检索结果-南通市图书馆

First-principles investigation of the significant anisotropy and ultrahigh thermoelectric efficiency of a novel two-dimensional Ga_(2)I_(2)S_(2) at room temperature

引用

International Journal of Extreme Manufacturing 2022年第2期4卷 100-112页

作者： Zheng Chang Ke Liu Zhehao Sun Kunpeng Yuan Shuwen Cheng Yufei Gao Xiaoliang Zhang Chen Shen Hongbin Zhang Ning Wang Dawei Tang Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian 116024People’s Republic of China Research Office of Propulsion Technology Expace Technology Corporation LimitedBeijing 100176People’s Republic of China Research School of Chemistry Australian National UniversityCanberraACT 2601Australia School of Metallurgy Northeastern UniversityShenyang 100819People’s Republic of China Institut fur Materialwissenschaft Technische Universitat DarmstadtDarmstadt 64283Germany School of Physics University of Electronic Science and Technology of ChinaChengdu 610054People’s Republic of China

Two-dimensional(2D)thermoelectric(TE)materials have been widely developed;however,some 2D materials exhibit isotropic phonon,electron transport properties,and poor TE performance,which limit their application ***,exploring excellent anisotropic and ultrahigh-performance TE materials are very ***,we first investigate the phonon thermal and TE properties of a novel 2D-connectivity ternary compound named *** paper comprehensively studies the phonon dispersion,phonon anharmonicity,lattice thermal conductivity,electronic structure,carrier mobility,Seebeck coefficient,electrical conductivity,and the dimensionless figure of merit(ZT)versus carrier concentration for 2D Ga_(2)I_(2)S_(2).We conclude that the in-plane lattice thermal conductivities of Ga_(2)I_(2)S_(2) at room temperature(300 K)are found to be 1.55 W mK^(−1) in the X-axis direction(xx-direction)and 3.82 W mK^(−1)in the Y-axis direction(yy-direction),which means its anisotropy ratio reaches ***,the TE performance of p-type and n-type doping 2D Ga2I2S2 also shows significant anisotropy,giving rise to the ZT peak values of p-type doping in xx-and yy-directions being 0.81 and 1.99,respectively,and those of n-type doping reach ultrahigh values of 7.12 and 2.89 at 300 K,which are obviously higher than the reported values for p-type and n-type doping ternary compound Sn2BiX(ZT∼1.70 and∼2.45 at 300 K)(2020 Nano Energy 67104283).This work demonstrates that 2D Ga_(2)I_(2)S_(2) has high anisotropic TE conversion efficiency and can also be used as a new potential room-temperature TE material.

关键词： thermoelectricity strong anisotropy two-dimensional materials room temperature first-principles calculation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Highly anisotropic thermal conductivity of few-layer CrOCl for efficient heat dissipation in graphene device

引用

Nano Research 2022年第10期15卷 9377-9385页

作者： Xiaoming Zheng Yuehua Wei Zhenhua Wei Wei Luo Xiao Guo Xiangzhe Zhang Jinxin Liu Yangbo Chen Gang Peng Weiwei Cai Shiqiao Qin Han Huang Chuyun Deng Xueao Zhang College of Physical Science and Technology Xiamen UniversityXiamen 361005China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China College of Arts and Sciences National University of Defense TechnologyChangsha 410073China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Jiujiang Research Institute of Xiamen University Jiujiang 332105China

With the packing density growing continuously in integrated electronic devices,sufficient heat dissipation becomes a serious ***,dielectric materials with high thermal conductivity have brought insight into effective dissipation of waste heat in electronic devices to prevent them from overheating and guarantee the performance *** CrOCl,an antiferromagnetic insulator with low-symmetry crystal structure and atomic level flatness,might be a promising solution to the thermal ***,we have systematically studied the thermal transport of suspended few-layer CrOCl flakes by microRaman *** CrOCl flakes exhibit high thermal conductivities along zigzag direction,from~392±33 to~1,017±46 W·m^(−1)·K^(−1) with flake thickness from 2 to 50 ***,pronounced thickness-dependent thermal conductivity ratio(/from~2.8±0.24 to~4.3±0.25)has been observed in the CrOCl flakes,attributed to the discrepancy of phonon dispersion and phonon surface *** a demonstration to the heat sink application of layered CrOCl,we then investigate the energy dissipation in graphene devices on CrOCl,SiO_(2) and hexagonal boron nitride(h-BN)substrates,*** graphene device temperature rise on CrOCl is only 15.4%of that on SiO_(2) and 30%on h-BN upon the same electric power density,indicating the efficient heat dissipation of graphene device on *** study provides new insights into two-dimentional(2D)dielectric material with high thermal conductivity and strong anisotropy for the application of thermal management in electronic devices.

