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Browsing ELibrary by Title
Now showing items 11811-11830 of 21821
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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 ...
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(2002)Phosphorus was discovered in 1669 by Hennig Brand. The word phosphorus originates from the two Greek words phos , meaning light, and phoros , meaning bearer, due to the phosphorescent nature of white phosphorus. Phosphorus ...
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(1999)
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(2001)This chapter discusses the crystal chemistry, emphasizing observed chemical variations, for those zeolites that completely fulfill the requirements of Smith (1963) for a zeolite. These requirements include: (a) a ...
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(1999)The crystal structure of a low-silica and fully dehydrated NaX zeolite, the synthetic analogue of natural faujasite, with approximate chemical composition Na93Al93Si99O384 (Si/Al = 1.06) as determined by microprobe and NMR ...
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(2003)Grechishchevite, Hg3S2(Br,Cl,1)2, is the only known mercury sulfohalide whose anionic part involves three halogens Cl, Br, and I, in addition to sulfur. The crystal structure of the mineral was not solved. The structure ...
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(2003)The previously unknown crystal structure of the basic lead nitrate Pb2(OH)3(NO3) has been determined using single-crystal X-ray diffraction data (Mo-Kα radiation, CCD area detector). The compound is orthorhombic, space ...
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(2004)The crystal structure of arapovite, ideally U4+ (Ca,Na)2 (K1– x □ x ) [Si8 O20], x ≈ 0.5, tetragonal, a 7.5505(4), c 14.7104(9) A, V 838.6(1) A3, space group P 4 /mcc , Z = 2, D calc. 3.365 g/cm3, was refined to an R 1 ...
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(2002)The crystal structure of arsentsumebite, ideally, Pb2Cu[(As, S)O4]2(OH), monoclinic, space group P21/m, a = 7.804(8), b = 5.890(6), c = 8.964(8) Å, β = 112.29(6)°, V = 381.2 Å3, Z = 2, dcalc. = 6.481 has been refined to ...
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(1997)The crystal structure of averievite, Cu5O2(VO4)2·nMX has been determined. Trigonal system, space group P3, a = 6.375(1), c = 8.399(1) Å, V = 295.6(1) Å3, Z = 1, Dx = 4.01(1) g/cm3. The atomic arrangement is characterized ...
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(2001)The crystal structure of baricite, the Mg-dominant analogue of vivianite, (Mg1.70Fe1.30-x2+Fex3+)(PO4)(2)(OH)(x). (8-x)H2O, a 10.085(2), b 13.390(3), c 4.6713(9) Angstrom, beta 104.96(3)degrees, V 609.4(1) Angstrom (3), ...
Now showing items 11811-11830 of 21821