Positron annihilation at grain boundaries in metals

被引：6

作者：

Kuriplach, J. ^{[1
]}

Melikhova, O. ^{[1
]}

Hou, M. ^{[1
]}

Van Petegem, S. ^{[1
]}

Zhurkin, E. ^{[1
]}

Sob, M. ^{[1
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Dept Low Temp Phys, V Holesovickach 2, CR-18000 Prague, Czech Republic

来源：

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 4, NO 10 | 2007年 / 4卷 / 10期

关键词：

D O I：

10.1002/pssc.200675813

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Positron annihilation at selected tilt and twist grain boundaries in iron and nickel is examined theoretically. First the atomic structure of studied perfect and imperfect grain boundaries is obtained using molecular dynamics simulations. Characteristics of positrons trapped at such GBs are then calculated employing the atomic superposition method and are related to free volumes found at GBs. It is observed that in some cases vacancies introduced into ideal grain boundaries do not result in an increase of the positron lifetime. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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页码：3461 / +

页数：2

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