AG L-EDGE X-RAY-ABSORPTION NEAR-EDGE-STRUCTURE STUDY OF CHARGE REDISTRIBUTION AT THE AG SITE IN AU-AG ALLOYS

被引：38

作者：

BZOWSKI, A ^{[1
]}

SHAM, TK ^{[1
]}

YIU, YM ^{[1
]}

机构：

[1] UNIV WESTERN ONTARIO,DETP MAT ENGN & SURFACE SCI WESTERN,LONDON N6A 5B7,ONTARIO,CANADA

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.49.13776

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ag L-edge x-ray-absorption near-edge-structure spectra have been obtained for a series of Au-Ag alloys: Au0.75Ag0.25, Au0.67Ag0.33, Au0.5Ag0.5, and Au0.25Ag0.75. The results show a significant decrease in the Ag L2,3-edge white-line area relative to pure Ag upon dilution of Ag in Au, indicating an increase in d charge at the Ag site. The value of the transition matrix element R(d)2P = 1.2(1) X 10(-10) cm for Ag has been derived based on the experimental results. A semiquantitative analysis of the results shows that the number of unoccupied d states (4d hole counts) at the Ag site in the alloys decreases by as much as 0.130 in Au0.75Ag0.25. The relevance of this finding to Friedel charge screening and Au-Ag d-d interaction is discussed.

引用

页码：13776 / 13779

页数：4

共 20 条

[11] MATTHEISS LF, 1980, PHYS REV B, V22, P1966
[12] McMaster W.H, 1969, COMPILATION XRAY CRO
[13] MORUZZIE VL, 1979, PHYS REV B, V19, P6094
[14] THE BASIS OF THE ELECTRON THEORY OF METALS, WITH SPECIAL REFERENCE TO THE TRANSITION METALS
MOTT, NF
[J]. PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION A, 1949, 62 (355): : 416 - 422
[15] Pearson W.B., 1964, HDB LATTICE SPACING
[16] OBSERVATIONS ON THE D-BAND WIDTH OF AU-AG AND AU-CU ALLOYS
SHAM, TK
BZOWSKI, A
KUHN, M
TYSON, CC
[J]. SOLID STATE COMMUNICATIONS, 1991, 80 (01) : 29 - 32
[17] L-EDGE X-RAY-ABSORPTION SYSTEMATICS OF THE NOBLE-METALS RH, PD, AND AG AND THE MAIN-GROUP METALS IN AND SN - A STUDY OF THE UNOCCUPIED DENSITY OF STATES IN 4D ELEMENTS
SHAM, TK
[J]. PHYSICAL REVIEW B, 1985, 31 (04): : 1888 - 1902
[18] TEMPLETON IM, 1975, 14TH P INT C LOW TEM, P143
[19] TYSON CC, 1992, PHYS REV B, V45, P8811
[20] CHARGE FLOW AND D COMPENSATION IN GOLD ALLOYS
WATSON, RE
HUDIS, J
PERLMAN, ML
[J]. PHYSICAL REVIEW B, 1971, 4 (12): : 4139 - &

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