Results 231 to 240 of about 847,301 (279)
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Gradient index in borate glasses
SPIE Proceedings, 1994ABSTRACTA number of aluminum—borate glasses has been developed for producing gradient index glasses by exchang-ing. Both positive and negative axial grandient were fabracated in the glasses by exchange of Li+ for Na+ and Na+ for Li , respectively. Index change to 0.
Yunan Sun +2 more
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Crystallization of lithium borate glasses
Journal of Materials Science, 1992The glass-forming ability and crystallization behaviour of lithium borate compositions, in the diborate to metaborate range, were studied. In particular, the nature and sequence of formation of crystalline phases and the tendency towards devitrification were investigated as functions of temperature, thermal history and batch composition.
A. Aydin Goktas +2 more
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Kinetic study of crystallization of borates and borate glasses
Journal of Alloys and Compounds, 1996Abstract The kinetics of the multistage crystallization of amorphous borates and alkali- and alkaline-earth-borate glasses obtained by melting oxide mixtures has been studied. The amorphized borates: colemanite Ca 2 B 6 O 8 (OH) 6 ·2H 2 O, pandermite Ca 2 B 5 O 8 (OH) 3 ·2H 2 O, kaliborite HKMg 2 B 12 O 16 (OH) 10 ·4H 2 O, kernite Na 2 B 4 O 6 (OH ...
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Journal of the American Ceramic Society, 1984
The glass‐forming regions for the sodium borate system were determined using a roller‐quencher. The new regions are R=0 to 0.8 and R=1.2 to 4.9for samples prepared from sodium carbonate (where R=mol% Na 2 O/mol% B 2 O 3
JamesE. Kasper +3 more
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The glass‐forming regions for the sodium borate system were determined using a roller‐quencher. The new regions are R=0 to 0.8 and R=1.2 to 4.9for samples prepared from sodium carbonate (where R=mol% Na 2 O/mol% B 2 O 3
JamesE. Kasper +3 more
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The Rheology of Alkali Borate Glasses
1974A survey is given of the recent work in the Department of Inorganic Chemistry of the Eindhoven University of Technology on the rheological properties of alkali borate glasses.
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1978
One of the first factory produced boro-silicate glasses was made by Maes in Clichy, France around 1850. It was a glass one would call today a “boro-silicate crown” and its composition, according to an analysis reported by E. Zschimmer [1], was 56% silica, 7% boric acid, 17% potassia, 2% calcia, 14% zinc oxide, 4% lead oxide. Articles made of this glass
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One of the first factory produced boro-silicate glasses was made by Maes in Clichy, France around 1850. It was a glass one would call today a “boro-silicate crown” and its composition, according to an analysis reported by E. Zschimmer [1], was 56% silica, 7% boric acid, 17% potassia, 2% calcia, 14% zinc oxide, 4% lead oxide. Articles made of this glass
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Analysis of water in borate glasses
Journal of Non-Crystalline Solids, 1972A method capable of fairly accurate determination of the water content (<1 mole%) in borate glasses has been developed. It is based on the principle, that when a glass sample is melted in an evacuated tube, the water leaves the sample thereby producing a water vapour pressure from which the water content of the glass can be calculated.
Visser, T.J.M., Stevels, J.M.
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Luminescence Of Lanthanum Borate Glasses
SPIE Proceedings, 1989The luminescence of several rare-earth ions a s2 ion and a transition metal ion in lanthanum borate glass are investigated and compared with the luminescence of these ions in crystals of composition LaB3O6,with a special stress on the transitions of the broad-band type.
J. W. M. Verwey, G. Blasse
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1978
Early in 1975, Norbert Kreidl approached me for my opinion on the topic and novel format which he was considering for the Fifth “Rolla” Ceramic Materials Conference.* The theme was to be borate glass structures, and part of the motivation was to produce a volume of original papers on the subject which could be dedicated as a “festschrift” in memory of ...
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Early in 1975, Norbert Kreidl approached me for my opinion on the topic and novel format which he was considering for the Fifth “Rolla” Ceramic Materials Conference.* The theme was to be borate glass structures, and part of the motivation was to produce a volume of original papers on the subject which could be dedicated as a “festschrift” in memory of ...
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Glass Formation in Borate Systems
1978Glass formation achieved by quenching a melt is a fundamental material property associated with a number of independent variables: composition, melt volume, type of quench, quench temperature and melt history1. Collectively, these variables combine to yield a quench rate which may or may not be sufficient for a given melt to suppress crystallization ...
L. D. Pye, V. D. Fréchette, D. E. Rase
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