TY - JOUR
T1 - Synthesis of nanocrystals in KNb(Ge,Si)O5 glasses and chemical etching of nanocrystallized glass fibers
AU - Enomoto, Itaru
AU - Benino, Yasuhiko
AU - Fujiwara, Takumi
AU - Komatsu, Takayuki
N1 - Funding Information:
This work was supported from the Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sport, and Culture, Japan, and by the 21st Century Center of Excellence (COE) Program in Nagaoka University of Technology. The authors also would like to thank Hosokawa Powder Technology Foundation for the partial financial support to this work.
PY - 2006/6
Y1 - 2006/6
N2 - The nanocrystallization behavior of 25K2O-25Nb2O5-(50-x)GeO2-xSiO2 glasses with x = 0, 25, and 50 (i.e., KNb(Ge,Si)O5 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 μm in 25K2O-25Nb2O5-50GeO2 are fabricated, and fibers with sharpened tips (e.g., the taper length is about 450 μm and the tip angle is about 12°) are obtained using a meniscus chemical etching method, in which etching solutions of 10 wt%-HF/hexane and 10 M-NaOH/hexane are used. Although the tip (aperture size) has not a nanoscaled size, the present study suggests that KNb(Ge,Si)O5 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 ε = 58 (1 kHz, room temperature).
AB - The nanocrystallization behavior of 25K2O-25Nb2O5-(50-x)GeO2-xSiO2 glasses with x = 0, 25, and 50 (i.e., KNb(Ge,Si)O5 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 μm in 25K2O-25Nb2O5-50GeO2 are fabricated, and fibers with sharpened tips (e.g., the taper length is about 450 μm and the tip angle is about 12°) are obtained using a meniscus chemical etching method, in which etching solutions of 10 wt%-HF/hexane and 10 M-NaOH/hexane are used. Although the tip (aperture size) has not a nanoscaled size, the present study suggests that KNb(Ge,Si)O5 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 ε = 58 (1 kHz, room temperature).
KW - Chemical etching
KW - Fiber probes
KW - Glass fiber
KW - Nanocrystallization
KW - Raman scattering spectra
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U2 - 10.1016/j.jssc.2006.03.028
DO - 10.1016/j.jssc.2006.03.028
M3 - Article
AN - SCOPUS:33646881493
VL - 179
SP - 1821
EP - 1829
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 6
ER -