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河台金矿床金赋存状态研究 被引量:4
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作者 姚德贤 孙晓明 杨荣勇 《南方钢铁》 1996年第2期18-21,共4页
河台大型金矿床金的赋存状态呈独立矿物和分散状态两种,前者以自然金为主,有包裹金、晶隙金和裂隙金,后者则存在于硫化物晶格中。首次发现含金碲铋矿。
关键词 金矿床 金矿物 赋存状态 自然金 硫化物晶格
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Lattice Mismatch Induced Tunable Dimensionality of Transition Metal Dichalcogenides
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作者 Hanxiao Dong Huijun Jiang Zhonghuai Hou 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2022年第6期853-859,I0001-I0004,I0072,共12页
Low-dimensional materials have excellent properties which are closely related to their dimensionality.However,the growth mechanism underlying tunable dimensionality from 2D triangles to 1D ribbons of such materials is... Low-dimensional materials have excellent properties which are closely related to their dimensionality.However,the growth mechanism underlying tunable dimensionality from 2D triangles to 1D ribbons of such materials is still unrevealed.Here,we establish a general kinetic Monte Carlo model for transition metal dichalcogenides(TMDs) growth to address such an issue.Our model is able to reproduce several key findings in experiments,and reveals that the dimensionality is determined by the lattice mismatch and the interaction strength between TMDs and the substrate.We predict that the dimensionality can be well tuned by the interaction strength and the geometry of the substrate.Our work deepens the understanding of tunable dimensionality of low-dimensional materials and may inspire new concepts for the design of such materials with expected dimensionality. 展开更多
关键词 Transition metal dichalcogenide Dimensionality Low-dimensional material Lattice mismatch Kinetic Monte Carlo simulation
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Low carrier concentration leads to high in-plane thermoelectric performance in n-type SnS crystals 被引量:2
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作者 Wenke He Tao Hong +2 位作者 Dongyang Wang Xiang Gao Li-Dong Zhao 《Science China Materials》 SCIE EI CAS CSCD 2021年第12期3051-3058,共8页
As a simple binary compound, p-type SnS shows great competitiveness in thermoelectrics due to the certain appealing carrier and phonon transport behaviors, coupled with its cost-effectiveness, earth-abundance and envi... As a simple binary compound, p-type SnS shows great competitiveness in thermoelectrics due to the certain appealing carrier and phonon transport behaviors, coupled with its cost-effectiveness, earth-abundance and environmental compatibility. To promote the application of low-cost thermoelectric devices, we synthesized n-type SnS crystals through bromine doping. Herein, we report a high in-plane power factor of ~28 μW cm^(-1)K^(-2), and attribute it to an outstanding in-plane carrier mobility in the crystal form and the large Seebeck coefficient benefitting from the low carrier concentration. The calculations of elastic properties show that the low lattice thermal conductivity in SnS is closely related to its strong anharmonicity. Combining the excellent electrical transport properties with low thermal conductivity, a final ZT of ~0.4 is attained at 300 K, projecting a conversion efficiency of ~5% at 873 K along the in-plane direction. 展开更多
关键词 tin sulfide N-TYPE layered structure carrier concentration thermoelectric transports
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Lattice Dynamics Study of Magnesium Chalcogenides
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作者 张旭东 李志杰 史桂梅 《Communications in Theoretical Physics》 SCIE CAS CSCD 2012年第2期295-300,共6页
First-principles calculations,which are based on the plane-wave pseudopotential approach to density functional perturbation theory within the local density approximation,have been performed to investigate the structur... First-principles calculations,which are based on the plane-wave pseudopotential approach to density functional perturbation theory within the local density approximation,have been performed to investigate the structural,lattice dynamical and thermodynamic properties of zinc blende(B3) structure magnesium chalcogenides:MgS,MgSe and MgTe.The results of ground state parameters and phonon dispersion are compared and agree well with the experimental data available and other calculations.We obtain the change of Born effective charge and LO-TO splitting under hydrostatic pressure.Finally,by the calculations of phonon frequencies,some thermodynamic properties such as the entropy,heat capacity,internal energy,and free energy are also successfully obtained. 展开更多
关键词 FIRST-PRINCIPLES magnesium chalcogenides lattice dynamics thermodynamic properties
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