Results 21 to 30 of about 16,793 (198)

STREAM SEDIMENT CARTOGRAPHY OF KIMBERLITE OCCURRENCES IN KIMPANGU AND ITS SURROUNDINGS (CENTRAL KONGO, DEMOCRATIC REPUBLIC OF THE CONGO) USING GEOCHEMICAL SIGNATURES OF HEAVY MINERALS [PDF]

Geological Behavior
Microscopic analysis and interpretation of the geochemical signatures of heavy minerals collected during stream sediment execution in the Kimpangu agglomeration and surrounding area have revealed the existence of four mineralogical families: ilmenites ...
Christian MUPER, Emmanuel CIBAMBULA, Elie UTHERA, Odrick TUEMA   +3 more
doaj   +1 more source

Synthesis of Li1.05MxMn2-xO4 (M = Co3+ and/or Cr3+, x = 0.1 or 0.2) and their application as cathode materials for lithium-ion batteries

International Journal of Electrochemical Science, 2021
Pristine Li1.05Mn2O4 and its trivalent metal-substituted spinels of Li1.05MxMn2-xO4 (M = Co3+ and/or Cr3+, x = 0.1 or 0.2) were synthesized by a simple citric acid-assisted sol-gel method.
Xiuhua Zhang, Wanting Liu, Chenhao Zhao, Shasha Yang, Baoping Zhang   +4 more
doaj   +1 more source

Orbitally-driven Peierls state in spinels [PDF]

, 2004
We consider the superstructures, which can be formed in spinels containing on B-sites the transition-metal ions with partially filled t2g levels. We show that, when such systems are close to itinerant state (e.g.
D. I. Khomskii, J. Labbe, K. I. Kugel, K. I. Kugel, K. I. Kugel, M. Mizoguchi, T. Mizokawa   +6 more
core   +1 more source

Evolution mechanisms of MgO-Al2O3 in non-oriented silicon steel

工程科学学报, 2015
The evolution mechanisms of MgO-Al2O3 in the process of calcium treatment in non-oriented silicon steel were studied by laboratory experiments, with focus on the evolution process in the early and middle of calcium treatment.
SUN Yan-hui, ZHAO Yong, CAI Kai-ke, SUN Sai-yang, MA Zhi-fei, FANG Zhong-qiang   +5 more
doaj   +1 more source

Structural, Mechanical, Elastic, Electronic, Magnetic and Optical Properties of Spinel Compounds ATi2S4 (A=Ca, Sr and Ba): AB Initio Study

Annals of West University of Timisoara: Physics, 2023
This research explored the crystal structure, mechanical and elastic, electronic, magnetic, and optical properties of spinel compoundsATi2S4 (A=Ca, Sr and Ba).
Bousahla Mohammed Nadir, Bousahla Mohammed Alaa, Chahed Abbes, Bousahla Zouaoui, Rozale Habib, Bendjilali Hadjer   +5 more
doaj   +1 more source

Electronic band structure and exchange coupling constants in ACr2X4 spinels

, 2007
We present the results of band structure calculations for ACr2X4 (A=Zn, Cd, Hg and X=O, S, Se) spinels. Effective exchange coupling constants between Cr spins are determined by fitting the energy of spin spirals to a classical Heisenberg model.
A. N. Yaresko, A. P. Ramirez, J. Akimitsu, J. Krok-Kowalski, S. Pouget, T. N. Borovskaya   +5 more
core   +1 more source

Study of hyperfine interactions in spinel cobalt ferrite CoFe2O4 doped with Hf, Lu, and Yb using Mössbauer spectroscopy and perturbed γ-γ angular correlation

Конденсированные среды и межфазные границы
We studied hyperfine interactions (HFI) in spinel cobalt ferrite (ferrospinel) CoFe2O4 doped with Lu, Yb, and Hf (1 wt. %) by Mössbauer spectroscopy (MS) on 57Fe nuclei.
Viktor M. Vakhtel, Atanas I. Velichkov, Dimitar V. Karaivanov, Maria M. Milanova, Yuri G. Segal, Nargiza Temerbulatova, Dmitry V. Filosofov, Martin P. Tsvetkov   +7 more
doaj   +1 more source

Pseudo-Goldstone magnons in the frustrated S=3/2 Heisenberg helimagnet ZnCr2Se4 with a pyrochlore magnetic sublattice [PDF]

, 2017
Low-energy spin excitations in any long-range ordered magnetic system in the absence of magnetocrystalline anisotropy are gapless Goldstone modes emanating from the ordering wave vectors.
Abernathy, D. L., Cameron, A. S., Efremov, D. V., Felea, V., Inosov, D. S., Loidl, A., Mueller, T., Ollivier, J., Onykiienko, Y. A., Piovano, A., Portnichenko, P. Y., Rachel, S., Schneidewind, A., Thomale, R., Tsurkan, V., Tymoshenko, Y. V.   +15 more
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Copper-manganese-zinc spinels in zeolites: study of EMR spectra

Nukleonika, 2015
The aim of this study is the application of electron magnetic resonance (EMR) spectroscopy to determine the interactions between NaY and HY zeolites and Cu-Mn-Zn spinels loaded onto the zeolite surfaces.
Decyk Piotr, Więckowski Andrzej B., Najder-Kozdrowska Lidia, Bilkova Iveta   +3 more
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Electronic structure study of vanadium spinels by using density functional theory and dynamical mean field theory

, 2017
Theoretically, various physical properties of AV$_{2}$O$_{4}$ (A=Zn, Cd and Mg) spinels have been extensively studied for last 15 years. Besides of this, no systematic comparative study has been done for these compounds, where the material specific ...
Lal, Sohan, Pandey, Sudhir K.
core   +1 more source