On the growth mechanism of electrodeposited PbTe dendrites

Frantz, Cédric; Zhang, Y.; Michler, Johann; Philippe, Laëtitia

doi:10.1039/c6ce00107f

Cited by 8 publications

(5 citation statements)

References 41 publications

(46 reference statements)

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“…5b shows the presence of associated Ag/AgCl crystals on the surface, which appear to act as surface initiation points for the Te deposition. Furthermore, the dendritic-like structure formed during tellurium EW is once again observed with longer experimental durations due to overpotential applied-as has been observed also previously [78][79][80]. This also indicates that the dendritic structure found after EDRR is originally formed by the sacrificial elements during the electrodeposition step.…”

Section: Morphology Of Tellurium Deposits Achieved By Edrr and Ewsupporting

confidence: 82%

Electrochemical recovery of tellurium from metallurgical industrial waste

et al. 2019

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The current study outlines the electrochemical recovery of tellurium from a metallurgical plant waste fraction, namely Doré slag. In the precious metals plant, tellurium is enriched to the TROF (Tilting, Rotating Oxy Fuel) furnace slag and is therefore considered to be a lost resource-although the slag itself still contains a recoverable amount of tellurium. To recover Te, the slag is first leached in aqua regia, to produce multimetal pregnant leach solution (PLS) with 421 ppm of Te and dominating dissolved elements Na, Ba, Bi, Cu, As, B, Fe and Pb (in the range of 1.4-6.4 g dm −3), as well as trace elements at the ppb to ppm scale. The exposure of slag to chloride-rich solution enables the formation of cuprous chloride complex and consequently, a decrease in the reduction potential of elemental copper. This allows improved selectivity in electrochemical recovery of Te. The results suggest that electrowinning (EW) is a preferred Te recovery method at concentrations above 300 ppm, whereas at lower concentrations EDRR is favoured. The purity of recovered tellurium is investigated with SEM-EDS (scanning electron microscope-energy dispersion spectroscopy). Based on the study, a new, combined two-stage electrochemical recovery process of tellurium from Doré slag PLS is proposed: EW followed by EDRR.

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Section: Morphology Of Tellurium Deposits Achieved By Edrr and Ewsupporting

confidence: 82%

Electrochemical recovery of tellurium from metallurgical industrial waste

et al. 2019

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“…The surface energy is used to analyze the dendritic growth tendency or orientation selection of magnesium alloys. It is defined as the energy required to form a unit area of surface 67 – 69 . For an n -layer slab model, the surface energy can be obtained via the following formula: where is the total energy of surface slab unitcell, E b is the total energy of bulk unitcell, A is the area of surface slab unitcell, and the factor of 2 denotes the two equivalent surfaces in the particular slab model.…”

Section: Methodsmentioning

confidence: 99%

Correlation between crystallographic anisotropy and dendritic orientation selection of binary magnesium alloys

Zhang

et al. 2017

Sci Rep

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Both synchrotron X-ray tomography and EBSD characterization revealed that the preferred growth directions of magnesium alloy dendrite change as the type and amount of solute elements. Such growth behavior was further investigated by evaluating the orientation-dependent surface energy and the subsequent crystallographic anisotropy via ab-initio calculations based on density functional theory and hcp lattice structure. It was found that for most binary magnesium alloys, the preferred growth direction of the α-Mg dendrite in the basal plane is always , and independent on either the type or concentration of the additional elements. In non-basal planes, however, the preferred growth direction is highly dependent on the solute concentration. In particular, for Mg-Al alloys, this direction changes from to as the Al-concentration increased, and for Mg-Zn alloys, this direction changes from to or as the Zn-content varied. Our results provide a better understanding on the dendritic orientation selection and morphology transition of magnesium alloys at the atomic level.

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“…This deposition step creates dendritic branches attached to the trunk. 32,33 Despite this phenomenon, the different crater sizes and dendrite congurations between Bi and Sn were attributed to the dissimilar interactivity of the metal precursors with the substrate (Cu) surface and different deposition kinetics. [34][35][36] EDS analysis of the BiSn sample was performed to examine the elemental composition of the surface.…”

Section: Surface Characterization Of the As-synthesized Porous Dendri...mentioning

confidence: 99%