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Diffusion and solubility of holmium ions in barium titanate ceramics

Published online by Cambridge University Press:  01 December 2004

Junichi Itoh ,
Hajime Haneda ,
Shunichi Hishita ,
Isao Sakaguchi ,
Naoki Ohashi ,
Dae-Chul Park  and
Isamu Yashima
Junichi Itoh
Affiliation:
Mitsui Mining & Smelting Co. Ltd., Corp. R&D Center, Saitama 362-0021, Japan; National Institute for Materials Science/Advanced Materials Laboratory, Tsukuba, Ibaraki 305-0044, Japan; and Interdisciplinary Graduate School of Engineering Sciences, Kyushu University,Fukuoka 816-8580, Japan
Hajime Haneda*
Affiliation:
National Institute for Materials Science/Advanced Materials Laboratory, Tsukuba, Ibaraki 305-0044, Japan; and Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8560, Japan
Shunichi Hishita
Affiliation:
National Institute for Materials Science/Advanced Materials Laboratory, Tsukuba, Ibaraki 305-0044, Japan
Isao Sakaguchi
Affiliation:
National Institute for Materials Science/Advanced Materials Laboratory, Tsukuba, Ibaraki 305-0044, Japan
Naoki Ohashi
Affiliation:
National Institute for Materials Science/Advanced Materials Laboratory, Tsukuba, Ibaraki 305-0044, Japan
Dae-Chul Park
Affiliation:
National Institute for Materials Science/Advanced Materials Laboratory, Tsukuba, Ibaraki 305-0044, Japan
Isamu Yashima
Affiliation:
Mitsui Mining & Smelting Co. Ltd., Corp. R&D Center, Saitama 362-0021, Japan
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Ho ion solubility and diffusivity were evaluated in barium titanate ceramics in which Ho ions were implanted with an accelerating voltage of 500 keV. The depth profile of the ions was composed of three regions in the post-annealed sample: the first was the precipitation region, the second was a region created by lattice diffusion of Ho ions, and the third was a region created by grain-boundary diffusion. The Ho lattice diffusion characteristics were similar to those of Ni ion diffusion in barium titanate ceramics, and we concluded that the diffusion mechanism was the same as that responsible for Ni ions. The Ho ions diffused through the B-site (Ti-site) and were then exchanged with A-site ions. This mechanism suggests that a small number of Ho ions dissolved in the B-site. Preferential grain-boundary diffusion was also observed. The grain-boundary diffusion coefficients were four to five orders of magnitude larger than the volume diffusion coefficients. The solubility of Ho ions was estimated to be a few thousand parts per million in barium titanate ceramics.

Keywords

CeramicDiffusionSecondary ion mass spectroscopy (SIMS)
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 12 , December 2004 , pp. 3512 - 3520
Copyright
Copyright © Materials Research Society 2004

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