Cu and fe valence states in cufes2

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August undefined, 2024

Webtitle = "Cu and Fe valence states in CuFeS2", abstract = "Mossbauer effect (MES), X-ray photoelectron (XPS) spectroscopies were used to study antiferromagnetic CuFeS2, especially its Cu and Fe ground-state properties. Pressure- and temperature-dependent MES results show that Fe 31 is high-spin. WebDec 24, 2014 · If the Cu–S and Fe–S bonds have ionic characteristic, Fe, Cu, and S should have the nominal valences of 3, 1, and 2, respectively (lost or obtain certain amount of electrons to form a close shell). However, it is found that the valences of Fe and Cu atoms deviate from their according nominal valence significantly.

Cu and Fe valence states in CuFeS2 - ScienceDirect

WebPressure- and temperature-dependent MES results show that Fe 3+ is high-spin. The low isomer shift is constant with pressure, and consistent with strong FeS covalency, not with mixed valency. XPS results indicate that the Cu ion is 1 + (3d 10). For "ideal" CuFeS 2 we extrapolate a hyperfine field of 363 kOe, large enough for Fe 3+ to be high-spin. WebThe valence states of transition metal Cu and Fe atoms [1, 2], the nature of phase transition ... highlighting several aspects of chalcopyrite CuFeS2, including band structure, the oxidation state ... 3p orbitals of S and 3d orbitals of each Cu and Fe. The valence bands laid from -13.91 to -12.40 eV (not shown) ... small and medium-sized business enterprises

Structural, electronic, and elastic properties of CuFeS2: first ...

WebOct 1, 2011 · The temperature dependence of conduction-electron concentration n in CuFeS2 has a power form in the temperature range T = 14−300 K, which is characteristic of the intrinsic conductivity in... WebJan 20, 2024 · According to EDS analysis from the concentrate, the main elements were: 26.30% Cu, 25.88% Fe, and 36.55% S, consistent with the theoretical composition of CuFeS 2. This indicated that a large part of the concentrate was chalcopyrite. Table 1 shows the XRF and mineralogical analysis of the representative concentrate. WebSep 1, 1974 · Cu and Fe valence states in CuFeS2 2004, Journal of Magnetism and Magnetic Materials Show abstract Magnetically ordered multinary semiconductors 1999, Progress in Crystal Growth and Characterization of Materials High-spin low-spin transition in nickel ferrous ferrite under pressure 1987, Journal of Magnetism and Magnetic Materials solid wood butcher block countertops

What are the oxidation state of Cu and Fe in CuFeS2?

Cu and fe valence states in cufes2

WebWhat are the oxidation state of Cu and Fe in CuFeS2 ? Solution The ground state band structure, magnetic moments, charges and population numbers of electronic shells of Cu … WebChalcopyrite (/ ˌ k æ l k ə ˈ p aɪ ˌ r aɪ t,-k oʊ-/ KAL-kə-PY-ryte, -⁠koh-) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS 2 and crystallizes in the tetragonal …

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WebMay 1, 2004 · CuFeS2 High pressure Mixed valency Covalency Chalcopyrite (CuFeS 2) is a semiconductor with unusual magnetic and electrical properties. CuFeS 2 behaves like a Mott insulator. A study on binary transition-metal compounds predicted that CuFeS 2 is close … WebDec 24, 2014 · If the Cu–S and Fe–S bonds have ionic characteristic, Fe, Cu, and S should have the nominal valences of 3, 1, and 2, respectively (lost or obtain certain amount of …

WebMay 1, 2004 · It’s reported that the ion valence state of Cu and Fe in CuFeS2 are +1 and +3, respectively [20]. And it’s understandable that the Cu2+ was reduced due to the … WebCu and Fe valence states in CuFeS 2 Boekema, C. ; Krupski, A. M. ; Varasteh, M. ; Parvin, K. ; van Til, F. ; van der Woude, F. ; Sawatzky, G. A. Mössbauer effect (MES), X-ray …

WebExamples of such compositions occur as chalcopyrite (CuFeS 2 ), bornite (Cu 5 FeS 4 ), chalcocite (Cu 2 S), covellite (CuS), cuprite oxide (Cu 2 O), and malachite (Cu 2 CO 3 (OH) 2 ) among many other minerals . Malachite and sulphides are major deposits in Kenya, with elemental composition of 2.3% Cu found at Macalder in South Nyanza-Kenya . WebApr 13, 2024 · CUMSs/MIL-101(Fe, Cu) inherited the synergistic effect of Fe-Cu bimetallic MILs combined with the construction of mixed valence of Fe(II)/Fe(III) and Cu(I)/Cu(II) as coordinatively unsaturated metal sites (CUMSs), and good catalytic oxidation performance was demonstrated. ... Solid State Chem. 2016, 238, 95–202. [Google Scholar]

WebUsually, experimental data for Cu x Fe y S z system is analyzed on the basis of simple conception of oxidation states: two valence states for copper (Cu1+ and Cu2+), iron …

WebThe ground state band structure, magnetic moments, charges and population numbers of electronic shells of Cu and Fe atoms have been calculated for chalcopyrite CuFeS2 using density functional theory. The comparison between our calculation results and experimental data (X ray photoemission, X ray absorption and neutron diffraction spectroscopy ... small and medium size businessesWebSep 9, 2016 · Monodisperse copper-iron-sulfide (CuFeS2) nanoparticles as the infrared light absorbing material (chalcopyrite, 0.65 eV), were synthesized based on facile, one step heating up method, by... small and medium size companiesWebApr 13, 2024 · An increase in the valence state of the 3d element correlates with a shift of the pre-edge to lower energy and an enhancement of the spectral intensity due to the strong covalence 21,34,35. solid wood bookshelf bookcaseWebApr 10, 2024 · Unprecedented Route to Amide-Functionalized Double-Decker Silsesquioxanes Using Carboxylic Acid Derivatives and a Hydrochloride Salt of Aminopropyl-DDSQ. Anna Władyczyn. and. Łukasz John *. Inorganic Chemistry 2024, 62, 14, 5520-5530 (Article) Publication Date (Web): March 29, 2024. Abstract. solid wood cabinets moorestown njWebJun 15, 2014 · The ground state band structure, magnetic moments, charges and population numbers of electronic shells of Cu and Fe atoms have been calculated for … solid wood cabinets woodbridgeWebtitle = "Cu and Fe valence states in CuFeS2", abstract = "Mossbauer effect (MES), X-ray photoelectron (XPS) spectroscopies were used to study antiferromagnetic CuFeS2, … solid wood butchers block chopping boardWebthe values of Fe magnetic moments in CuFeS2 with 3.85 B are signiﬁcantly less than those for the magnetic trivalent Fe, necessitating considerations of valence states of iron and copper ions [1]. Unusual behavior of electrical resistivity of chalcopyrite leads to the discussions about the nature of its electronic type (for example, solid wood cabinets harrisburg pa