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Browsing ELibrary by Title
Now showing items 11871-11890 of 21934
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(1995)The relationship between the reduction in fission-track diameter and the reduction in areal track density in hydrated glass shards has been investigated under varying annealing and etching conditions. A near 1:1 relation ...
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(2004)Dauphas et al. [Astrophys. J. 565 (2002) 640–644] reported molybdenum isotopic anomalies in differentiated and bulk primitive meteorites. It is shown here that these isotopic anomalies correlate with one another in exactly ...
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(1997)The chemistry of Be and B in the solar nebula is reinvestigated using thermodynamic equilibrium calculations. The dominant Be gases are monatomic Be at high temperatures and the hydroxides BeOH and Be(OH)2 at lower ...
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(1999)We review long-standing reports of both the `Hg paradox' that Hg abundances in meteorites are inconsistent with its volatile behavior and the anomalous 196Hg/202Hg ratios in all types of extraterrestrial material. A careful ...
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(1995)The free energy of formation of Cr2O3, defined by the reaction2 Cr + 32 O2 = Cr2O3, has been measured electrochemically using a yttria-doped thoria (YDT) solid electrolyte, in the temperature range from 900 to 1400 K. Fe ...
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(2003)Data on the Paleozoic and Mesozoic fossil plants of Northern Caucasia have been collected and integrated by the author on the basis of an electronic database. The structure of this database is aimed at the effective ...
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(1987)Upper Cretaceous carbonate sequences contain omission surfaces, hardgrounds and intercalations of ‘clays’. These ‘clays’ are largely associated with submarine biogeochemical carbonate dissolution that was caused by high ...
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(2001)Single crystals of Li-aegirine LiFe3+Si2O6 were synthesized at 1573 K and 3 GPa, and a polycrystalline sample suitable for neutron diffraction was produced by ceramic sintering at 1223 K. LiFe3+Si2O6 is monoclinic, space ...
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(2003)The three binary garnet solid solutions FeII3Al2Si3O12–XII3Al2Si3O12 (XII = MgII, MnII, CaII) have been investigated by 57^Fe Mssbauer spectroscopy at 298 and 77 K and by electronic structure calculations in the local spin ...
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(2002)Beryllium is not a very abundant element in the Earth, but, being an incompatible element in common rock-forming silicate minerals, it is susceptible to concentration via fractionation in geochemical processes. Moreover, ...
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(2002)Synthetic, flux-grown uvarovite, Ca3Cr2 [SiO4]3, was investigated by optical methods, electron microprobe analysis, UV-VIS-IR microspectrometry, and luminescence spectroscopy. The crystal structure was refined using ...
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(2001)Six garnet crystals with compositions close to the uvarovite-grossular binary from three different localities (Saranov, Veselovsk, and Saranka, Ural Mountains, Russia) were investigated by optical methods, electron microprobe ...
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(2002)Fersmanite, Ca-4(Na,Ca)(4)(Ti4+,Nb)(4) (Si2O7)(2) O-8 F-3, is the only mineral with an isolated layer of corner-sharing ({Ti4+,Nb}O-6) octahedra. The crystal structure of fersmanite from the Khibina alkaline massif, Kola ...
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(2004)Phosphates of compositions (Na1-xLix)1.5Mn1.5Fe1.5(PO4)3 were synthesized by solid state reactions in air, and pure alluaudite-type compounds were obtained for x = 0.00, 0.25, and 0.50. Rietveld refinements of X-ray powder ...
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(2001)The crystal structure of malinkoite, NaBSiO4, a 13.8964(4) Å, c 7.7001(2) Å, P63, Z = 18, Dx = 2.922 g cm-3, from the Khibina-Lovozero complex, Kola peninsula, Russia, has been solved by direct methods and refined to an R ...
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(2003)The crystal structures of three nepheline samples, (1) K1.91 Na6.04 Si8.15 Al7.72 Fe3+0.10 O32, a 9.9995(6), c 8.384(2) Å, P63, Z = 1, Dx = 2.673 g cm-3, from the Khibina-Lovozero complex, Kola Peninsula, Russia, (2) K1.60 ...
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(2003)The crystal structure of shcherbakovite from Mount Rasvumchorr, Khibina massif, Kola Peninsula, Russia, ideally K2 Na Ti 4+ 2 O (OH) (Si4O12), a 8.1538(4), b 10.5569(5), c 13.9882(6) A, V 1204.1(2) A 3 , space group Imma, ...
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(2004)Chains of (TiO 6) octahedra occur in several crystal structures as fundamental building blocks, confirming the tendency of self-polymerization for (TiO 6) octahedra. There are two topologically distinct types of chains ...
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(2001)A series of fluoride perovskites related to neighborite was investigated using X-ray and neutron diffraction techniques, and Rietveld profile refinement of powder diffraction data. The series (Na1− x K x )MgF3 comprises ...
Now showing items 11871-11890 of 21934