关键词： CrOCl High thermal conductivity strong anisotropy efficient heat dissipation heat sink graphene devices

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Reflection and transmission coefficient approximation at weak-contrast interfaces for strong VTI media

引用

Science China Earth Sciences 2024年第12期67卷 3914-3938页

作者： Xingyao YIN Yaming YANG Kai LIANG Kun LI National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China School of Geosciences China University of Petroleum(East China)Qingdao 266580China Laoshan Laboratory Qingdao 266580China

Reflection and transmission(R/T)responses characterize the propagation and energy distribution of incident and reflected waves on both sides of an interface which is crucial for imaging,amplitude variation with offset(AVO),and seismic inversion *** media are typically characterized by anisotropy which can have a significant impact on the R/T response,even at small incident ***,anisotropic media problems including reflection,transmission,and inversion are generally discussed under a weak anisotropy ***,this assumption is no longer valid in cases of large angles where anisotropy enhancement exacerbates the error of the conventional R/T coefficient *** R/T coefficient approximation method for strong VTI media was proposed based on the assumption of weak-contrast of the *** contrast to the conventional approach,which simplifies the phase velocity and polarization in an anisotropic background,the phase velocity and polarization at the weak-contrast interface of the elasticity and anisotropy parameters were approximated using a combination of the anisotropic background and perturbation ***,a first-order approximation of the R/T coefficients for the VTI media characterized by elastic and anisotropic parameters was derived using Cramer's law to invert the anisotropic background matrix,avoiding the assumption of weak ***,the exact solution of the Zoeppritz equations was used to correct the isotropic part,improving the accuracy of the R/T coefficients at interfaces with high-velocity *** tests on four classes of typical interfaces showed that the derived equations can be degraded to the Aki approximation in isotropic media,while exhibiting high accuracy in strong VTI *** analyses showed that a linear approximation that facilitates seismic inversion can be obtained by taking the S-to P-velocity ratio and anisotropy parameters in the coefficient terms a

关键词： Reflection and transmission coefficients strong anisotropy VTI media Weak-contrast Phase-velocity Polarization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Simulation of faceted dendrite growth of non-isothermal alloy in forced flow by phase field method

引用

Journal of Central South University 2011年第6期18卷 1780-1788页

作者：陈志郝丽梅陈长乐 Department of Applied Physics School of Science Northwestern Polytechnical University Department of Applied Physics School of Science Xi'an University of Science & Technology

Numerical simulation based on a new regularized phase field model was presented to simulate the dendritic shape of a non-isothermal alloy with strong anisotropy in a forced flow. The simulation results show that a crystal nucleus grows into a symmetric dendrite in a free flow and into an asymmetry dendrite in a forced flow. As the forced flow velocity is increased, both of the promoting effect on the upstream arm and the inhibiting effects on the downstream and perpendicular arms are intensified, and the perpendicular arm tilts to the upstream direction. With increasing the anisotropy value to 0.14, all of the dendrite arms tip velocities are gradually stabilized and finally reach their relative saturation values. In addition, the effects of an undercooling parameter and a forced compound flow on the faceted dendrite growth were also investigated.

关键词： phase field method forced flow strong anisotropy faceted dendrite steady state tip velocity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Phase field method simulation of faceted dendrite growth with arbitrary symmetries

引用

Transactions of Nonferrous Metals Society of China 2018年第2期28卷 290-297页

作者：陈志陈佩巩贺贺段培培郝丽梅金克新西北工业大学理学院应用物理系西安710129 西北工业大学软件与微电子学院西安710129 西安科技大学理学院应用物理系西安710054

A numerical simulation based on a regularized phase field model is developed to describe faceted dendrite growth morphology. The effects of mesh grid, anisotropy, supersaturation and fold symmetry on dendrite growth morphology were investigated, respectively. These results indicate that the nucleus grows into a hexagonal symmetry faceted dendrite. When the mesh grid is above 640×640, the size has no much effect on the shape. With the increase in the anisotropy value, the tip velocities of faceted dendrite increase and reach a balance value, and then decrease gradually. With the increase in the supersaturation value, crystal evolves from circle to the developed faceted dendrite morphology. Based on the Wulff theory and faceted symmetry morphology diagram, the proposed model was proved to be effective, and it can be generalized to arbitrary crystal symmetries.

关键词： phase field method strong anisotropy faceted dendrite Wulff theory tip velocity symmetry

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：