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Kang, Kai; Qin, Shaojing; Wang, Chuilin; Kang, K , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
Size-dependent melting: Numerical calculations of the phonon spectrum
发表期刊PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
关键词Small Particles Metallic Nanoparticles Nanocrystalline Ni3fe Cohesive Energy Heat-capacities Temperature Thermodynamics Nanoclusters Point
摘要In order to clarify the relationship between the phonon spectra of nanoparticles and their melting temperature, we Studied in detail the size-dependent low energy vibration modes. A minimum model with atoms on a lattice and harmonic potentials for neighboring atoms is used to reveal a general behavior. By calculating the phonon spectra for a series of nanoparticles of two lattice types in different sizes, we found that density of low energy modes increases as the size of nanoparticles decreases, and this density increase causes decrease in melting temperature. And we obtained the linear depression of nanoparticle melting temperature with decreasing size. Size-dependent behavior of the phonon spectra accounts for typical properties of surface-premelting and irregular melting temperature on fine scales. These results show that our microscopic model captures the main physics of nanoparticles. (C) 2009 Elsevier B.V. All rights reserved.
2009
ISSN1386-9477
卷号41期号:5页码:817-821
学科领域Physics
收录类别SCI
项目资助者National Natural Science Foundation of China; MOST of China; Chinese Academy of Sciences ; National Natural Science Foundation of China; MOST of China; Chinese Academy of Sciences ; National Natural Science Foundation of China; MOST of China; Chinese Academy of Sciences ; National Natural Science Foundation of China; MOST of China; Chinese Academy of Sciences
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被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/5370
专题理论物理所科研产出_SCI论文
通讯作者Kang, K , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
推荐引用方式
GB/T 7714
Kang, Kai,Qin, Shaojing,Wang, Chuilin,et al. Size-dependent melting: Numerical calculations of the phonon spectrum[J]. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES,2009,41(5):817-821.
APA Kang, Kai,Qin, Shaojing,Wang, Chuilin,&Kang, K , Peking Univ, Sch Phys, Beijing 100871, Peoples R China.(2009).Size-dependent melting: Numerical calculations of the phonon spectrum.PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES,41(5),817-821.
MLA Kang, Kai,et al."Size-dependent melting: Numerical calculations of the phonon spectrum".PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES 41.5(2009):817-821.
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