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  • 1
    Electronic Resource
    Electronic Resource
    Vibrational spectra of B2O3—GeO2—SiO2 glasses (1986)
    Springer
    Journal of materials science 5 (1986), S. 361-364 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01748107
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Critical remarks on “Determination of reaction kinetic parameters from variable temperature DSC or DTA” (1986)
    Springer
    Journal of thermal analysis and calorimetry 31 (1986), S. 177-182 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A critical assessment of a published paper (by Bansal and Doremus) is presented. The non-validity of an equation derived by them to calculate the kinetic parameters for the crystallization of fluoride glasses is first reviewed. Then the question of the correct mathematical form is addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01913899
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  • 3
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    Unknown
    Structure-property relations in lanthanide borate glasses (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Glass formation in the system Ln2O3-B2O3 (Ln = Nd, Sm) was studied. Glasses could be formed in the range from 0 to 28 mol pct rare-earth oxide (Ln2O3), but liquid immiscibility in these systems limits the range of homogeneous glasses to 0 to 1.5 and 25 to 28 mol pct Ln2O3. The infrared spectra indicate that the rare-earth-rich glasses are structurally similar to rare-earth metaborates (LnB3O6) which contain (B3O6)-infinity chains. The variation in density, transformation temperature, thermal expansion coefficient, and transformation-range viscosity of these glasses with the size of the rare-earth ion is discussed. Glasses near the metaborate composition have a transformation temperature of about 700 C, which is high for binary borate glasses. Glasses could not be formed in the systems Eu2O3-, Gd2O3-, Ho2O3-, and Er2O3-B2O3, even by quenching at 1300 C/s. The sudden lack of glass formation in the system Ln2O3-B2O3 with Ln(3+) ions smaller than Sm(3+) is explained on the basis of the size effect of the Ln(3+) ion on the stability of (B3O6)-infinity chains in these metaborates.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society, Journal (ISSN 0002-7820); 68; 368-371
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Effect of R(3+) ions on the structure and properties of lanthanum borate glasses (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The present investigation of glass formation in the (mole percent) systems 25La2O3 (x)R2O3 (75-x)B2O3, where R = Al, Ga, and (25-x)La2O3 (x)Ln2O3 75B2O3, where Ln = Gd, Er, Y, notes that up to 25 mol pct Al2O3 or Ga2O3 can be substituted for B2O3, while no more than about 5 mol pct Ln2O3, substituted for La2O3, caused macro-phase separation. The substitution of either R2O3 or Ln2O3 in the lanthanum borate system changes the separation distance between adjacent B3O6 chains. The effect of this structural change on the molar volume, transformation temperature, thermal expansion coefficient, and transformation-range viscosity is discussed.
    Keywords: NONMETALLIC MATERIALS
    Type: American Ceramic Society, Journal (ISSN 0002-7820); 68; 641-645
    Format: text
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    NASA TECHNICAL REPORTS
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