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  • 1990-1994  (4)
  • 1965-1969  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Surface and bulk properties of mechanically activated zinc sulphide (1992)
    Springer
    Journal of materials science 27 (1992), S. 653-657 
    Details
    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 BET, scanning electron microscopy, X-ray photoelectron, infrared, X-ray diffraction and Mössbauer spectroscopy methods were used to identify changes in surface, structural and spectroscopic properties of sphalerite produced by mechanical activation. Activated samples exhibit amorphization of crystallographic structure of the mineral, as well as of hyperfine structure of the accessory manganese. The presence of a new magnetic phase was disclosed in the samples activated for longer periods of time. Changes in structure are accompanied by mechanochemical oxidation of the surface layer of sphalerite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02403874
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  • 2
    Electronic Resource
    Electronic Resource
    Surface and bulk properties of mechanically activated zinc sulphide (1992)
    Springer
    Journal of materials science 27 (1992), S. 653-657 
    Details
    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 BET, scanning electron microscopy, X-ray photoelectron, infrared, X-ray diffraction and Mössbauer spectroscopy methods were used to identify changes in surface, structural and spectroscopic properties of sphalerite produced by mechanical activation. Activated samples exhibit amorphization of crystallographic structure of the mineral, as well as of hyperfine structure of the accessory manganese. The presence of a new magnetic phase was disclosed in the samples activated for longer periods of time. Changes in structure are accompanied by mechanochemical oxidation of the surface layer of sphalerite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554031
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  • 3
    Electronic Resource
    Electronic Resource
    Book reviews (1967)
    Springer
    Atomic energy 23 (1967), S. 777-787 
    Details
    ISSN: 1573-8205
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01565743
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  • 4
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Cr2O3-Mischoxidkatalysatoren. III. ZrO2/Cr2O3 (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 355 (1967), S. 52-63 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The system ZrO2—Cr2O3 has been investigated up to 16 mol-% Cr2O3. The crystal structure of ZrO2 depends on the amount of added Cr which is inserted into the lattice as Cr5+ and Cr3+.
    Notes: Das System ZrO2—Cr2O3 wurde bis zu einem Gehalt von 16 Mol-% Cr2O3 untersucht. Die Kristallstruktur des ZrO2 hängt vom Cr2O3-Zusatz ab, wobei Cr5+- und Cr3+-Ionen in das ZrO2-Gitter eingebaut werden. Die kristallchemischen Bedingungen für den Einbau werden erörtert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673550107
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  • 5
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Cr2O3-Mischoxidkatalysatoren. IV. Zum System MgO—Cr2O3Professor Günther Rienäcker zum 65. Geburtstage am 13. Mai 1969 gewidmet (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 366 (1969), S. 240-248 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The phase composition of MgO/Cr2O3 mixed oxides prepared at various temperatures was investigated by chemical analysis, X-ray, IR-spectroscopic, and ESR measurements. The order of spinel phase increases with increasing temperature of preparation. No intermediate disordered structure was observed.
    Notes: Die Phasenzusammensetzung von MgO/Cr2O3-Mischoxiden, die bei verschiedenen Temperaturen hergestellt worden sind, wird durch chemische Analyse, röntgenographische, IR-spektroskopische und ESR-Messungen ermittelt. Die Ordnung innerhalb der sich bildenden Spinellphase wächst mit zunehmender Herstellungstemperatur. Ungeordnete Übergangsphasen wurden nicht beobachtet.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693660315
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  • 6
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Mischoxidkatalysatoren. VI. TiO2—V2O5 (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 368 (1969), S. 10-17 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: ESR studies on TiO2—V2O5 mixed oxide catalysts show that vanadium is incorporated into the rutile lattice as V4+ ion and also occurs as VO2+ ion on the surface. The concentration of the surface VO2+ ions is a function of the V2O5 content per surface unit.
    Notes: Untersuchungen an TiO2—V2O5-Mischoxidkatalytoren zeigen, daß Vanadium in Form von Vanadiumionen V4+ in das Rutilgitter eingebaut wird und sich außerdem als VO2+-Ion an der Oberfläche befindet. Die Konzentration der Oberflächenvanadylionen ist eine Funktion der auf die Oberfläche bezogenen V2O5-Konzentration.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693680103
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  • 7
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Mischoxidkatalysatoren. V. Cr2O3—TiO2 (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 368 (1969), S. 1-9 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-ray, ESR and magnetical investigations show that Cr3+ ions are incorporated into the TiO2 lattice at low Cr2O3 contents of Cr2O3—TiO2 oxide mixtures. At higher contents, compound and cluster formation occur. There is a partial oxidation of Cr3+, depending on the specific surface of the specimens.
