Cu and fe valence states in cufes2
WebMay 5, 2015 · Computationally, CuFeS 2 is difficult to model using density functional theory (DFT) with simple local or semilocal functionals such as the local density … 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 .
Cu and fe valence states in cufes2
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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. WebFeb 28, 2024 · The earth-abundant natural mineral chalcopyrite CuFeS 2 is a potential n-type thermoelectric material because of its large Seebeck coefficient at high carrier concentrations.
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 … 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
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 … WebMar 17, 2016 · characteristic of an isolated high-spin trivalent Fe3+ iron with d5 con guration ( B = 5). In order to explain the low e ective magnetic moment, it has been suggested that CuFeS 2 is a mixture of two ionic states, that is, Cu+Fe3+(S2) 2 and Cu 2+Fe (S2) 2 10,14. Attempts to measure the optical (E o) and fundamental (E g) band gaps have lead to ...
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 …
WebSep 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... how to start lspdfrWebMay 10, 2016 · A number of papers report that the formal valency states of chalcopyrite are best considered as $\ce{Cu+Fe^3+S2}$, based on various computational and … react icon color not changingWebThe 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) ... how to start losing weight againWebSamenvatting Mossbauer effect (MES), X-ray photoelectron (XPS) spectroscopies were used to study antiferromagnetic CuFeS2, especially its Cu and Fe ground-state … react icon button bootstrapWebWhat 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 … how to start low fodmap dietWebDec 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. how to start low carb diet for beginnersWebOct 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... react icon in input