ON THE 2-STATE MICROSTRUCTURE OF NANOCRYSTALLINE CHROMIUM

被引：45

作者：

EASTMAN, JA ^{[1
]}

FITZSIMMONS, MR ^{[1
]}

机构：

[1] LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545

来源：

JOURNAL OF APPLIED PHYSICS | 1995年 / 77卷 / 02期

关键词：

D O I：

10.1063/1.359035

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High-angle neutron powder diffraction was used to investigate the grain size dependence of the Debye-Waller parameter (DWP) of nanocrystalline and coarse-grained chromium samples. The DWP measured at 20 K depends linearly on inverse grain size and is consistent with a two-state model in which defects with short-ranged displacement fields are present in differing concentrations in two distinct microstructural regions within individual grains. One possible model microstructure consists of grain boundary and free surface regions with significantly larger concentrations of point defects than in grain interiors. Evidence is also seen for an enhancement of the temperature-dependent component of the DWP of chromium with decreasing grain size, indicating different behavior than seen previously for nanocrystalline palladium. © 1995 American Institute of Physics.

引用

页码：522 / 527

页数：6

共 33 条

[1] RESEARCH OPPORTUNITIES ON CLUSTERS AND CLUSTER-ASSEMBLED MATERIALS - A DEPARTMENT OF ENERGY, COUNCIL ON MATERIALS SCIENCE PANEL REPORT [J].

ANDRES, RP ;

AVERBACK, RS ;

BROWN, WL ;

BRUS, LE ;

GODDARD, WA ;

KALDOR, A ;

LOUIE, SG ;

MOSCOVITS, M ;

PEERCY, PS ;

RILEY, SJ ;

SIEGEL, RW ;

SPAEPEN, F ;

WANG, Y .

JOURNAL OF MATERIALS RESEARCH, 1989, 4 (03) :704-736

[2] SIZE-EFFECT MODIFICATIONS OF DEBYE-WALLER FACTOR IN SMALL GOLD PARTICLES [J].

BUFFAT, PA .

SOLID STATE COMMUNICATIONS, 1977, 23 (08) :547-550

[3] RELATIONSHIP BETWEEN INTERFACIAL STRAIN AND THE ELASTIC RESPONSE OF MULTILAYER METAL-FILMS [J].

CLEMENS, BM ;

EESLEY, GL .

PHYSICAL REVIEW LETTERS, 1988, 61 (20) :2356-2359

[4] THEORY OF DIFFUSE X-RAY-SCATTERING AND ITS APPLICATION TO STUDY OF POINT-DEFECTS AND THEIR CLUSTERS [J].

DEDERICHS, PH .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1973, 3 (02) :471-496

[5] Synthesis of nanophase materials by electron beam evaporation [J].

Eastman, J.A. ;

Thompson, L.J. ;

Marshall, D.J. .

Nanostructured Materials, 1993, 2 (04)

[6] THE THERMAL-PROPERTIES OF NANOCRYSTALLINE PD FROM 16-K TO 300-K [J].

EASTMAN, JA ;

FITZSIMMONS, MR ;

THOMPSON, LJ .

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1992, 66 (05) :667-696

[7] NARROWING OF THE PALLADIUM-HYDROGEN MISCIBILITY GAP IN NANOCRYSTALLINE PALLADIUM [J].

EASTMAN, JA ;

THOMPSON, LJ ;

KESTEL, BJ .

PHYSICAL REVIEW B, 1993, 48 (01) :84-92

[8]

EASTMAN JA, 1993, MATER SCI FORUM, V126, P813

[9] ROLES OF GRAIN-SIZE AND STRAIN ON ANTIFERROMAGNETIC ORDER IN NANOCRYSTALLINE CHROMIUM [J].

FITZSIMMONS, MR ;

EASTMAN, JA ;

VONDREELE, RB ;

THOMPSON, LJ .

PHYSICAL REVIEW B, 1994, 50 (08) :5600-5608

[10] MAGNETIC ORDER IN NANOCRYSTALLINE CR AND SUPPRESSION OF ANTIFERROMAGNETISM IN BCC CR [J].

FITZSIMMONS, MR ;

EASTMAN, JA ;

ROBINSON, RA ;

LAWSON, AC ;

THOMPSON, JD ;

MOVSHOVICH, R ;

SATTI, J .

PHYSICAL REVIEW B, 1993, 48 (11) :8245-8253

← 1 2 3 4 →