Raman spectra and unit cell parameters of sphalerite solid solutions (FexZn1−xS)

Осадчий, Е. Г.; Gorbaty, Yuri E.

doi:10.1016/j.gca.2009.10.022

Cited by 46 publications

(31 citation statements)

References 18 publications

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“…The first one was not reported so far for sphalerite, but it can be assigned to lattice modes in the unoriented sample. The 304 cm −1 and 354 cm −1 bands are typical for sphalerite, being similar to the ones from previous studies [52,62,63] with a slight shift of 4 cm −1 in the bands position. The Raman band assignments for sphalerite suggest that the ~350 cm −1 peak is due to Zn-S vibrations, while the ~300 and ~331 cm −1 are controlled by the vibration of Fe-S bonds [52,63].…”

Section: Colloform Sphaleritesupporting

confidence: 89%

“…The 304 cm −1 and 354 cm −1 bands are typical for sphalerite, being similar to the ones from previous studies [52,62,63] with a slight shift of 4 cm −1 in the bands position. The Raman band assignments for sphalerite suggest that the ~350 cm −1 peak is due to Zn-S vibrations, while the ~300 and ~331 cm −1 are controlled by the vibration of Fe-S bonds [52,63]. In the present study, the line at ~331 cm −1 is missing or it is overlapped by the more intense band at 354 cm −1 , suggesting a sample with low Fe content [52].…”

Section: Colloform Sphaleritesupporting

confidence: 89%

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Valentinite and Colloform Sphalerite in Epithermal Deposits from Baia Mare Area, Eastern Carpathians

et al. 2020

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Valentinite forms through the alteration of stibnite in sulphide deposits. Colloform sphalerite is a widespread mineral in low-temperature deposits, particularly those of the Mississippi-Valley type. We identified valentinite and colloform sphalerite in hydrothermal deposits occurring in the Baia Mare area. The Baia Mare metallogenic district of Neogene age occurs in the northwestern part of the Neogene volcanic chain within the Eastern Carpathians. The Neogene volcanism from Baia Mare area is related to the subduction processes of the East European plate under two microplates, Alcapa and Tisza-Dacia/Tisia, in the post-collisional compressive phase. We have identified valentinite in the Dealul Crucii and Baia Sprie deposits, associated with other epithermal minerals, in the absence of the stibnite. Valentinite is deposited in the final phase of the epithermal process after calcite and manganese-bearing calcite. Micro-Raman and microprobe determinations indicate the presence of valentinite. The formula of valentinite is close to stoichiometric Me2O3 and contains small amounts of tin as an antimony substituent. Colloform sphalerite was identified in the Baia Sprie ore deposit associated with minerals formed in the final epithermal phase. It was deposited on idiomorphic crystals of stibnite, which it corrodes. Its structure and an alternate banding, exhibited on the nano-/microscale, were identified by optical microscopy, SEM (scanning electron microscopy), and BSE (backscattered electron microscopy) imaging. These structures are typical for colloform sphalerite and suggest a genesis due to episodic precipitation. The spherical nano/micro-particles (nodules) are characteristic of the colloform sphalerite from Baia Sprie. Raman analysis indicates the presence of a colloform sphalerite with low iron content. The typical diffraction lines for sphalerite were identified in X-ray diffraction: 3.118 Å (111), 1.907 Å (220), 1.627 Å (311). Microprobe analysis certifies the presence of sphalerite with the stoichiometric formula close to ZnS. Iron content is low (0%–0.0613%), but Sb (0.7726%–2.6813%), Pb (0.56%–1.1718%), Bi (0%–0.1227%) are also present. The negative correlation between Zn and Sb suggests the simultaneous deposition from the same epithermal fluids. Valentinite and colloform sphalerite were formed at low temperatures (100–150 °C) at the end of the epithermal process.

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Section: Colloform Sphaleritesupporting

confidence: 89%

Section: Colloform Sphaleritesupporting

confidence: 89%

Valentinite and Colloform Sphalerite in Epithermal Deposits from Baia Mare Area, Eastern Carpathians

et al. 2020

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“…However, this is assigned to the presence of Fe 3+ , rather than the isovalent substitution considered in the present work, and therefore the absence of this peak in our vibrational spectra is consistent with this interpretation. Osadchii and Gorbaty (2010) found a strong increase in Raman intensities with Fe content at 295 and 325 cm -1 , and…”

Section: Vibrational Spectra For Fe-doped Znsmentioning

confidence: 92%

“…Vibrational spectroscopy, based on both infra-red and Raman techniques, has been used to experimentally characterize the presence of Fe within the sphalerite structure (Pring et al 2008, Osadchii andGorbaty 2010). Although several peaks may be identified, the interpretation and assignment of these modes is not unambiguous and therefore computational methods can potentially offer some insight.…”

Section: Vibrational Spectra For Fe-doped Znsmentioning

confidence: 99%

A first principles study of the distribution of iron in sphalerite

Wright

Gale

2010

Geochimica et Cosmochimica Acta

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Abstract.Quantum mechanical techniques, based on density functional theory, have been used to study the distribution of iron impurities in sphalerite (ZnS) at compositions ranging from 3.125 to 12.5 mol% FeS. Our results show that iron is most easily incorporated by direct substitution onto the zinc site and that energies for solution reactions involving FeS are exothermic when the system is zinc deficient. Furthermore, there appears to be a small driving force for the formation of bound Fe-Fe pairs at low iron concentrations, though there is no particular preference found for larger clusters of iron. The influence of iron on the sphalerite cell parameter is shown to be sensitive to the presence of Fe-Fe pairs and to the degree of sample non-stoichiometry.3

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“…Scale-up and emission tunability using copper doping were confirmed 38 spectroscopically. Surface characterization was determined using Fourier transform infrared and X-ray 39 photoelectron spectroscopies, which confirmed amino acid as proteins and bacterial fermentation end 40 products not only maintaining a nano-dimensional average crystallite size, but also increasing 41 aggregation. The application of ZnS nanoparticle ink to a functional thin film was successfully tested 42 for potential future applications.…”

mentioning

confidence: 93%

Scalable production of microbially mediated zinc sulfide nanoparticles and application to functional thin films

et al. 2014

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Raman spectra and unit cell parameters of sphalerite solid solutions (FexZn1−xS)

Cited by 46 publications

References 18 publications

Valentinite and Colloform Sphalerite in Epithermal Deposits from Baia Mare Area, Eastern Carpathians

Valentinite and Colloform Sphalerite in Epithermal Deposits from Baia Mare Area, Eastern Carpathians

A first principles study of the distribution of iron in sphalerite

Scalable production of microbially mediated zinc sulfide nanoparticles and application to functional thin films

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