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  • 1
    Electronic Resource
    Electronic Resource
    ‘Ea-δ Rule‘ Discovered from the Crystallization Study of Gallate and Vanadate Glasses (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 90-91 (Apr. 2003), p. 247-252 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.90-91.247.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Mössbauer study on the crystallization of IR-transmitting aluminate glasses (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 239 (1999), S. 303-307 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Heat treatment of 60CaO·10BaO·17Al2O3·13Fe2O3 glass causes a precipitation of the nanoparticles of antiferromagnetic Ca2Fe2O5 and ferromagnetic BaFe2O4. Mössbauer spectra of these glass-ceramics show a magnetic relaxation spectra superimposed on doublets. A Kissinger plot in the DTA method reveals that simultaneous cleavage of Ca-O and Fe-O bonds and that of Ba-O and Fe-O bonds cause the precipitation of Ca2Fe2O5 and BaFe2O4, respectively. Introduction of Fe(III) promotes the crystallization of aluminate glass. In the case of iron-free 60CaO·10BaO·30Al2O3 glass, Ca2Al2O5 and BaAl2O4 particles precipitate instead of Ca2Fe2O5 and BaFe2O4 particles, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349501
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  • 3
    Electronic Resource
    Electronic Resource
    Application of the “Tg-Δ rule” to the local structural study of ferrate glasses (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 239 (1999), S. 237-240 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A linear relationship exists between the glass transition temperature (T g) and the quadrupole splitting (Δ) of Fe(III). The linear relationship, termed ‘T g-Δ rule’, has been verified in 60CaO·(40-x)Al2O3·xFe2O3, 60CaO·10BaO·(30-x) Al2O3·xFe2O3, 60CaO·(40-x)Ga2O3·xFe2O3, and 50CaO·(50-x)Ga2O3·xFe2O3 glasses. In these glasses, both theT g and Δ decrease linearly with an increasing content of Fe2O3 (≈40 mol%). The slope of the straight line, obtained from the plot of theT g vs. Δ, was calculated to be 670≈700, °C/(mm·s−1), revealing that the Fe(III) constitutes the skeleton of aluminoferrate and galloferrate glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349489
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  • 4
    Electronic Resource
    Electronic Resource
    Substitution of Fe(III) for Ga(III) in calcium gallate glass confirmed from the Debye temperature (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 237 (1998), S. 47-50 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A Debye temperature θD of 378 (±5K) has been obtained by applying a simplified Debye model to the57Fe Mössbauer spectra of 60CaO·39Ga2O3·57Fe2O3 glass. The θD value is comparable to those (280–580 K) obtained so far in several oxide glasses, glass-ceramics, and ceramics in which Mössbauer atoms are covalently bonded to oxygen atoms and play a role of network former. It proves that Fe(III) atoms occupy the substitutional sites of Ga(III) constituting distorted GaO4 tetrahedra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386660
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Fe2O3 Content on the Local Structure and Crystallization Mechanism of Calcium Gallate Glasses (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 246 (2000), S. 43-49 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract 57Fe Mössbauer and FT-IR of 60CaO·(40-x)Ga2O3·xFe2O3 glasses revealed that Fe(III)O4 tetrahedra occupy substitutional sites of Ga(III)O4 tetrahedra. The activation energy for crystallizaation (E a) obtained from DTA study decreases distinctly from 8.9 to 4.8 eV with an increase in the Fe2O3 content. In the case of 40CaO·(60-x)Ga2O3·xFe2O3 glasses, a week doublet due to Fe(II)O4 tetrahedra or Fe(III)O6 octahedra was observed in addition to Fe(III)O4 tetrahedra. The E avalue decreases gradually from 7.1 to 5.6 eV with an increasing Fe2O3 content. These results indicate that a large amount of Fe2O3 in the network structure is favorable for the crystallization of calcium gallate glass, since it reduces the chemical bond strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006760426630
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  • 6
    Electronic Resource
    Electronic Resource
    57Fe Mössbauer, XRD and DTA Study of the Crystallization Behavior of Calcium Aluminate Glass Containing Iron(III) (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 246 (2000), S. 51-56 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract 57Fe Mössbauer spectroscopy was applied to the crystallization study of IR-transmitting calcium aluminate glass, 60CaO·32Al2O3·5Fe2O3·3Eu2O3, in which Fe(III) atoms occupy tetrahedral Al(III) sites. Heat treatment of calcium aluminate glass below and above the crystallization temperature causes the formation of mayenite, 12CaO·7Al2O3, and brownmillerite, 4CaO·Al2O3·Fe2O3, respectively. Mössbauer spectra of the glass ceramics indicate that Fe(III) atoms substitute Al(III) sites, having less covalent Fe(III)-O bonds and more distorted Fe(III)O4 tetrahedra than they do in the original glass. DTA revealed that crystallization of calcium aluminate glass is triggered by simultaneous cleavage of Ca-O and Al-O bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006764510701
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  • 7
    Electronic Resource
    Electronic Resource
    Laser- and gamma-ray induced crystallization of IR-transmitting calcium gallate glass (1994)
    Springer
    Hyperfine interactions 94 (1994), S. 2125-2130 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ar+-laser (λ=488 nm) irradiation of calcium gallate (CG) glass with the composition of 60CaO·39Ga2O3·Fe2O3 resulted in a distinct decrease in the IR transmittance (T) due to the formation of crystalline CaGa2O4 and CaGa4O9 phases. The Mössbauer spectrum of non-irradiated glass comprised a broad doublet due to distorted Fe3+(Td) withδ, Δ, andΓ of 0.20, 1.33, and 1.00 mm s−1, respectively. An additional doublet due to Fe3+(Td) was observed in the Ar+-irradiated glass andδ, Δ, andΓ were 0.17, 1.32, and 0.75 mm s−1, respectively. A decrease inT was also observed after the60Co γ-ray irradiation with doses ≥105Gy, and the precipitation of CaO, Ga2O3, and CaGa4O7 phases was confirmed by X-ray diffraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063750
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