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  • 1
    Electronic Resource
    Electronic Resource
    Highly stereo- and regioselective formation of 2-oxazolone telomers, potential synthetic intermediates for amino sugars (1982)
    s.l. : American Chemical Society
    The @journal of organic chemistry 47 (1982), S. 4291-4297 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00143a024
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  • 2
    Electronic Resource
    Electronic Resource
    Porous Glass-Ceramics with Bacteriostatic Properties in Silver-Containing Titanium Phosphates: Control of Release of Silver Ions from Glass-Ceramics into Aqueous Solution (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Porous glass-ceramics with the surface phase consisting predominantly of AgTi2(PO4)3 crystal and the interior phase of LiTi2(PO4)3 crystal are prepared by exchange of Ag+ions for Li+ions. In the present work, the release of Ag+ ions from glass-ceramics into aqueous solutions was investigated. Exchanged Ag+ ions were chemically stable in water. The as-exchanged glass-ceramics released Ag+ ions of 3045 equiv/g into phosphate buffer solution containing Na+ ions. X-ray diffraction analysis showed that silver-containing titanium phosphate crystalline phase in the glass-ceramics did not deteriorate even by heating at 900°C. The amount released from the heated glass-ceramics into the buffer solution was found to decrease drastically by 1–2 μequiv/g. The heated glass-ceramics showed excellent bacteriostatic properties. Glass-ceramics are expected to be novel bacteriostatic materials which have high thermal resistance and are medically safe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02898.x
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of Porous Glass-Ceramics with a Skeleton of NASICON-Type Crystal CuTi2(PO4)3 (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A novel porous glass-ceramic with a skeleton of CuTi2(PO4)3 was prepared by controlled crystallization of a glass and subsequent chemical leaching of the resulting dense glass-ceramic. A volume-crystallized dense glass-ceramic composed of CuTi2(PO4)3 and Cu3(PO4)2 whose surface was covered by a CuO thin layer was prepared by reheating a glass with a nominal composition of 50CuO·20TiO230P2O5 (in mol%) glass in air. When the resultant glass-ceramic was leached with dilute H2SO4, Cu3(PO4)2 and CuO phases were dissolved out selectively, leaving a crystalline CuTi2(PO4)3 skeleton. The specific surface area and the average pore radius of the porous glass-ceramic obtained were approximately 45 m2g-1 and 9 nm, respectively. The porous glass-ceramic showed catalytic activity in the conversion reaction of propene into acrolein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb02910.x
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  • 4
    Electronic Resource
    Electronic Resource
    Fluorescence properties of Sm2+ ions in silicate glasses (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 409-414 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fluorescence properties of Sm2+ ions incorporated in silicate glasses were investigated using steady-state and laser-induced line narrowing techniques. Sm2+ ions were incorporated in the glass matrix by heating the Sm3+ ion-containing glasses in H2 gas. The reaction of Sm3+ into Sm2+ was accelerated with increasing temperature. The fluorescence intensity of the Sm2+ ions increased with heating to 800 °C. Further heating above 900 °C precipitated mullite crystals. Accordingly, the fluorescence intensity of the Sm2+ ions abruptly decreased and the fluorescence of Sm3+ ions again appeared. Sm2+ ions are preferentially coordinated with Al–O polyhedrons. The crystallization of mullite induces the decrease in Al2O3 content in the remaining glassy phase, resulting in the redox equilibrium producing the high valence samarium ion. Three Stark splitting fluorescence peaks of the 5D0→7F1 transition were analyzed to determine the parameters of the crystal field surrounding the Sm2+ ion. The decrease in the number of Al–O bonds surrounding Sm2+ causes the Sm2+ ions' coordination number to decrease with the short distance of the Sm–O bonds. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362770
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  • 5
    Electronic Resource
    Electronic Resource
    Fluorescence spectroscopy of silicate glasses codoped with Sm2+ and Al3+ ions (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 6351-6356 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fluorescence properties of Sm3+ and Sm2+ ions incorporated in silicate glasses were measured using steady-state and laser-induced line narrowing techniques and the effect of Al3+ ions to the local structure around the Sm2+ ion was investigated. Sm3+ ion-containing glasses prepared by a sol–gel method were reacted with H2 gas to form the Sm2+ ions. The energies of the three Stark levels of the 5D0→7F1 transition were analyzed using C2v symmetry. The addition of Al3+ ions facilitates dispersion of the Sm2+ ions and increases the coordination number of the Sm2+ ion due to the long distance between the Sm2+ and O2− ions, resulting in the increased fluorescence intensity. The fluorescence intensity of the Sm2+ and Sm3+ ions considerably increases in glasses containing more than 5 mol % Al2O3. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364370
