Growth and Corrosion of Native Zinc in a Gaseous Medium

Novgorodova, M. I.; Boyarskaya, R. V.; Yusupov, R. G.

doi:10.1080/00206818609466265

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Cos mic or technogenic origin is frequently ascribed to the ball shaped particles found in placers. Spherules in hypogene ores are often interpreted as derived from gases (Novgorodova, Boyarskaya, and Yusupov, 1986;Novgorodova et al, 2003;Gamyanin et al, 2000). For the spherules found in the weathering mantle or oxida tion zone, no reliable indications for their chemogenic origin are commonly adduced (Dyusembaeva and Rodnova, 2003).…”

Section: Morphology Of Gold Particles In Weathering Mantles and Role mentioning

confidence: 98%

Nanoparticles of noble metals in the supergene zone

et al. 2012

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Section: Morphology Of Gold Particles In Weathering Mantles and Role mentioning

confidence: 98%

Nanoparticles of noble metals in the supergene zone

et al. 2012

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Greenockite Whiskers from the Bytom Burned Coal Dump, Upper Silesia, Poland

2020

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Orange greenockite (CdS) aggregates were found in a small fumarole at a burned coal dump near Bytom, Upper Silesia, Poland and were studied using a variety of techniques in order to determine their chemistry, morphology, and most importantly, the mechanism of crystal growth. Greenockite rods, wires, and whiskers with bismuth drops on crystal tops are predominant in these aggregates. Greenockite rods oriented sub-perpendicular to the substrate surface. The rod thickness reaches 5–6 μm and about 10 μm in length. The catalyst bismuth drop has a diameter comparable to the rod thickness. Fiber forms (wires and whiskers) are sub-parallel to the substrate surface. The thickness of these forms is usually less than 2 μm, and the length can be close to 1 mm. The bismuth drop diameter can show a large excess over the fiber thickness. Catalyst drops on the tops of whiskers began to change their form dynamically and exploded, spraying bismuth under the electron beam effect. Rods grow along the [01–10] direction, and whiskers and wires (axial forms) along the [0001] direction. Greenockite rod crystals, carrying on top a relatively homogenous bismuth catalyst drop, were formed on the heated substrate according to the VLS (vapor–liquid–solid) mechanism at temperatures not lower than 270 °C. Greenockite whiskers and wires grew just above of the substrate surface according to the VQS (vapor–quasiliquid–solid) mechanism at temperatures lower than 200 °C. These mechanisms of growth have very rarely been recorded to occur in nature and even less so in burning coal dumps. The cooperative growth effects of the fiber greenockite crystals were also described.

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Growth and Corrosion of Native Zinc in a Gaseous Medium

Cited by 2 publications

References 2 publications

Nanoparticles of noble metals in the supergene zone

Nanoparticles of noble metals in the supergene zone

Greenockite Whiskers from the Bytom Burned Coal Dump, Upper Silesia, Poland

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