Mössbauer study of bornite and chemical bonding in Fe-bearing sulphides

Borgheresi, M.; Benedetto, Francesco Di; Romanelli, Marco; Reissner, M.; Lottermoser, Werner; Gainov, Ramil R.; Khassanov, R. R.; Tippelt, Gerold; Giaccherini, Andrea; Sorace, Lorenzo; Montegrossi, Giordano; Wagner, Reinhard; Amthauer, Georg

doi:10.1007/s00269-017-0911-4

Cited by 10 publications

(25 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Collins et al (1981) investigated the antiferromagnetic spin ordering of Cu 5 FeS 4 by means of neutron powder diffraction; remarkably, no new magnetic peaks were detected in the diffraction patterns collected between 18 K and 4.2 K, suggesting that the magnetic feature observed at about 8 K can result from spin re-orientation. Recently, further evidence from Mö ssbauer spectroscopy (Borgheresi et al, 2018) confirmed the temperature value of 67.5 K for the magnetic transition. In any case, no evidence for a structural transition is reported associated to this magnetic transition.…”

Section: Introductionmentioning

confidence: 87%

“…14975), was collected at the Cu-sulfide ore of Montecatini (Northern Apennines, Italy). The sample was chosen because of its almost perfect stoichiometric composition (Borgheresi et al, 2007(Borgheresi et al, , 2018.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, the second mechanism is in agreement with previous literature findings and it is also in line with the attribution of Fe ordered in its own sites supported by both EXAFS and XRPD structural data. Namely, in literature studies, both magnetic susceptibility measurements (Jagadeesh et al, 1981) and Mö ssbauer spectroscopic data (Borgheresi et al, 2018) have been interpreted in the light of partial charge transfer processes. Possibly both mechanisms are somehow involved, but more precise insights could be gained by neutron diffraction.…”

Section: X-ray Powder Diffraction Analysis and Rietveld Refinementmentioning

confidence: 99%

“…However, the second mechanism, which is in line with the attribution of Fe ordered in its own sites supported by both EXAFS and XRPD structural data, is also in agreement with previous literature findings. Namely, in literature studies, both magnetic susceptibility measurements (Jagadeesh et al, 1981) and Mö ssbauer spectroscopic data (Borgheresi et al, 2018) have been interpreted in the light of partial charge transfer processes. In order to finally discriminate between these two mechanisms, further investigations using neutron diffraction are in progress.…”

Section: Localization Of Fe In the Structurementioning

confidence: 99%

See 3 more Smart Citations

The puzzling structure of Cu₅FeS₄ (bornite) at low temperature

Martinelli

Lepore²,

Bernardini

et al. 2018

Acta Crystallogr B Struct Sci Cryst Eng Mater

Self Cite

View full text Add to dashboard Cite

The crystal structure of Cu 5 FeS 4 (bornite) has been investigated using synchrotron X-ray powder diffraction at temperatures between 10 and 275 K. Diffraction data confirm that bornite crystallizes in the orthorhombic space group Pbca at 275 K. The unit-cell volume decreases continuously on cooling, but undergoes an abrupt contraction below $ 65 K, where a first-order Pbca!Pca2 1 structural transition takes place. The primary active mode yielding the observed ordered structure corresponds to the irreducible representation À 2 À , with wavevector (0,0,0). Pair distribution function analysis shows strong discrepancies between the local and the average structure. The average Fe-S bond length obtained through the EXAFS local probe is consistent with the values independently provided by X-ray powder diffraction data, strongly supporting the preferred location of Fe.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: X-ray Powder Diffraction Analysis and Rietveld Refinementmentioning

confidence: 99%

Section: Localization Of Fe In the Structurementioning

confidence: 99%

See 2 more Smart Citations

The puzzling structure of Cu₅FeS₄ (bornite) at low temperature

Martinelli

Lepore²,

Bernardini

et al. 2018

Acta Crystallogr B Struct Sci Cryst Eng Mater

Self Cite

View full text Add to dashboard Cite

show abstract

“…Iron preferentially occurs as Fe 3+ -S centers but Fe 2+ -S, Fe 3+ -OH and Fe 2+ -OH species may exist too [26,[35][36][37]. Recently we performed X-ray absorption, photoelectron (XPS), Mössbauer spectroscopy and magnetic investigation of natural valleriite samples [38,39] and found, in particular, that the Mössbauer signals of paramagnetic Fe 3+ transform to a series of Zeeman sextets below 70 K instead of antiferromagnetic ordering in bulk chalcopyrite CuFeS2 and other Cu-Fe sulfides [40]. Exact nature of the Fe species and many basic properties of valleriites are still indeterminate due to the complexity of mineral assemblages.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of nanoscale composite particles formed by 2D layers of Cu-Fe sulfide and Mg-based hydroxide

Mikhlin¹,

Борисов

Vorobyev³

et al. 2022

Preprint

View full text Add to dashboard Cite

We introduce here a multifunctional material composed of alternating atomic sulfide sheets close to CuFeS2 and Mg-based hydroxide ones (valleriite), which are assembled due to their electric charges of opposite sign. Valleriite particles of 50-200 nm in the lateral size and 10-20 nm thick were synthesized via a simple hydrothermal pathway using various concentrations of precursors and dopants, and examined with XRD, TEM, EDS, X-ray photoelectron spectroscopy, reflection electron energy loss spectroscopy (REELS), Mössbauer, Raman and UV-vis-NIR spectroscopies, magnetic, dynamic light scattering, zeta potential measurements. The electronic, magnetic and optical characteristics are found to be critically dependent of the charge (electron density) at the narrow-gap sulfide layers containing Cu+ and Fe3+ cations, and can be tuned via the composition of hydroxide part. Particularly, substitution of Mg2+ with Al3+ increases the negative charge of the hydroxide layers and reduces the content of Fe3+-OH centers (10-45% of total iron); the effects of Cr and Co dopants entering both layers are more complicated. Mössbauer doublets of paramagnetic Fe3+ detected at room temperature transform to several Zeeman sextets at 4.2 K; the hyperfine fields up to 500 kOe and complex magnetic behavior, but not pure paramagnetism or antiferromagnetism, were observed for valleriites with the higher positive charge of the sulfide sheets, probably due to the depopulation of the minority-spin 3d states of S-bonded Fe3+ ions. Aqueous colloids of valleriite show optical absorption at 500 - 750 nm, which, along with the peaks at the same energies in REELS, may arise due to quasi-static dielectric resonance involving the vacant Fe 3d band and being dependent on the composition of both layers too. These and other findings call attention to the of valleriites as a new rich family of 2D materials for a variety of potential applications.

show abstract