Thermal Oxidation of ZnS Modifications Sphalerite and Wurtzite

Schultze, D.; Steinike, U.; Kussin, J.; Kretzschmar, U.

doi:10.1002/crat.2170300422

Cited by 28 publications

(16 citation statements)

References 3 publications

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“…This is manifested also by lifetime measurements [3]. Earlier investigations with simultaneous thermogravity -differential thermal analysis and in-situ X-ray diffraction [15] as well as optical studies [16] showed that temperature treatment of ZnS samples in air leads to oxidation of ZnS and transformation into ZnO at temperatures between 650 to 750 "C. Our results show that the influence of oxygen is already important at much lower temperatures involving the appearance of larger defect complexes. Energy dispersive X-ray spectroscopy (EDX) confirms that in the region where the positrons annihilate, ZnS had indeed transformed into ZnO.…”

Section: Cvd Annealing Temperature [°C]supporting

confidence: 68%

Vacancy-Type Defects in Electron and Proton Irradiated II- VI Compounds

Brunner¹,

Puff²,

Mascher³

et al. 1996

MRS Proc.

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In this contribution, we present a study aimed at investigating the basic properties of radiation induced defects in ZnS and ZnO and the influence of the atmosphere on the annealing characteristics of the defects. Positron annihilation experiments (both lifetime and Dopplerbroadening measurements) were performed on both single-and polycrystalline samples, irradiated with 3 MeV protons or 1 MeV electrons. For ZnS it was found that both electron and proton irradiation caused significant changes in the positron annihilation characteristics. The annealing of proton irradiated ZnS in air leads to significant oxidation and eventual transformation into ZnO.

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Section: Cvd Annealing Temperature [°C]supporting

confidence: 68%

Vacancy-Type Defects in Electron and Proton Irradiated II- VI Compounds

Brunner¹,

Puff²,

Mascher³

et al. 1996

MRS Proc.

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“…This makes the situation more complex, since strain effects due to coexistence of the two minerals intervene 31 . Moreover, the cluster size of ZnO–ZnS solid solution depends on dimensionality and growth conditions 32–34 . Finally, since Ni and Co increase their percentages in this area of the sample, other metal complexes can also act as impurities on the ZnS structure (see comparison between Figs.…”

Section: Resultsmentioning

confidence: 99%

Combined micro X-ray absorption and fluorescence spectroscopy to map phases of complex systems: the case of sphalerite

Marini¹,

Rovira²,

Ramanan³

et al. 2019

Sci Rep

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Combining micro-X-ray absorption spectroscopy (μXAS) and micro-X-ray fluorescence spectroscopy (μXRF) is a promising approach for the investigation of complex multi-phase systems. In this work, we have employed this approach to investigate natural sphalerite, the most common form of Zinc Sulfide. Spatially resolved elemental distribution maps of common 3d metal atoms (Zn, Cu, Ni, Co, and Fe) are superimposed with chemical speciation and structural parameter maps in order to understand the sphaleriteore-formation process and metamorphosis. Chemical speciation and structural parameters have been obtained by analyzing the μXAS spectra collected in several representative points of the sample, after μXRF mapping. In the present case, this X-ray based approach has permitted to determine the spatial distribution of the Zn species in sphalerite. The presence of two main zincite and smithsonite inclusions has been established, with the latter located close to copper impurity center. Since copper is known to remarkably reduce the corrosion resistance of zinc, resulting in the formation of carbonate as the corrosion product, this implies a possible role of Cu in the growth of the carbonate inclusions. The results obtained highlight the efficiency of this method in univocally identifying the spatial distribution of phases in complex systems, thanks to the simultaneous access to complementary information.

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“…Up to 120 °C there is an initial 6 % endothermic weight loss owing to evaporation of physisorbed water, followed by exothermic processes in the range 120–500 °C, which adds up to a further 5 %, consistent with the pyrolysis of the adsorbed surfactants molecules. Above 700 °C there is a slight weight increase that corresponds to the gradual oxidation of sulfide to oxide with the intermediate mass gain owing to formation of sulfate species 35…”

Section: Resultsmentioning

confidence: 99%

An Effective Two‐Emulsion Approach to the Synthesis of Doped ZnS Crystalline Nanostructures

et al. 2015

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The controlled, room-temperature synthesis of M-doped (M = Cu-II, Mn-II, Sm-III, Gd-III, or Tb-II) ZnS nanostructures (with an average crystallite size of 5-10 nm) in the confined space of miniemulsion droplets is reported herein and discussed. The adopted synthetic route is a colloidal method, ideally suited to easily achieve small particle size and narrow size distribution. The synthesized functional nanostructures crystallize in the sphalerite lattice, as determined by powder X-ray diffraction. In addition to structural characterization, several complementary techniques, such as X-ray photoelectron spectroscopy, thermogravimetric analysis, differential scanning calorimetry, micro-Raman spectroscopy, inductively coupled plasma mass spectrometry, and Fourier transform infrared spectroscopy were used to determine chemical and physical properties as well as the microstructural features of our products. As far as the morphological aspects of the obtained samples are concerned, they were studied by means of scanning and transmission electron microscopies. Finally, the local structure around dopant ions was unravelled by means of X-ray absorption spectroscopy, in particular through extended X-ray absorption fine structure measurements carried out at the Zn, S, and dopant K or L-3 edges. This information has been complemented with the investigation of the photoluminescence properties

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Thermal Oxidation of ZnS Modifications Sphalerite and Wurtzite

Cited by 28 publications

References 3 publications

Vacancy-Type Defects in Electron and Proton Irradiated II- VI Compounds

Vacancy-Type Defects in Electron and Proton Irradiated II- VI Compounds

Combined micro X-ray absorption and fluorescence spectroscopy to map phases of complex systems: the case of sphalerite

An Effective Two‐Emulsion Approach to the Synthesis of Doped ZnS Crystalline Nanostructures

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