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Detailed Program
Paper Number : GL-O02
Time Frame : 11:22~11:34
Presentation Date : Thurse day, 27, November
Session Name : Glass & Optp-Electonic Materials
Session Chair 1# : Yong Gyu Choi
Session Chair 2# : Atsunobu Masuno
Potassium ion migration between non-contacted glass plates using corona discharge treatment in H2 atmosphere
Keiga KAWAGUCHI
Hokkaido University
1. Introduction
Corona discharge treatment is known as a non-contact surface modification method for glasses [1-2]. We previously reported that the uniform alkali ion migration occurs between the stacked glasses containing different alkali ions during the corona discharge treatment in air and H2 atmosphere [3]. This report describes the spatial migration of alkali ions between two glass plates with 1 mm gap during the corona discharge treatment.
2. Experimental procedure
Two types of borosilicate glass plates with compositions (mol%) of 20K2O-10B2O3-70SiO2 (KBSi) and 20Na2O-10B2O3-70SiO2 (NaBSi) of 1 mm thickness were used for the corona discharge treatment. Fig. 1 shows the experimental setup for the corona discharge treatment. The KBSi was placed on the NaBSi via an Al2O3 spacer with 1 mm thickness. The corona discharge treatment was performed onto KBSi by the application of a DC voltage of 4.5 kV to the anode needle for 12 h at 200¡ÆC in an atmosphere of ambient air or 100% H2. The current was monitored using a data logger. After the treatment, the surface compositions of two glass plates were analyzed using an energy dispersive X-ray spectroscopy (EDS).
3. Results and Discussion
The K+ injection to NaBSi accompanied with a current of 14 A was observed only by the corona discharge treatment in H2 atmosphere. Fig. 2 represents the result of cross-sectional EDS profile of NaBSi after the treatment. A uniform K+ injected layer of 2 m thickness was formed in the anode side surface of NaBSi, which suggests that the K+ in the KBSi migrated to NaBSi even if the 1 mm gap exists between two glass plates.
The corona discharge treatment in H2 atmosphere realized the spatial migration of alkali ion in the gap between two glass plates, which should be used for the glass surface modification containing alkali ions in ambient pressure and low temperature without molten salts.

References:

[1] D. Sakai et al., Appl. Phys. Lett. 90, 061102 (2007)
[2] K. Kawaguchi et al., Appl. Surf. Sci. 300, 149-153 (2014)
[3] K. Kawaguchi et al., Proc. of the 30th J-K International Seminar on Ceramics K-01 (2013)
Acknowledgements :