IN-SITU MEASUREMENTS OF THE LATTICE-PARAMETER OF SUPPORTED PALLADIUM CLUSTERS

被引：55

作者：

GOYHENEX, C

HENRY, CR

URBAN, J

机构：

[1] UNIV AIX MARSEILLE 2, CTR RECH MECANISMES CROISSANCE CRISTALLINE, CNRS LAB,CAMPUS LUMINY,CASE 913, F-13288 MARSEILLE 09, FRANCE

[2] MAX PLANCK GESELL, FRITZ HABER INST, ELEKTRONENMIKROSKOPIE ABT, W-1000 BERLIN 33, GERMANY

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1994年 / 69卷 / 06期

关键词：

D O I：

10.1080/01418619408242239

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Palladium clusters have been epitaxially grown under ultra-high vacuum (UHV) on MgO(100) surfaces cleaved in situ. The lattice parameter was measured in situ by surface electron energy-loss fine-structure spectroscopy (SEELFS) above the palladium N23 edge. The size distribution of the clusters was obtained from ex-situ transmission electron microscopy. An expansion of the palladium lattice, increasing on decrease in the mean cluster size, has been observed. From the UHV in-situ measurements the lattice dilatation is attributed to pseudomorphism. With the SEELFS technique the Debye-Waller factor was also determined. An increase in the mean square displacement of the atoms was observed when the cluster size decreased; the latter was explained by the increase in the proportion of surface atoms and by the effect of the lattice dilatation.

引用

页码：1073 / 1084

页数：12

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