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  • 1
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 21 (1994), S. 526-536 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: X-ray photoelectron spectroscopy (XPS) has been used to investigate the interaction of copper(II)-containing aerated aqueous solution (pH 4-10) with pyrite (FeS2) surfaces and its influence on subsequent ethyl xanthate adsorption from solution. Evidence is provided that Cu(II) ions can be adsorbed independent of pH, changing their oxidation state to Cu(I). This is attributed to a new Cu-S surface species, In addition, Cu(II) can be stabilized as a complex hydroxy species on pyrite at pH ≥ 6. Time-dependent adsorption studies were carried out to elucidate the influence of pH on the copper adsorption rate, considering also the different copper oxidation states. A fast saturation of the sulphide surface with Cu(I) is observed at pH 5, whereas the Cu(I) uptake starts only slowly at pH 8 and pH 10. Prolonged conditioning in alkaline solution results in a precipitation of Cu(II) hydroxy species. Simultaneously, the amount of adsorbed Cu(I) increases until the same Cu(I) level is reached as in acidic media. After subsequent immersion in ethyl xanthate solution of pH 6-9, both Cu(I) and Cu(II) ions adsorbed on pyrite are found to form Cu(I) ethyl xanthate in accordance with previously published infrared spectroscopic and microflotation results.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Lithium indate(III) ; α-Lithium ytterbate(III) ; crystal structures ; MAPLE ; "split position" ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Two Representatives of the α-LiFeO2 Type: LiInO2 and α-LiYbO2Single crystals of LiInO2 (well ground mixtures of ‘In2O’: KO2: Li2O = 1:1.8:1, Ag-tube, 22d, 520°C); and α-LiYbO2 (Yb2O3:Li2O = 1:1.1, Ni-tube, 30d, 1150°C) were prepared for the first time from mixtures of the binary oxides. The determination of the structure confirmed the α-LiFeO2 type. Both oxides crystallize in the space group I 41/amd (Z = 4); LiInO2: a = 431.2(1) pm c = 934.2(2) pm; c/a = 2.167; 123 Io(hkl), R = 3.6%, Rw = 2.9%. α-LiYbO2:a = 438.7(1) pm c = 1006.7(2) pm; c/a = 2.295, 130 Io(hkl), R = 4.4%, Rw = 3.6%. The Madelung part of lattice energy, MAPLE and characteristics of this kind of structure are discussed.
    Notes: LiInO2 (aus innigen Gemengen von binären Oxiden, ‘In2O’: KO2:Li2O = 1:1, 8:1, Ag-Bombe, 22d, 520°C); sowie α-LiYbO2 (aus den binären Oxiden Yb2O3:Li2O = 1:1,1, Ni-Bombe, 30d, 1150°C) wurden erstmals als Einkristalle dargestellt. Die Strukturverfeinerung bestätigt den α-LiFeO2 Typ. Beide Oxide kristallisieren in der Raumgruppe I 41/amd (Z = 4); LiInO2: a = 431,2(1) pm c = 934,2(2) pm; c/a = 2,167;123 Io(hkl), R = 3,6%, Rw = 2,9%.α-LiYbO2:a = 438,6(1) pm c = 1006,7(2) pm; c/a = 2,295; 130 Io(hkl), R = 4,4%, Rw = 3,6%. Der Madelunganteil der Gitterenergie, MAPLE und Besonderheiten dieses Strukturtyps werden diskutiert.
    Additional Material: 12 Tab.
    Type of Medium: Electronic Resource
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