Application of 57Fe Mössbauer spectroscopy as a tool for mining exploration of bornite (Cu5FeS4) copper ore

Gainov, Ramil R.; Vagizov, F. G.; Golovanevskiy, Vladimir; Ksenofontov, Vadim; Klingelhöfer, G.; Klekovkina, V. V.; Шумилова, Т. Г.; Pen’kov, I. N.

doi:10.1007/s10751-013-0980-9

Cited by 7 publications

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“…No clear signs of superparamagnetic blocking and (super)spin-glass freezing in valleriite, which are typical for magnetic nanoparticles and nanolayered structures, for example, − were found. At any cost, no paramagnetic-to-antiferromagnetic state transitions were observed in both valleriites, in contrast to bornite with a Néel temperature of 65 K. ,,, …”

Section: Resultsmentioning

confidence: 89%

“…24 No clear signs of superparamagnetic blocking and (super)spin-glass freezing in valleriite, which are typical for magnetic nanoparticles and nanolayered structures, for example, 78−81 were found. At any cost, no paramagnetic-to-antiferromagnetic state transitions were observed in both valleriites, in contrast to bornite with a Neél temperature of 65 K. 53,54,82,83 Chemical Bonding in Sulfide Sheets and Implications for the Formation of Valleriite. The combination of element-sensitive Cu K-and Fe K-edge X-ray absorption spectroscopy together with previous soft XANES studies (Cu L-, Fe L-and others), 31 XPS, and Mossbauer spectroscopy allow us to shed new light onto the chemical states of copper and iron.…”

Section: ■ Characterizationmentioning

confidence: 97%

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Valleriite, a Natural Two-Dimensional Composite: X-ray Absorption, Photoelectron, and Mössbauer Spectroscopy, and Magnetic Characterization

et al. 2021

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Valleriite is of interest as a mineral source of basic and precious metals and as an unusual material composed of two-dimensional (2D) Fe−Cu sulfide and magnesium hydroxide layers, whose characteristics are still very poorly understood. Here, the mineral samples of two types with about 50% of valleriites from Noril'sk ore provenance, Russia, were examined using Cu K-and Fe K-edge X-ray absorption fine structure (XAFS) spectroscopy, X-ray photoelectron spectroscopy (XPS), 57 Fe Mossbauer spectroscopy, and magnetic measurements. The Cu K X-ray absorption near-edge structures (XANES) spectra resemble those of chalcopyrite, however, with a higher electron density at Cu + centers and essentially differ from those of bornite Cu 5 FeS 4 ; the Fe K-edge was less informative because of accompanying oxidized Fecontaining phases. The post-edge XANES and extended XAFS (EXAFS) analysis reveal differences in the bond lengths, e.g., additional metal−metal distances in valleriites as compared with chalcopyrite. The XPS spectra confirmed the Cu + and Fe 3+ state in the sulfide sheets and suggest that they are in electron equilibrium with (Mg, Al) hydroxide layers. Mossbauer spectra measured at room temperature comprise central doublets of paramagnetic Fe 3+ , which decreased at 78 K and almost disappeared at 4.2 K, producing a series of hyperfine Zeeman sextets due to internal magnetic fields arising in valleriites. Magnetic measurements do not reveal antiferromagnetic transitions known for bornite. The specific structure and properties of valleriite are discussed in particular as a platform for composites of the 2D transition metal sulfide and hydroxide (mono)layers stacked by the electrical charges, promising for a variety of applications.

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