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  • High-performance ceramics  (1)
  • Hydrogen plasmas  (1)
  • Inorganic Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Plasma-assisted CVD of cubic boron nitrideThis work was supported by the European Commission, Contract ERBIC15CT960707. The authors thank Mr. H. Labitzke, Mr. K. Röhm, Mr. W. Gielen (MPI für Metallforschung) and Mr. A. Breitschwerdt (MPI für Festkörperforschung) for their participation in the work presented here. (1997)
    Weinheim : Wiley-Blackwell
    Chemical Vapor Deposition 3 (1997), S. 239-255 
    Details
    ISSN: 0948-1907
    Keywords: Cubic boron nitride ; Plasma-assisted CVD ; Diamond CVD ; Hydrogen plasmas ; Characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Single-phase cubic boron nitride films of high quality might be of great importance as superhard wear-resistant coatings and semiconductive materials. This paper reviews deposition techniques, precursors, deposition parameters and substrates employed in plasma-assisted CHEMICAL VAPOR DEPOSITION (PACVD) of cubic boron nitride (c-BN) as well as procedures applied for the characterization of c-BN-containing films. Mechanisms of the formation of sp3-hybridized boron nitride during PACVD by use of either high-energy nitrogen and argon ions or hydrogen plasmas are discussed. All experimental results on PACVD of c-BN are thought to fit either “physical” or “chemical” routes for c-BN low-pressure synthesis, which are based on principles of c-BN physical vapor deposition or diamond CVD.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cvde.19970030502
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  • 2
    Electronic Resource
    Electronic Resource
    Synthese und Charakterisierung eines neuen gemischten Titan-Aluminium-Alkoxids (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1163-1167 
    Details
    ISSN: 0044-2313
    Keywords: Titanium-Aluminium Alkoxide ; Aluminium Titanate (Tialite) ; Ceramics Precursor ; X-Ray Structure Determination ; 1H/13C-NMR (2 D) ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Structural Characterization of a Novel Titanium-Aluminium AlkoxideThe novel Ti-Al-Alkoxide TiAl2(OiPr)10, was synthesized from aluminium turnings and titanium tetraisopropoxide in 2-propanol and isolated by subsequent fractionating distillation. Colourless prismatic crystals precipitated after 24 h at 20°C from the main fraction. They proved very moisture sensitive. The compound crystallizes in the monoclinc space group C2/c (no. 15) with a = 2303.1(4), b = 1097.2(3), c = 1685.0(3) pm, β = 104.32(1)° and Z = 4. The molecular structure exhibits a bent Al-Ti-Al′ unit, in which Al shows tetrahedral, but Ti octahedral1 coordination. The polyhedra are connected via cis-edges of the octahedron. The structure of the compound in solution was determined by NMR spectroscopy (1H, 13C, COSY) and proved to be identical to the structure in the solid state.
    Notes: Das neue Ti-Al-Alkoxid TiAl2(OiPr)10 wurde durch Umsetzung von Al-Spänen mit Titantetraisopropoxid in Isopropanol und anschließender fraktionierender Destillation dargestellt. Die nach 24 h bei 20°C aus der Hauptfraktion gebildeten farblosen, prismatischen Kristalle sind sehr hydrolyseempfindlich. Die Kristallstruktur konnte bei -83°C bestimmt werden: monokline Raumgruppe C2/c (Nr. 15) mit a = 2303,1(4), b = 1097,2(3), c = 1685,0(3) pm, β = 104,32(1)° und Z = 4. Die Molekülstruktur besteht aus einer gewinkelten Al-Ti-Al′-Einheit, in der Al tetraedrisch und Ti oktaedrisch koordiniert sind. Die verknüpfenden Kanten am Ti-Oktaeder sind cis angeordnet. Die Struktur der Verbindung in Lösung wurde NMR-spektroskopisch (1H, 13C, COSY) ermittelt und stimmt mit der Struktur im Einkristall überein.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230726
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  • 3
    Electronic Resource
    Electronic Resource
    The Importance of Chemistry in the Development of High-Performance CeramicsDedicated to Professor Heinz Harnisch on the occasion of his 60th birthday (1987)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 26 (1987), S. 371-381 
    Details
    ISSN: 0570-0833
    Keywords: High-performance ceramics ; Ceramics ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Due to their mechanical, thermal and chemical stability, high-performance ceramics have a range of properties which makes it possible in many fields to go beyond the limits of use of the various classes of materials nowadays available. In spite of this favorable starting situation, the worldwide endeavors to introduce this new group of materials have suffered some setbacks in both conventional applications and in new technologies. The ultimate reason is that these materials are very brittle. After the introduction of fracture mechanics, designers in many fields have learned how to handle brittle materials and how to exploit the potential of their properties in components subject to extreme loadings. Materials scientists have also been very successful in developing ceramics with high strength and fracture toughness characteristics. Nevertheless, the field of use has hitherto been restricted, since, in many cases, the reliability of the components is inadequate. Small and very small defects, such as micropores and cracks, as well as any other chemical and physical inhomogeneity in the structure can cause catastrophic failure of the components due to the high brittleness. Since, on the one hand, these defects are as a rule caused by inadequate control of the process sequences and, on the other, the production processes comprise a large number of chemical process steps, it is to be hoped that consistent application of the way of thinking and procedures of a chemist will make an important contribution in overcoming these difficulties.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198703713
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