A5020149830- Zeolite Catalysis and Synthesis
- Crystal Structures and Properties
- Chemical Synthesis and Characterization
- X-ray Diffraction in Crystallography
- Metal-Organic Frameworks: Synthesis and Applications
- Polyoxometalates: Synthesis and Applications
- Solid-state spectroscopy and crystallography
- Mesoporous Materials and Catalysis
- Advanced NMR Techniques and Applications
- Catalysis and Oxidation Reactions
- Inorganic Fluorides and Related Compounds
- Clay minerals and soil interactions
- Inorganic Chemistry and Materials
- Crystallization and Solubility Studies
- Geological and Geochemical Analysis
- Thermal and Kinetic Analysis
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Ferroelectric and Piezoelectric Materials
- Mineralogy and Gemology Studies
- Thermal Expansion and Ionic Conductivity
- Microwave Dielectric Ceramics Synthesis
- Luminescence Properties of Advanced Materials
- Crystallography and molecular interactions
- Inorganic and Organometallic Chemistry
Western Illinois University
2013-2022
Leibniz Supercomputing Centre
2010
Northwestern University
2004-2009
University of Bremen
2004
University of Chicago
1998-2003
University of Manitoba
2000
Goethe University Frankfurt
1988-1997
DuPont (United States)
1989
University of Illinois Chicago
1972-1986
University of Illinois Urbana-Champaign
1975
The distribution of bond lengths in (V3+O6) polyhedra shows a maximum between 1.98 and 2.04 Å, limits 1.88 2.16 respectively. (V4+On) (V5+On) (n = 5, 6) show distinct populations which allow us to define the following types bonds: (1a) vanadyl bonds polyhedra, shorter than 1.74 Å; (1b) (V5+O5) 1.76 (1c) (V5+O6) (2a) equatorial range 1.90 2.12 (2b) longer (2c) with one bond, 2.10 (2d) two bonds, 1.80 2.00 (3a) trans (V4+O6) (3b) 2.15 (3c) 2.025 Å. average length can be used calculate mean...
Ordered Li4SiO 4 is monoclinic with space group P2~/m and a = 11.546 (3), b 6.090 (2), c 16.645 (3) A, fl 99.5 (1) °. The substructure identical to the previously refined structure of Li4SiO4 [V611enkle, Wittman & Nowotny (1968). Monatsh. Chem. 99, 1360-1371 ]. superstructure was solved R~ 6% for 1390 independent reflections. Li atoms are ordered occupy 19 42 sites in sevenfold supercell. LiO 4, 5 6 polyhedra linked by edge- corner-sharing. There good three-dimensional connectivity between...
Compilation of 221 space group corrections from a false low symmetry (FS) to higher true (TS) shows that is often overlooked in only few space-group types.
Abstract A set of 102 empirical effective ionic radii applicable to nitrides has been derived from over 500 experimental interatomic distances observed in 324 crystal structure determinations nitrides, amides, ammines, cyanides, azides, imides, nitrosyls, nitryls and organometallic compounds. The take into account the oxidation numbers electronic spin states cations, coordination both cations nitride ions. Cation-nitride can be estimated sums appropriate radii, on average within less than...
Crystals of MgSO4.4 tt~O and FeSO4.4H20 have the lattice parameters a=5.922, b=I3.604,c=7.90~A, fl=90°51" a=5.979, b=13-64 s, c=7.97~A, fl=90 ° 26', space group P21/n.The structures been determined by two-dimensional Fourier (Fo-t%) syntheses.Isolated Me2(SO4) 2 .8 H20 rings are linked hydrogen bonds.Comparison with other salt hydrates which accurately known reveals that certain details these may be explained in terms Pauling's electrostatic valence rule.The Me-O O-H • O distances altered if...
FeSO 4. 71-I20 crystallizes in space group _P21/c with a = 14.072, b =6.503, c 11.041/~, fl 105 ° 34', Z =4.The crystal structure had been determined from Patterson and Fourier syntheses usingFho~ Fhk0 data.The refinement was done by the method of least squares employing 738 observed factors zones hIcO, hO1, Olcl, h3l h/el.The final R value, including contribution hydrogen atoms is 4.5%.The iron ions occupy special positions are surrounded octahedrally six water molecules each.The oxygens...
Abstract Rutile type crystal structures and their derivatives are based on the same topology of primary bonds: straight chains edge-sharing coordination octahedra connected via corner-sharing to four surrounding chains. Twenty known. Some an ordering cations, others anions, still distortions polyhedra. The overwhelming majority all compounds reviewed here crystallize in aristotypic rutile type. trirutile type, variant, CaCl2 a distorted rutile, also numerous. other known only from one, two,...