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2000 (1)
1998 (1)
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1Author    Hiroki Fujimori, Tetsuo AsajiRequires cookie*
 Title    CI NQR in Glassy Crystal of 2-chlorothiophene  
 Abstract    Stable crystalline 2-chlorothiophene has two glass transitions at 164 and 186 K. 35 CI NQR measurements were carried out between 77 and 200 K. Two NQR signals with full widths of about 100 kHz at half maximum were observed in this temperature range. The spin-lattice relaxation times Ti were measured at the two peak frequencies. The activation energy obtained from the results of the T\ measurements showed a fairly good agreement with those estimated from calorimetric measurements. 
  Reference    Z. Naturforsch. 55a, 183—185 (2000); received October 13 1999 
  Published    2000 
  Keywords    NQR, 2-chlorothiophene, Glassy Crystal, Glass Transition 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0183.pdf 
 Identifier    ZNA-2000-55a-0183 
 Volume    55 
2Author    J. Reuter, T. Brückert, A. WürflingerRequires cookie*
 Title    Differential Thermal Analysis under Pressure on Cyanocyclohexane, 1,2,3,4-Tetrahydro-5,6-dimethyl-1,4-methanonaphthalene, and 2-Methyl-2-propanol  
 Abstract    Differential thermal analysis has been performed on cyanocyclohexane (CCH), 1,2,3,4-tetrahydro-5,6-dimethyl-1,4-methanonaphthalene (TDMN), and 2-methyl-2-propanol (t-butanol) up to 300 MPa. The latter compound was also investigated dielectrically. CCH displays an ODIC phase that transforms only reluctantly to the low-temperature stable phase II. Annealing under pressure can appreciably accelerate this transformation. For all three compounds the phase diagrams were established. For CCH and TDMN also the pressure dependence of the glass transition has been determined. 
  Reference    Z. Naturforsch. 48a, 705—708 (1993); received March 10 1993 
  Published    1993 
  Keywords    High pressure, DTA, Phase transitions, Glass transition, Dielectric constant 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0705.pdf 
 Identifier    ZNA-1993-48a-0705 
 Volume    48 
3Author    G. Herms, J. Sakowski, W. Gerike, Dörte StachelRequires cookie*
 Title    Structural Changes in Two Different Types of Oxide Glass Melts: Borates and Metaphosphates  
 Abstract    X-ray diffraction experiments of molten oxide glasses, which give new insights into the structure of melts, were carried out. Using modern means (synchrotron radiation, image plates, container-less high-temperature technique) it could be shown that the short range order of melt and solid glass is often qual-itatively different. If vitreous B 2 0 3 or binary borate glasses with low content of network modifier are heated up above T & , the network topology begins to alter. With rising temperature more and more of the boroxol groups are replaced by independent B0 3 groups. While melting a metaphosphate glass, how-ever, structural changes of another kind take place. In solid glass the environment of the network mod-ifier ions is similar to the one found in crystalline modifications, and their distances to the surrounding P0 4 tetrahedra have narrow distributions. In the melt, however, these distances scarcely become evi-dent, probably owing to the increased thermal motion of the modifier ions. 
  Reference    Z. Naturforsch. 53a, 874—882 (1998); received February 17 1997 
  Published    1998 
  Keywords    X-ray Diffraction, Short Range Order, Borate Glasses, Phosphate Glasses, Glass Transition 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0874.pdf 
 Identifier    ZNA-1998-53a-0874 
 Volume    53