analysis (PCA) was used to reduce the dimension of the spectra of the different RMB coins. The samples after dimension reduction are classified by k-Nearest Neighbors (KNN), and 4 categories were obtained with a classification accuracy of 100%. Further, new spectra of different denomination RMB coins were added to the original data for the same analysis. The results are in good agreement which shows the potential of the combination of LIBS, PCA and KNN for the analysis and identification of different coins.

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Electrocatalytic property of nitrogen-doped graphite-supported CeO₂-CoO_x

Yue

Liu

et al. 2021

Mater. Res. Express

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Ceria has been widely used as a catalyst in photocatalysis, automobile exhaust purification, and organic degradation. However, ceria has poor intrinsic catalytic performance and usually requires modifications. In this study, N-doped graphite was used as a substrate, and then CeO2-CoOx was attached to N-doped graphite. Afterward, the effects of the recombination with N-doped graphite and those of Co doping on the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic ability of CeO2 were studied. The experimental results showed that the electrocatalytic performance of CeO2-CoOx/N-rGO is higher than that of pure CeO2 and CeO2/N-rGO. After the N-doped graphite recombination, the number of transferred electrons increased at high potential, which fully illustrates that graphite can effectively reduce the overpotential of ORR. The 0.56 eV shift of the C1s in CeO2-CoOx/N-rGO to high binding energy revealed that CeO2-CoOx and N-rGO were combined with each other through covalent bonds. In addition, the increased pyridine nitrogen of N-rGO after the recombination improved the electrocatalytic performance of CeO2-CoOx/N-rGO. Overall, the catalytic ability of CeO2 was greatly improved, and the modified CeO2-CoOx/N-rGO composite showed better catalytic performance for the ORR and OER compared with Pt/C and RuO2.

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Corrosion damage to a silver coin ?Sobol??

Abstract: The surface of a silver coin "Sobol'" is investigated by local x-ray fluorescence analysis and measuring the electrode potential. It is shown that the coin blackening is associated with the formation of silver sulfide Ag 2 S.

Cited by 3 publications

References 0 publications

Atomic spectrometry update—X-ray fluorescence spectrometry

Atomic spectrometry update—X-ray fluorescence spectrometry

Rapid Elemental Determination And Discrimination Of Coins Using Laser-Induced Breakdown Spectroscopy

Electrocatalytic property of nitrogen-doped graphite-supported CeO₂-CoO_x

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Corrosion damage to a silver coin ?Sobol??

Abstract: The surface of a silver coin "Sobol'" is investigated by local x-ray fluorescence analysis and measuring the electrode potential. It is shown that the coin blackening is associated with the formation of silver sulfide Ag 2 S.

Cited by 3 publications

References 0 publications

Atomic spectrometry update—X-ray fluorescence spectrometry

Atomic spectrometry update—X-ray fluorescence spectrometry

Rapid Elemental Determination And Discrimination Of Coins Using Laser-Induced Breakdown Spectroscopy

Electrocatalytic property of nitrogen-doped graphite-supported CeO2-CoOx

Contact Info

Product

Resources

About

Electrocatalytic property of nitrogen-doped graphite-supported CeO₂-CoO_x