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'Borate Glasses' in keywords Facet   section ZfN Section A  [X]
Facet   Publication Year 1998  [X]
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1Author    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