2-DIMENSIONAL INTERMETALLIC YB-NI COMPOUNDS

被引：6

作者：

ANDERSEN, JN

BJORNEHOLM, O

CHRISTIANSEN, M

NILSSON, A

WIGREN, C

ONSGAARD, J

STENBORG, A

MARTENSSON, N

机构：

[1] UNIV UPPSALA,INST PHYS,S-75121 UPPSALA,SWEDEN

[2] ODENSE UNIV,INST PHYS,DK-5230 ODENSE,DENMARK

来源：

SURFACE SCIENCE | 1990年 / 232卷 / 1-2期

关键词：

D O I：

10.1016/0039-6028(90)90588-Y

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Two-dimensional (2D) Yb-Ni intermetallic compounds formed by co-depositing Yb and Ni on a Mo(110) surface have been studied with high resolution core level photoemission and LEED. Two 2D intermetallic compound phases, Yb2Ni and YbNi2, were found to develop. The Yb2Ni compound is characterized by a 7 × 2 LEED pattern and an Yb 4f 7 2 binding energy of 1.0 eV, the YbNi2 by a 3 × 2 LEED pattern and a 4f 7 2 binding energy of 0.6 eV. Models for these phases are proposed from the LEED patterns and are shown to be consistent with the Yb core level binding energies. A phase diagram of the Yb-Ni on Mo(110) 2D system is proposed based on separation into Yb2Ni, YbNi2 and pure Yb and Ni layers. This phase diagram is discussed in terms of a competition between the 2D compound heat of formation and the lowering of the Mo(110) surface energy by adsorbed Yb. © 1990.

引用

页码：63 / 72

页数：10

共 9 条

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