THERMODYNAMICS OF NANOCRYSTALLINE PLATINUM

被引：63

作者：

TSCHOPE, A

BIRRINGER, R

机构：

[1] Werstoffwissenschaften, FB.15, Bau 43, Universität des Saarlandes

来源：

ACTA METALLURGICA ET MATERIALIA | 1993年 / 41卷 / 09期

关键词：

D O I：

10.1016/0956-7151(93)90147-K

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline materials are not in thermodynamical stable equilibrium. Excess Gibbs free energy is the thermodynamic driving force for recovery towards stable equilibrium. Recovery of nanocrystalline platinum is discussed in terms of the pathway of excess Gibbs free energy during annealing. Calorimetric measurements yield the excess enthalpy and specific heat. The excess entropy is calculated and found to be linearly dependent upon grain boundary free volume, as is the excess enthalpy, thus scaling with the literature values for general large-angle grain boundaries in platinum. From these results it is possible to calculate how excess Gibbs free energy evolves as recovery proceeds with increasing temperature.

引用

页码：2791 / 2796

页数：6

共 15 条

[1] NANOCRYSTALLINE MATERIALS AN APPROACH TO A NOVEL SOLID STRUCTURE WITH GAS-LIKE DISORDER [J].

BIRRINGER, R ;

GLEITER, H ;

KLEIN, HP ;

MARQUARDT, P .

PHYSICS LETTERS A, 1984, 102 (08) :365-369

[2] NANOCRYSTALLINE MATERIALS [J].

BIRRINGER, R .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 117 :33-43

[3] CALORIMETRIC EVIDENCE FOR THE MICROQUASICRYSTALLINE STRUCTURE OF AMORPHOUS AL-TRANSITION METAL-ALLOYS [J].

CHEN, LC ;

SPAEPEN, F .

NATURE, 1988, 336 (6197) :366-368

[4] NANOCRYSTALLINE MATERIALS [J].

BIRRINGER, R .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1989, 117 :33-43

[5] STRUCTURAL AND THERMODYNAMIC PROPERTIES OF HEAVILY MECHANICALLY DEFORMED RU AND AIRU [J].

HELLSTERN, E ;

FECHT, HJ ;

FU, Z ;

JOHNSON, WL .

JOURNAL OF APPLIED PHYSICS, 1989, 65 (01) :305-310

[6]

HULTGREN R, 1973, SELECTED VALUES THER, P396

[7]

KOCHENDORFER A, 1944, Z METALLKD, V105, P193

[8]

MURR LE, 1975, INTERFACIAL PHENOMEN, P132

[9] THERMODYNAMIC AND STRUCTURAL-PROPERTIES OF [001] TWIST BOUNDARIES IN GOLD [J].

NAJAFABADI, R ;

SROLOVITZ, DJ ;

LESAR, R .

JOURNAL OF MATERIALS RESEARCH, 1991, 6 (05) :999-1011

[10] ENHANCED SPECIFIC-HEAT-CAPACITY (CP) MEASUREMENTS (150-300 K) OF NANOMETER-SIZED CRYSTALLINE MATERIALS [J].

RUPP, J ;

BIRRINGER, R .

PHYSICAL REVIEW B, 1987, 36 (15) :7888-7890

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