STRUCTURE AND THERMAL-STABILITY OF NANOCRYSTALLINE SILVER STUDIED BY TRANSMISSION ELECTRON-MICROSCOPY AND POSITRON-ANNIHILATION SPECTROSCOPY

被引：27

作者：

KIZUKA, T

NAKAGAMI, Y

OHATA, T

KANAZAWA, I

ICHINOSE, H

MURAKAMI, H

ISHIDA, Y

机构：

[1] UNIV TOKYO,INST IND SCI,MINATO KU,TOKYO 106,JAPAN

[2] TOKYO METROPOLITAN IND TECHNOL CTR,KITA KU,TOKYO 115,JAPAN

[3] TOKYO GAKUGEI UNIV,DEPT PHYS,KOGANEI,TOKYO 184,JAPAN

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1994年 / 69卷 / 03期

关键词：

D O I：

10.1080/01418619408242229

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Positron annihilation spectroscopy was carried out on nanocrystalline silver. Both lifetime and Doppler broadening were measured. High-resolution electron microscopy observations were also performed. Diffuse vacancy clusters, the sizes of which correspond to two to four vacancies, and voids of 1-5 nm diameter, were found to reduce the average atomic density of the grain boundary. Some grains grew to a diameter larger than about 70 nm during annealing the specimen from 50 to 100-degrees-C. A large fraction of the diffuse vacancy clusters and voids in the boundaries remained after annealing at 400-degrees-C. They were stabilized during annealing probably by gaseous atoms.

引用

页码：551 / 563

页数：13

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