    Notes: Röntgenographische, ESR- und magnetische Untersuchungen zeigen, daß bei geringen Cr2O3-Beimischungen Cr3+-Ionen in das TiO2-Gitter eingebaut werden. Bei höheren Konzentrationen tritt Verbindungs- und Clusterbildung auf. Die Oxydation der Cr3+-Ionen ist eine Funktion der Oberflächengröße.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693680102
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  • 8
    Electronic Resource
    Electronic Resource
    Halbleitung und Katalyse. VI. SO2-Oxydation an Cr2O3—ZrO2-Mischoxiden unter besonderer Berücksichtigung höherer Oxydationsstufen des Chroms (1969)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 370 (1969), S. 40-48 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The catalytic and electronic properties of Cr2O3—ZrO2 mixed oxides are dependent on the concentration of Cr5+ ions and the ratio Cr5+: Cr3+, respectively. The catalytic activity appears to be due to an electronic collision mechanism, while the observed lowering of the activation energy of electronic conductivity may be interpreted on the basis of a hopping-exchange process between Cr3+ and Cr5+.
    Notes: Die katalytischen und elektronischen Eigenschaften von Cr2O3—ZrO2-Mischoxiden werden von der Konzentration an Cr5+-Ionen bzw. von dem Verhältnis Cr5+/Cr3+ beeinflußt. Die katalytische Aktivität kann auf einen Elektronenstoßmechanismus zurückgeführt werden, während die Erniedrigung der Aktivierungsenergie der Leitfähigkeit durch einen Ladungsaustausch zwischen Cr3+ und Cr5+ interpretiert wird.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19693700105
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  • 9
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Cr2O3-Mischoxidkatalysatoren. II. CuO/Cr2O3 (1966)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 346 (1966), S. 66-75 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 12 mixed-oxide specimens of different molar compositions have been prepared from CuO and Cr2O3 and investigated by chemical, X-ray and ESR methods. 5 phases were established: CuO, Cr2O3, CuCr2O4, Cu2ICr2O4, and basic copper chromate(VI). ESR spectra in combination with chemical analyses allow to distinguish quantitatively between Cu(I) and Cu(II) chromates(III).
    Notes: CuO, Cr2O3 und 12 verschiedene Mischungen dieser beiden Oxide wurden hergestellt. Die Struktur der so erhaltenen Katalysatoren wurde chemisch, röntgenographisch und mittels ESR-Spektroskopie untersucht. Es wurden 5 Phasen ermittelt: CuO, Cr2O3, CuCr2O4, Cu2Cr2O4 und basisches Kupferchromat. Es wird eine Möglichkeit gezeigt, durch ESR-Spektren in Verbindung mit chemischen Analysen die Chromite des Cu(I) und Cu(II) quantitativ zu unterscheiden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19663460108
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  • 10
    Electronic Resource
    Electronic Resource
    Strukturuntersuchungen an Cr2O3-Mischoxidkatalysatoren. I. MgO/Cr2O3 und BeO/Cr2O3 (1966)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 346 (1966), S. 51-65 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: MgO/Cr2O3 mixed-oxide catalysts contain, depending on the preparation conditions and molar composition, in addition to a more or less ordered spinel phase the free starting oxides, small amounts of MgCrO4 (being important as an intermediate of the spinel formation), and Cr3+ on Mg2+ positions of different site symmetry.In the less complicated BeO/Cr2O3 system, besides BeCr2O4 and the starting oxides only small amounts of BeCrO4 occur which, however, is supposed to activate catalytically the spinel formation like MgCrO4.
    Notes: Es wird gezeigt, daß im System MgO/Cr2O3 unter den gewählten Darstellungsbedingungen je nach Zusammensetzung neben einer mehr oder weniger geordneten Spinellphase die freien Ausgangsoxide, sehr kleine Mengen an MgCrO4, das eine sehr entscheidende Rolle als Zwischenprodukt bei der Spinellbildung spielt, sowie auf Mg2+-Gitterplätzen befindliches Cr3+ mit verschiedener Punktsymmetrie existieren.Einfacher liegen die Verhältnisse im System BeO/Cr2O3. Neben BeCr2O4 und den Ausgangsoxiden BeO und Cr2O3 enthalten diese Substanzen nur geringe Mengen an BeCrO4, das bei der Spinellbildung sicherlich die gleiche katalytische Rolle wie das MgCrO4 bei der MgCr2O4-Bildung spielt, nämlich die Aktivierungsenergie der Spinellbildung herabzusetzen.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19663460107
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