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  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 28 (1995), S. 429-435 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The crystal structure of the YBa4Cu2(CO3)O5.5±δ (`142') oxycarbonate has been investigated by X-ray and neutron powder diffraction techniques. X-ray diffraction patterns indexed as a tetragonal P4/m unit cell with lattice parameters a = 8.1973 (4) and c = 8.0360 (5) Å. Rietveld refinements of powder neutron diffraction data indicated a distorted cubic perovskite cell in which yttrium and copper are arranged to yield a superlattice double that of the typical perovskite unit. Refinements indicate CO2−3 ions substituted on two of the four Cu sites in the proposed cell. Infrared spectroscopy results were consistent with neutron structural analysis, giving strong supporting evidence to the presence of two unique carbonate sites in the unit cell.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 33 (1998), S. 4111-4119 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hydroxyapatite, a calcium phosphate-based compound with numerous applications in the biological field was synthesized using the sol–gel processing route. The formation of hydroxyapatite and other compounds during the heat-treatment cycle were identified and characterized using thermal analyses and X-ray diffraction together with infrared and Raman spectroscopy. The influence of the addition of various organic alcohols (R–OH, R=CH3–, C2H5– and C3H8–) on the reaction results was studied. © 1998 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
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