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  • 6
    Electronic Resource
    Electronic Resource
    Enhanced emission from Eu2+ ions in sol-gel derived Al2O3–SiO2 glasses (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3776-3778 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Eu2+ ions were incorporated in SiO2 and Al2O3–SiO2 glasses using a sol-gel process of Si(OC2H5)4, Al(OC4H9sec)3, and EuCl3 6H2O. Glasses incorporated with the Eu2+ ions showed the emission with peak at ∼22000 cm−1 due to 4f 6 5d→4f 7(8S7/2) transition of the Eu2+ ions. 1Al2O3⋅99SiO2 (mol %) glass had an intense emission, 250 times larger than that of 100SiO2 glass. The covalency of the Eu–O bonds is decreased by the Al3+ ions. We concluded that this weak covalency causes the offset of the excited 4f 6 5d level to be small, resulting in an increase in the probability of the radiative relaxation from the 4f 6 5d to 4f 7(8S7/2) level. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116995
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  • 7
    Electronic Resource
    Electronic Resource
    Superconducting glass-ceramic rods in BiCaSrCu2Ox prepared by crystallization under a temperature gradient (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1341-1342 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting BiCaSrCu2Ox glass rods and coils were successfully prepared by pumping up the melt at 1150 °C into SiO2 or Pyrex glass tubes. After the outer glass tubes were removed, the resultant glass rods up to 30 cm long were crystallized under a temperature gradient of 30 °C/mm without deforming and cracking. The Tc (onset) and Tc (zero) of the resulting glass-ceramic rods were ∼80 and 62 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100428
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of composition on the rates of photodarkening and silver photodoping in amorphous P-Se films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1595-1596 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Rates of photodarkening and photodoping of silver were examined in binary PxSe1−x amorphous films over a wide range from x=1 to 0.4. No monotonic change with x was observed for either of the rates. The photodarkening rate remained almost constant in the ranges of x〈0.85, was reduced drastically by two orders of magnitude around x≈0.9, and became constant again in 0.95〈x. A similar composition dependence was observed also for the photodoping rate. These results suggest that the presence of the critical composition in both rates is due to the change in the nature of uppermost orbitals of the valence band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104091
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic measurements of superconducting glass-ceramic fine rods in Bi1Ca1Sr1Cu2Al0.5Ox prepared under a temperature gradient (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1578-1580 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown that the crystallization of the glass precursor under a temperature gradient is very effective for preparing the superconducting glass ceramics in the Bi-Ca-Sr-Cu-O system. The magnetization measurements show that the specimen prepared under a temperature gradient has a magnetization hysteresis several times larger at 4.2 K than that prepared under no temperature gradient; the coupling between superconducting grains of the former is stronger than that of the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102310
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  • 10
    Electronic Resource
    Electronic Resource
    Sol-gel method for synthesizing visible photoluminescent nanosized Ge-crystal-doped silica glasses (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 2545-2547 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ge-nanocrystal-embedded SiO2 glasses were prepared by a sol-gel process. The glasses synthesized through hydrolysis of Si(OC2H5)4 and GeCl4 were heated in the presence of hydrogen at 400–700 °C, in which Ge4+ ions were reduced to precipitate nanosized Ge crystals. Glasses doped with Ge nanocrystals of diameter of ∼5 nm showed a strong room-temperature photoluminescence with peaks at 2.32, 2.17, and 2.0 eV. Large Ge crystals precipitated by heating at 800 °C showed no photoluminescence. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112630
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