Results 11 to 20 of about 14,550 (311)
Grain size of gold and gold alloys [PDF]
Gold Bulletin, 1981 Dieter Ott, Christoph J. Raub
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Mineralogy and mineral chemistry of detrital platinum-group minerals and gold particles from the Elbe, Germany [PDF]
European Journal of Mineralogy, 2023 In heavy mineral concentrates of the Elbe, gold and platinum-group minerals (PGMs) are observed. Two fractions (> 63 and < 63 µm) of the concentrate are analyzed by reflected-light microscopy, scanning electron microscopy with automated mineralogy ...
M. Junge +3 more
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Promotion of the Cupellation Method for Accurate Determination of Gold Alloy’s Karat Containing Platinum-Group Metals [PDF]
Iranian Journal of Chemistry & Chemical Engineering, 2020 The main standard method for gold karat determination is the cupellation method. However, this method is not sufficiently accurate to determine gold karat in the presence of insoluble Platinum–Group Metals (PGMs), such as Ir, Ru, and Rh.
Farahnaz Rejali, Behzad Rezaei
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Geosciences, 2021 While gold partitioning into hydrothermal fluids responsible for the formation of porphyry and epithermal deposits is currently well understood, its behavior during the differentiation of metal-rich silicate melts is still subject of an intense ...
Nikolai Berdnikov +4 more
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The influence of cupric ions on shape of potentiodynamic curves obtained on 18 K gold [PDF]
Journal of Mining and Metallurgy. Section B: Metallurgy, 2002 The shape of potentiodynamic curves depends mainly on the composition of investigated alloys, but also on the electrolyte used in experiments. In this work investigation were performed for pure gold, and pure silver and copper as alloying metals, then ...
Rajčić-Vujasinović Mirjana +3 more
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Electrochemical investigation of 18k gold in acidic electrolyte [PDF]
Hemijska Industrija, 2009 The results of an attempt in using cyclic voltammetry for characterization of gold, silver, copper and 18-k gold alloys by their anodic behavior in 1 mol/dm3 H2SO4 are presented in this paper.
Grekulović Vesna J. +2 more
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Geosciences, 2022 Gold is typically transported by mafic and evolved magmas into the upper crust to be deposited in shallow oxidized porphyry and epithermal environments.
Nikolai Berdnikov +3 more
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Gold Bulletin, 1999 From ancient times, gold has been used mostly in decorative items, and the colour of gold plays an important role in this application field. Different methods have been developed to objectively characterize the colour. This paper describes the CIELAB system, which has gained acceptance as an effective way to assess colour.
Cretu, Cristian, van der Lingen, Elma
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Plating and Surface Treatments on Ancient Metalwork
Advances in Archaeomaterials, 2020 This paper presents an overview of techniques employed in antiquity—in different regions and at different times—for decorating metals by plating or applying surface treatments.
Alessandra Giumlia-Mair
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Scientific Reports, 2021 We report high optical enhancement in Ag/Au alloys and porous gold nanostructures using Surface Enhanced Raman Spectroscopy (SERS) technique. Scanning electron microscopy investigation shows the formation of Ag/Au alloys particles during irradiation of ...
C. Awada +4 more
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