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题名: Size-dependent melting: Numerical calculations of the phonon spectrum
作者: Kang, Kai ;  Qin, Shaojing ;  Wang, Chuilin
刊名: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
出版日期: 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
学科分类: Physics
通讯作者: Kang, K , Peking Univ, Sch Phys, Beijing 100871, Peoples R China
部门归属: [Kang, K] Peking Univ, Sch Phys, Beijing 100871, Peoples R China; [Qin, SJ] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; [Wang, CL] China Ctr Adv Sci & Technol, Beijing 100080, Peoples R China
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.
资助者: National Natural Science Foundation of China; MOST of China; Chinese Academy of Sciences
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000264967100013
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5370
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Kang, Kai,Qin, Shaojing,Wang, Chuilin. Size-dependent melting: Numerical calculations of the phonon spectrum[J]. PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES,2009,41(5):817-821.
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