SURFACE SEGREGATION IN A NI-1 AT-PERCENT PD ALLOY

被引：36

作者：

MERVYN, DA

BAIRD, RJ

WYNBLATT, P

机构：

[1] COLUMBIA UNIV,HENRY KRUMB SCH MINES,NEW YORK,NY 10027

[2] FORD MOTOR CO,RES STAFF,DEARBORN,MI 48121

来源：

SURFACE SCIENCE | 1979年 / 82卷 / 01期

关键词：

D O I：

10.1016/0039-6028(79)90319-4

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：

The surface composition of a Ni-1 at% Pd alloy has been determined by Auger electron spectroscopy after equilibration of the alloy at several temperatures in the range 550 to 800°C. Moderate segregation of Pd to the surface of the alloy has been observed, with concentrations of up to ~∼30 at% being detected at the surface after equilibration at 550°C. The heat of segregation (or adsorption) of Pd has been found to agree reasonably well with the predictions of a previously developed unified model of surface segregation in alloys. The kinetics of Pd segregation to the surface have also been measured between 500 and 700°C. Analysis of the kinetic data yields apparent diffusivities of Pd through the alloy that are suggestive of a dominant grain boundary transport mechanism. © 1979.

引用

页码：79 / 92

页数：14

共 16 条

[1] ASKILL J, 1965, ORNL3759 OAK RIDG NA
[2] Gjostein N. A., 1973, DIFFUSION, P241
[3] GJOSTEIN NA, 1970, PHYSIOCHEMICAL MEA 2, V4
[4] GSCHNEIDNER KA, 1964, SOLID STATE PHYS, V16, P275
[5] Hultgren RR, 1973, SELECTED VALUES THER
[6] KINETICS OF SURFACE SEGREGATION
LEA, C
SEAH, MP
[J]. PHILOSOPHICAL MAGAZINE, 1977, 35 (01): : 213 - 228
[7] Mclean D., 1957, GRAIN BOUNDARIES MET
[8] SURFACE COMPOSITION OF BINARY-SYSTEMS - PREDICTION OF SURFACE PHASE-DIAGRAMS OF SOLID-SOLUTIONS
OVERBURY, SH
BERTRAND, PA
SOMORJAI, GA
[J]. CHEMICAL REVIEWS, 1975, 75 (05) : 547 - 560
[9] Shewmon P, 2016, DIFFUSION SOLIDS, DOI [10.1007/978-3-319-48206-4, DOI 10.1007/978-3-319-48206-4]
[10] DETERMINATION OF SURFACE COMPOSITION OF PALLADIUM-NICKEL ALLOY FILM CATALYSTS USING AUGER-ELECTRON SPECTROSCOPY
STODDART, CTH
MOSS, RL
POPE, D
[J]. SURFACE SCIENCE, 1975, 53 (DEC) : 241 - 256

← 1 2 →