Size-dependent melting: Numerical calculations of the phonon spectrum

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	Size-dependent melting: Numerical calculations of the phonon spectrum
	Wang, Chuilin; Kang, Kai; Qin, Shaojing; Kang, K , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
刊名	PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
	2009
卷号	41 期号:5 页码:817-821
关键词	Small Particles Metallic Nanoparticles Nanocrystalline Ni3fe Cohesive Energy Heat-capacities Temperature Thermodynamics Nanoclusters Point
ISSN号	1386-9477
英文摘要	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.
学科主题	Physics
URL标识	查看原文
WOS记录号	WOS:000264967100013
公开日期	2012-08-02
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/5370]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Kang, K , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wang, Chuilin,Kang, Kai,Qin, Shaojing,et al. Size-dependent melting: Numerical calculations of the phonon spectrum[J]. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES,2009,41(5):817-821.
APA	Wang, Chuilin,Kang, Kai,Qin, Shaojing,&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	Wang, Chuilin,et al."Size-dependent melting: Numerical calculations of the phonon spectrum".PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES 41.5(2009):817-821.