RELATIONSHIP BETWEEN STRUCTURAL-PROPERTIES AND ELASTIC ANOMALIES IN AG/NI SUPERLATTICES

被引：4

作者：

CARLOTTI, G ^{[1
]}

MONTONE, A ^{[1
]}

PETRILLO, C ^{[1
]}

ANTISARI, MV ^{[1
]}

机构：

[1] CRE CASACCIA, ENEA, DIV SCI MAT, I-00100 ROME, ITALY

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1993年 / 5卷 / 27期

关键词：

D O I：

10.1088/0953-8984/5/27/006

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The connection between the microstructure of sputter-deposited Ag/Ni superlattices and their elastic response has been investigated in order to give evidence of the role of interface effects in determining the physical properties of this kind of structure. X-ray and transmission electron microscopy (TEM) experiments have shown that the Ag/Ni interfaces are semicoherent even at very low periods; in addition, there are an appreciable number of structural imperfections, such as stacking faults, twins and atomic disorder at the interfaces. The softening of the shear effective elastic constant c44, observed at low periods by means of Brillouin scattering experiments, can be simulated by assuming the presence of a modified layer at each interface, 2/2 atomic planes thick, characterized by a reduced value of the shear effective elastic constant. A comparison between the set of experimental data relating to Ag/Ni superlattices and existing theoretical models suggests that elastic anomalies can be attributed to the presence of atomic disorder at the interfaces, rather than to coherency strains, surface tension stresses or electronic effects.

引用

页码：4611 / 4622

页数：12

共 34 条

[1] ELASTIC-CONSTANTS OF CU/NB SUPERLATTICES [J].