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  • 2000-2004  (26)
  • 1990-1994  (45)
  • 1
    Digitale Medien
    Digitale Medien
    The perils of peer review (2001)
    [s.l.] : Nature Publishing Group
    Nature 414 (2001), S. 393-394 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Sir Your News feature “Peers under pressure” (Nature 413, 102–4; 2001) on the hoary old chestnut of peer review reinforces my decades-old comparison of this ritual to the Latin mass. Obviously many ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35106722
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  • 2
    Digitale Medien
    Digitale Medien
    Microwave-Assisted Synthesis and Sintering of NZP Compounds (2004)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: We have identified the high microwave susceptibility of the sodium di-hydrogen phosphate monohydrate (NHPM), NH2PO4·H2O. This acid phosphate of sodium can be heated to 〉900°C when exposed to 2.45 GHz microwave radiation. Using NHPM and microwave energy, a novel single-step synthesis of many important crystalline NZP compounds has been accomplished in a very short time. Interestingly, the combination of microwaves and nonstoichiometric oxide precursors for the preparation of NZP materials is found to reduce the reaction temperatures and enhance the reaction kinetics further. The microwave synthesis method is found to be simple and fast, minimizing the loss of volatile chemical species from the reaction. A microwave-assisted procedure for the rapid sintering of NZP compounds has also been demonstrated. Densification (〉97%) has been achieved in 〈30 min at sintering temperature much lower than normally required in conventional processes. Finer microstructure and better densification are the main advantages of the microwave sintering in this study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.00834.x
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  • 3
    Digitale Medien
    Digitale Medien
    Sintering of Zirconia Nanopowder by Microwave-Laser Hybrid Process (2004)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: A new hybrid sintering process has been developed by replacing all but one laser by microwaves in the existing simultaneous multiple laser process (SIMPLE). Microwave energy has been used to preheat the material before laser radiation, and the synergism between microwave and laser energies could effectively heat the material to temperatures of 1700°C and beyond in just a few minutes. Using this process, rapid sintering of 3Y–ZrO2 (3Y–TZP) pellets has been achieved in a few minutes. Microstructural investigations reveal that the microwave–laser hybrid sintered pellets of 3Y–ZrO2 have nanograins averaging about 20 nm. The microwave–laser hybrid sintering process can clearly be a new approach for fabrication of nanoceramics and nanocomposites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1551-2916.2004.01806.x
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  • 4
    Digitale Medien
    Digitale Medien
    Preparation of Titanium Nitride: Microwave-Induced Carbothermal Reaction of Titanium Dioxide (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: Carbothermal reduction and nitridation of TiO2 was performed in a 2 kW, 2.45 GHz microwave furnace. Carbon, generally added for the removal of oxygen from TiO2 lattice also served as the low-temperature susceptor in these experiments. At temperatures 〉1200°C, the mixtures started reacting vigorously (self-burn), which was never observed with the respective pure compounds. In the self-burning state, the minimum duration required for complete titanium nitride transformation was ∼20 min with stoichiometric amounts of carbon. With excess C, the transformation duration dropped to just 1 min. CO removal and subsequent Ni fixation occur more directly in microwave-induced reactions than in conventional nitridation procedures. Intermediate formation of successive Magneli phases (Ti2nO2n−1) was not found in the microwave-induced reactions. The combination of microwave processing and combustion makes this route of economical interest.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00051.x
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  • 5
    Digitale Medien
    Digitale Medien
    Anisotropic growth of single-crystal graphite plates by nickel-assisted microwave-plasma chemical-vapor deposition (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1125-1127 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Growth of single-crystal graphite free-standing plates has been achieved by a microwavehydrogen-plasma etching of graphite powder and nickel mesh. The plates resemble a knife blade and grow in the 〈11¯00〉 direction with long crystals exceeding 100 μm. Hexagonal growth features at the edges and electron diffraction patterns confirm the single-crystal nature of these ultrathin plates. Electron microprobe and Raman spectroscopy indicate the presence of graphite. Diamond crystals nucleate on these plates and they grow simultaneously. We suggest that the paradoxical growth of graphite in a hydrogen plasma, under conditions in which graphite is usually etched away, is possible because of a protective coating by a Ni–C–H phase. This thin coating allows for transport of carbon atoms from the gas phase to the growing graphite surface. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.125958
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  • 6
    Digitale Medien
    Digitale Medien
    Microwave Effects in Lead Zirconium Titanate Synthesis: Enhanced Kinetics and Changed Mechanisms (2001)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 84 (2001), S. 0 
    Details
    ISSN: 1551-2916
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Maschinenbau , Physik
    Notizen: A novel, simple, and fast solid-state procedure has been demonstrated for the synthesis of Pb(Zr,Ti)O3 (PZT), using microwave radiation. The process consists of starting with the respective oxides mixed in the required proportions and exposing the charge to the microwaves. By making one or more of the constituent oxides slightly nonstoichiometric, enormous enhancement in reaction rates has been achieved, and single-phase PZT can be synthesized at temperatures as low as 600°C. Moreover, it has been shown that the combined use of nonstoichiometric precursors and microwave irradiation leads to different reaction pathways for the formation of PZT. Further, the microwave method diminishes PbO loss.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1151-2916.2001.tb00816.x
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  • 7
    Digitale Medien
    Digitale Medien
    Bulk synthesis and selective exchange of strontium ions in Na 4 Mg 6 Al 4 Si 4 O 20 F 4 mica (1992)
    [s.l.] : Nature Publishing Group
    Nature 357 (1992), S. 571-573 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Environments containing the radionuclide 137Cs can be suc-cessfully decontaminated through the use of a highly selective caesium ion sieve made by topotactic leaching of a naturally occurring phlogopite mica16'17. This material was found to be far superior to other naturally occurring and ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/357571a0
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  • 8
    Digitale Medien
    Digitale Medien
    Apologies to Bianconi (1992)
    [s.l.] : Nature Publishing Group
    Nature 359 (1992), S. 472-472 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - National science policy has been a primary focus of mine fpr many years. It is a subject to which I have dedicated considerable time and energy. The issue of overselling science is an issue in national science policy that deserves not only mine but others' time and energy. Over the past year, ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/359472a0
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  • 9
    Digitale Medien
    Digitale Medien
    Rustum Roy replies (1991)
    [s.l.] : Nature Publishing Group
    Nature 354 (1991), S. 9-9 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SIR - You take a whole page in News and Views (Nature 351, 13; 1991) to advance a case that I am "making a mountain of a molehill" without providing your readers with any factual background on the "issue". Your attack is full of errors and misinterpretations. At the request of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/354009b0
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  • 10
    Digitale Medien
    Digitale Medien
    The literature and its neglect: Review papers can help (2000)
    Springer
    Materials research innovations 4 (2000), S. 1-2 
    Details
    ISSN: 1433-075X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100190000070
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