Synthesis of nanocrystals in KNb(Ge,Si)O{sub 5} glasses and chemical etching of nanocrystallized glass fibers

Journal Article · Thu Jun 15 00:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.03.028· OSTI ID:20905317

Enomoto, Itaru ^[1]; Benino, Yasuhiko ^[1]; Fujiwara, Takumi ^[1]; Komatsu, Takayuki ^[1]

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1. Department of Materials Science and Technology, Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188 (Japan)

The nanocrystallization behavior of 25K{sub 2}O-25Nb{sub 2}O{sub 5}-(50-x)GeO{sub 2}-xSiO{sub 2} glasses with x=0,25,and50 (i.e., KNb(Ge,Si)O{sub 5} glasses) and the chemical etching behavior of transparent nanocrystallized glass fibers have been examined. All glasses show nanocrystallization, and the degree of transparency of the glasses studied depends on the heat treatment temperature. Transparent nanocrystallized glasses can be obtained if the glasses are heat treated at the first crystallization peak temperature. Transparent nanocrystallized glass fibers with a diameter of about 100{mu}m in 25K{sub 2}O-25Nb{sub 2}O{sub 5}-50GeO{sub 2} are fabricated, and fibers with sharpened tips (e.g., the taper length is about 450{mu}m and the tip angle is about 12{sup o}) are obtained using a meniscus chemical etching method, in which etching solutions of 10wt%-HF/hexane and 10M-NaOH/hexane are used. Although the tip (aperture size) has not a nanoscaled size, the present study suggests that KNb(Ge,Si)O{sub 5} nanocrystallized glass fibers have a potential for new near-field optical fiber probes with high refractive indices of around n=1.8 and high dielectric constants of around {epsilon}=58 (1kHz, room temperature)

• OSTI ID: 20905317
• Journal Information: Journal of Solid State Chemistry, Vol. 179, Issue 6; Other Information: DOI: 10.1016/j.jssc.2006.03.028; PII: S0022-4596(06)00166-6; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTALLIZATION
ETCHING
FIBERGLASS
GERMANIUM OXIDES
GLASS
HEAT TREATMENTS
HEXANE
HYDROFLUORIC ACID
NANOSTRUCTURES
NIOBIUM OXIDES
OPACITY
OPTICAL FIBERS
PERMITTIVITY
POTASSIUM OXIDES
RAMAN EFFECT
REFRACTIVE INDEX
SILICON OXIDES
SODIUM HYDROXIDES
SOLUTIONS
TEMPERATURE RANGE 0273-0400 K