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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.53  No.3 (2012)  >  pp.575-577

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Diffusion of Tl Ions into Glass Treated by Molten Salt Ion Exchange and Hydrogen Reduction

Mikito Ueda1), Hajime Matsunaga1), Toshiaki Ohtsuka1) and Toshiharu Yamashita2)
1) Research Faculty of Engineering, Hokkaido University
2) Kawazoe Frontier Technology

To investigate the diffusion behavior of Tl ions, glass was immersed in TlNO3–KNO3 molten salt at 753 K for various lengths of time. The Tl ions embedded in the glass were then reduced to metallic Tl nano-particles by hydrogen at 803 K for 1 h. The depth of the ion exchange layer down to about 140 µm in the glass was found to be proportional to a square root of the length of immersion time. It was suggested that the ion exchange process is controlled by the diffusion of Tl ions from the surface to the inside. Reduction of Tl ions to metallic Tl with the hydrogen gas occurred only at the surface down to 4 µm. The concentration profile of the metallic Tl is discussed by nucleation-nucleus growth and the diffusion of Tl ions from deeper areas.

ion exchange, molten salt, glass, nano-particles

Received: November 07, 2011
Accepted: December 09, 2011 , Published online: February 25, 2012
Copyright (c) 2012 The Japan Institute of Metals



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