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Metals 2017, 7(5), 160; doi:10.3390/met7050160

Comparative Morphological and Crystallographic Analysis of Electrochemically- and Chemically-Produced Silver Powder Particles

1
Mining and Metallurgy Institute-Department for Experimental Testing of Precious Metals, Zeleni bulevar 35, 19 210 Bor, Serbia
2
ICTM-Department of Electrochemistry, University of Belgrade, Njegoševa 12, 11 000 Belgrade, Serbia
3
Vinča Institute of Nuclear Sciences-Department of Materials Science, University of Belgrade, 11 000 Belgrade, Serbia
4
Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1a, 11 000 Belgrade, Serbia
*
Author to whom correspondence should be addressed.
Academic Editor: Jürgen Eckert
Received: 27 March 2017 / Revised: 25 April 2017 / Accepted: 28 April 2017 / Published: 5 May 2017
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Abstract

Silver powders chemically synthesized by reduction with hydrazine and those produced by electrolysis from the basic (nitrate) and complex (ammonium) electrolytes were examined by X-ray diffraction (XRD) and scanning electron microscopic (SEM) analysis of the produced particles. Morphologies of the obtained particles were very different at the macro level. The needle-like dendrites, as well as the mixture of irregular and regular crystals, were formed from the nitrate electrolyte, while the highly-branched pine-like dendrites with clearly noticeable spherical grains were formed from the ammonium electrolyte. The agglomerates of spherical grains were formed by reduction with hydrazine. In the particles obtained from the nitrate electrolyte, Ag crystallites were strongly oriented in the (111) plane. Although morphologies of Ag particles were very different at the macro level, the similarity at the micro level was observed between chemically-synthesized particles and those obtained by electrolysis from the ammonium electrolyte. Both types of particles were constructed from the spherical grains. This similarity at the micro level was accompanied by the similar XRD patterns, which were very close to the Ag standard with a random orientation of Ag crystallites. For the first time, morphologies of powder particles were correlated with their crystal structure. View Full-Text
Keywords: silver; powder particles; chemical synthesis; electrolysis; scanning electron microscope (SEM); X-ray diffraction (XRD) analysis silver; powder particles; chemical synthesis; electrolysis; scanning electron microscope (SEM); X-ray diffraction (XRD) analysis
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MDPI and ACS Style

Avramović, L.; Pavlović, M.M.; Maksimović, V.M.; Vuković, M.; Stevanović, J.S.; Bugarin, M.; Nikolić, N.D. Comparative Morphological and Crystallographic Analysis of Electrochemically- and Chemically-Produced Silver Powder Particles. Metals 2017, 7, 160.

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