Results 221 to 230 of about 847,301 (279)

Ultrasonic relaxations in borate glasses

Materials Science and Engineering: A, 2004
The attenuation and velocity of ultrasonic waves of frequencies in the range from 10 to 70MHz have been measured in M2O–B2O3 borate glasses (M: Li or Ag) as a function of temperature between 15 and 350 K. The velocity of sound waves decreases with increasing temperature in all the glasses, the decrease as the temperature is increased is larger in ...
D'ANGELO, Giovanna, TRIPODO, Gaspare, CARINI, Giuseppe, E. COSIO, A. BARTOLOTTA, G. DI MARCO   +5 more
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Molecular dynamics of a silver borate glass

Journal of Non-Crystalline Solids, 1986
Etude par calcul de dynamique moleculaire des verres Ag 2 O-, 9B 2 O 3 afin de confirmer les hypotheses anterieures et d'indiquer la localisation des ions argent dans les interstices du reseau, pres des atomes d'oxygene.
ABRAMO, Maria Concetta, CARINI, Giuseppe, PIZZIMENTI, Giovanni   +2 more
openaire   +3 more sources

Structure of Borate Glasses

Journal of the American Ceramic Society, 1957
Anomalous thermal expansion and other properties of borate glasses have previously been given a structural explanation by Abe. This explanation is here reinterpreted and revised in terms of the structon theory of Huggins. In agreement with Warren, it is postulated that, in glasses containing, in addition to boric oxide, small relative amounts of an ...
MAURICE L. HUGGINS, TOSlO ABE
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The structure of borate glass

Glass and Ceramics, 2008
The existing hypotheses on the structure of alkali borate glass were comprehensively analyzed. Their imperfection in explaining the dependences of the properties of the glasses on their composition was noted. Alternative schemes of structural borate complexes which more convincingly explain the characteristics of the change in the properties of this ...
N. A. Minakova, A. V. Zaichuk, Ya. I. Belyi   +2 more
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On the connectivity of borate tetrahedra in borate and borosilicate glasses

Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B, 2015
In borosilicate glasses, not only the question of the fraction of four- and three-fold coordinated boron deserves special consideration, but also the connectivity of the tetrahedral and trigonal borate groups with each other and with the silicate network. Older structural studies and models of borate and borosilicate glasses often
Möncke, D., Tricot, G., Winterstein-Beckmann, A., Wondraczek, L., Kamitsos, E.   +4 more
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EXAFS on Silver Borate Glasses

1984
Fast ion transport properties in crystalline and amorphous solids have been widely studied in the last years. In particular, new glasses have been produced, exhibiting a conductivity due to alkali or silver ions much higher than the corresponding crystalline compounds.
Fornasini, Paolo, Dalba, Giuseppe, F. Rocca, E. Bernieri, E. Burattini   +4 more
openaire   +2 more sources

Determination of gadolinium in sodium borate glasses

Talanta, 1970
A method for the determination of gadolinium in sodium borate glasses is described which utilizes the 312-nm fluorescence of gadolinium under 273-nm excitation. A linear dependence of fluorescence on concentration is found for the concentration range 10-20000 ppm. Quenching of gadolinium fluorescence by samarium is examined.
R, Reisfeld, E, Biron
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Thermoluminescence of Borate Glass Containing Copper

Radiation Protection Dosimetry, 1983
Abstract Thermoluminescence (TL) of X ray irradiated borate glass containing copper (0.01 to 1.0 mol%) has been studied. Samples were made from mixtures of B2O3 and CuCl2. They were melted at 1100 oC for 1 hour in a platinum crucible followed by annealing in a brass mould.
Y. Fukuda, T. Okuno, N. Takeuchi
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Properties and Structure of Lithium Borate and Strontium Borate Glasses

Journal of the American Ceramic Society, 1982
Experimental results for some physical properties of Li 2 O‐B 2 O 3 and SrO‐B 2 O 3 glasses with high modifier content showed ...
Y. OHTA, M. SHIMADA, M. KOIZUMI
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The glass transition temperature of silicate and borate glasses

Journal of Non-Crystalline Solids, 2005
The dependence of the glass transition temperature on silicate composition as well as on borate composition is discussed. Some new experimental results on borosilicate glass-enamels are put together with the existing literature data. It is demonstrated that in the glass transition interval the activation energy E(Tg) for viscous flow is related to the ...
I. Avramov, Ts. Vassilev, I. Penkov
openaire   +1 more source