PHONON SOFT MODES AND DAMAGE PRODUCTION BY HIGH ELECTRONIC EXCITATIONS IN PURE METALS

被引：63

作者：

DUNLOP, A ^{[1
]}

LEGRAND, P ^{[1
]}

LESUEUR, D ^{[1
]}

LORENZELLI, N ^{[1
]}

MORILLO, J ^{[1
]}

BARBU, A ^{[1
]}

BOUFFARD, S ^{[1
]}

机构：

[1] CTR INTERDISCIPLINAIRE RECH IONS LOURDS, F-14040 CAEN, FRANCE

来源：

EUROPHYSICS LETTERS | 1991年 / 15卷 / 07期

关键词：

DEFECTS IN CRYSTALS; ETCH PITS; DECORATION; TRANSMISSION ELECTRON-MICROSCOPY AND OTHER DIRECT OBSERVATIONS OF DISLOCATIONS; IONS;

D O I：

10.1209/0295-5075/15/7/012

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

It is now well known that during high-energy heavy-ion irradiation, the very high-energy deposition in electronic excitation induces a spectacular damage creation in some types of metallic targets. A selected number of pure metals has been irradiated by GeV ions in order to test some possible criteria which might be pertinent to explain such effects: electron-phonon interaction, electrical conductivity, existence of various allotropic phases, ... . The present results show that the latter criterion or more precisely that the existence of a displacive transformation associated with a soft mode in the phonon spectrum seems to favour efficient energy transfers between highly excited electrons and target atoms. For titanium targets, electron microscopy observations show striations which are parallel to the incident ion beam direction.

引用

页码：765 / 770

页数：6

共 23 条

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