Shape-dependent local internal stress of α-Cr2O3 nanocrystal fabricated by pulsed laser ablation

被引：16

作者：

Lin, C. H. ^{[1
]}

Chen, S. Y. ^{[2
]}

Ho, N. J. ^{[1
]}

Gan, D. ^{[1
]}

Shen, P. ^{[1
]}

机构：

[1] Natl Sun Yat Sen Univ, Inst Mat Sci & Engn, Dept Mat & Optoelect Sci, Ctr Nanosci & Nanotechnol, Kaohsiung 80424, Taiwan

[2] I Shou Univ, Dept Mech & Automat Engn, Kaohsiung, Taiwan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2009年 / 70卷 / 12期

关键词：

Nanostructure; Laser annealing; Raman spectroscopy; Surface properties; Elastic properties; CARBON NANOTUBES; CHROMIUM-OXIDE; CONDENSATION; MORPHOLOGY; CRYSTALS; ENERGY; DIFFRACTION; PRESSURE; SURFACES; GROWTH;

D O I：

10.1016/j.jpcs.2009.09.015

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The alpha-Cr2O3 single-crystal nanocondensates were fabricated by pulsed laser ablation in air and characterized by analytical electron microscopy regarding shape-dependent local internal stress of the anisotropic crystal. The nanocondensates formed predominantly as rhombohedra with well-developed {01 (1) over bar2} surfaces and occasionally hexagonal plate with thin {11 (2) over bar0} edges and blunt corners. Such nanocondensates showed Raman shift for the CrO6 polyhedra, indicating a local compressive stress up to ca. 4GPa on the average. Careful analysis of the lattice fringes revealed a local compressive stress (0.5% strain) at the thin edge of the hexagonal plates and a local tensile stress (0.3-1.0% strain) near the relaxed {(1) over bar 012}, {10 (1) over bar1}, and (0001) surfaces of truncated rhombohedra. The combined effects of nanosize, capillarity force at sharp edge, and specific surface relaxation account for the retention of a local internal compressive stress built up in an anisotropic crystal during a very rapid heating-cooling process. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：1505 / 1510

页数：6

共 24 条

[1] ON THE ENGINEERING PROPERTIES OF MATERIALS [J].

ASHBY, MF .

ACTA METALLURGICA, 1989, 37 (05) :1273-1293

[2] SOLUTE TRAPPING IN SILICON BY LATERAL MOTION OF (111) LEDGES [J].

AZIZ, MJ ;

WHITE, CW .

PHYSICAL REVIEW LETTERS, 1986, 57 (21) :2675-2678

[3] Carbon onions as nanoscopic pressure cells for diamond formation [J].

Banhart, F ;

Ajayan, PM .

NATURE, 1996, 382 (6590) :433-435

[4] Orientation dependence of the distribution coefficient obtained from a spin-1 Ising model [J].

Beatty, KM ;

Jackson, KA .

JOURNAL OF CRYSTAL GROWTH, 1997, 174 (1-4) :28-34

[5] Laser ablation condensation of α-PbO2-type TiO2 [J].

Chen, Shuei-Yuan ;

Shen, Pouyan .

Physical Review Letters, 2002, 89 (09) :961061-961064

[6] Laser ablation condensation and transformation of baddeleyite-type related TiO2 [J].

Chen, SY ;

Shen, PY .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2004, 43 (4A) :1519-1524

[7] Bending and buckling of carbon nanotubes under large strain [J].

Falvo, MR ;

Clary, GJ ;

Taylor, RM ;

Chi, V ;

Brooks, FP ;

Washburn, S ;

Superfine, R .

NATURE, 1997, 389 (6651) :582-584

[8] ON THE RELATIONS BETWEEN STRUCTURE AND MORPHOLOGY OF CRYSTALS .2. [J].

HARTMAN, P ;

PERDOK, WG .

ACTA CRYSTALLOGRAPHICA, 1955, 8 (09) :521-524

[9]

HARTMAN P, 1955, ACTA CRYSTALLOGR, V8, P525, DOI 10.1107/S0365110X55001680

[10] Computer modeling of atomic scale crystal growth processes [J].

Jackson, KA .

JOURNAL OF CRYSTAL GROWTH, 1999, 198 :1-9

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