Results 31 to 40 of about 16,793 (198)

Spin Frustration and Magnetic Exchange in Cobalt Aluminum Oxide Spinels

, 2007
We report on x-ray diffraction, magnetic susceptibility, electron- spin resonance and heat- capacity studies of Co[Al_1-xCo_x]_2O_4 for Co concentrations ...
A. H. St. C. O’Neill, A. Krimmel, A. Loidl, A. P. Ramirez, B. Büchner, G. Behr, H. A. Krug von Nidda, J. A. Mydosh, N. Tristan, P. Cossee, R. Klingeler, S. Krupička, V. Tsurkan, V. Zestrea, W. L. Roth, X. Liu   +15 more
core   +1 more source

The formation of boundary clinopyroxenes and associated glass veins in type B1 CAIs [PDF]

, 2009
We used focused ion beam thin section preparation and scanning transmission electron microscopy (FIB/STEM) to examine the interfacial region between spinel and host melilite for spinel grains in type B1 inclusions from the Allende and Leoville ...
Abreu, Armstrong, Bacon, Barber, Barber, Beckett, Beckett, Beckett, Bernatowicz, Bleiner, Blum, Blum, Bradley, Caillet, Caillet, Cain, Campbell, Clayton, Connolly, Connolly, Connolly, Croat, Daulton, Daulton, Fahey, Floss, Fransolet, Gaetani, Giannuzzi, Giannuzzi, Goresy, Gray, Greshake, Grossman, Grossman, Grossman, Heaney, Hill, Ireland, Ito, Keller, Keller, Kennedy, Kieffer, Komorowski, Kuehner, Kurat, Lee, Lin, Lin, Lundstrom, MacPherson, MacPherson, MacPherson, Marvin, Mendybaev, Nakamura, Nguyen, Obst, Overwijk, Palme, Paque, Paque, Paque, Peters, Prenitzer, Reid, Richter, Richter, Richter, Rives, Simon, Simon, Simon, Simon, Stolper, Stolper, Streck, Stroud, Sylvester, Vidal, Weber, Wei, Wirth   +83 more
core   +1 more source

MORPHOLOGICAL AND COMPOSITIONAL FEATURES OF CHROMIAN SPINEL FROM MANTLE ULTRAMAFIC ROCKS OF THE NURALI MASSIF (SOUTH URALS) [PDF]

Минералогия, 2019
Accessory chromian spinels of lherzolites and dunites from a mantle section of the Nurali ophiolite massif are described in the paper. Lherzolites typically host anhedral chromian spinel grains associated with olivine, pyroxenes and plagioclase.
D.E. Saveliev
doaj   +1 more source

Spectroscopic Characteristics and Coloring Mechanisms of Different Colored Spinels from Myanmar

Crystals, 2023
Spinel is a common gemstone that has attracted the attention of gemologists worldwide because of its high refractive index, rich colors and brilliant hues. Myanmar is an important source of spinel. The present paper provides a systematic characterization
Lei Zhang, Kui He, Qingfeng Guo
doaj   +1 more source

Comparative study of the electronic structures of Fe3O4 and Fe2SiO4

, 2010
The electronic properties of two spinels Fe$_3$O$_4$ and Fe$_2$SiO$_4$ are studied by the density functional theory. The local Coulomb repulsion $U$ and the Hund's exchange $J$ between the $3d$ electrons on iron are included.
Oleś, A. M., Parlinski, K., Piekarz, P.
core   +1 more source

Geochemistry of spinels from xenoliths of mantle lherzolites (sverre Volcano, spitsbergen Archipelago)

Записки Горного института, 2017
The paper presents the results of a study (LA-ICP-MS method) of spinel from the collection of mantle xenoliths of lherzolites (seven xenoliths) selected in quaternary alkaline basalts of the Sverre volcano, the Spitsbergen archipelago.
D. S. Ashikhmin, Yu.-S. Chen, S. G. Skublov, A. E. Mel'nik   +3 more
doaj   +1 more source

X-ray Diffraction Analysis of Cu2+ Doped Zn1-xCuxFe2O4 Spinel Nanoparticles using Williamson-Hall Plot Method

, 2019
The nanoparticles (NPs) of Zn1-xCuxFe2O4 (ZCFO) spinels with x = 0, 0.2, 0.4, 0.6 and 0.8 were synthesized by a sol-gel combustion method using acetate precursor. The NPs of ZCFO were prepared by following calcination process at 600C for 8hrs.
Kumar, Abhishek, Kumar, Dinesh, Prakash, Rajiv, Singh, Akhilesh Kumar   +3 more
core   +1 more source

Ultra-depleted melts from Kamchatkan ophiolites : evidence for the interaction of the Hawaiian plume with an oceanic spreading center in the Cretaceous? [PDF]

, 2009
We report new data on the major and trace element composition of melt inclusions in spinel phenocrysts (Mg# = 0.7-0.8, Cr/(Cr + Al) = 0.32-0.52, TiO2 = 0.06-0.60 wt.%) from Cretaceous MORB-like basalt (La/Yb = 0.94, Th/Nb = 0.055, Th/La = 0.041) in the ...
Hoernle, Kaj, Portnyagin, Maxim, Savelyev, D.   +2 more
core   +1 more source

Synthesis, Stability and DC-electrical Conductivity of Vanadium and Chromium Dual Doped LiMn2O4 Spinals as Cathode Material for Use in Lithium Rechargeable Batteries

International Journal of Electrochemical Science, 2014
V5+ and Cr6+ double doped nano lithium manganese oxide spinels Li[VxCrxMn2-2X]O4, (x=0.00, 0.02, 0.05 %)] were synthesized by doping the pure spinel LiMn2O4 with vanadium and chromium ions as cathode materials for rechargeable batteries applications ...
Fawaz A. Saad, Morsi M. Abou-Sekkina, Abdalla M. Khedr, Fouad G. El-Metwaly   +3 more
doaj   +1 more source

Is there a common theme behind the correlated-electron superconductivity in organic charge-transfer solids, cobaltates, spinels and fullerides?

, 2011
We posit that there exist deep and fundamental relationships between the above seemingly very different materials. The carrier concentration-dependences of the electronic behavior in the conducting organic charge-transfer solids and layered cobaltates ...
Alexandrov, Anderson, Barnes, Bañobre-López, Brouet, Capone, Clay, Clay, Foo, Hasan, Iwasa, Johnston, Kanoda, Kato, Li, Mazumdar, Mazumdar, Merino, Mizokawa, Motohashi, Okamoto, Radaelli, Saito, Sakurai, Schafroth, Shimojima, Takada, Uemura, Varma, Wang, Wu   +30 more
core   +1 more source