Amorphization behaviors in polycrystalline alumina irradiated with energetic iodine ions

被引：31

作者：

Aruga, T ^{[1
]}

Katano, Y ^{[1
]}

Ohmichi, T ^{[1
]}

Okayasu, S ^{[1
]}

Kazumata, Y ^{[1
]}

机构：

[1] Japan Atom Energy Res Inst, Tokai Res Estab, Dept Mat Sci, Tokai, Ibaraki 3191195, Japan

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2000年 / 166卷

关键词：

amorphization; polycrystalline alumina; ion irradiation; electronic stopping; fluidization;

D O I：

10.1016/S0168-583X(99)00800-9

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A cross-sectional transmission electron microscopy (XTEM) technique utilized in examining the sintered alumina (Al2O3) sample irradiated by 85.0 MeV iodine ions I7+ to 2.8 x 10(18) m(-2) reveals that almost complete amorphization lakes place up to depths around 2 mu m. Several grains including grains about to be fading out at depths of 2.5-3.5 mu m are seen to have moved from the yet-amorphized region leaving the amorphized region behind. The amorphized regions extend up to depths around 4.5 mu m for the sample irradiated to 12 x 10(18) m(-2). Any defect clusters cannot be observed in grains located at depths around 8 mu m, where nuclear energy depositions are predicted to peak to about 1 dpa. The present results clearly demonstrate that the energy depositions through electronic process in alumina irradiated with heavy ions like present I7+ transform the crystalline phase into amorphous ones even near room temperatures, for accumulated electronic energy depositions above some 1.5-2 GGy with deposition rates above 4-5 keV/nm/ion. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：913 / 919

页数：7

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