Jing Chao Chen

On Effect of Microstructure about Bi for AgSnO2 Compositions by Reaction Synthesis

This paper adopted XRD, SEM and DTA/TGA methods to discuss the microstructure of sinter AgSnO2 compositions with bismuth and without bismuth. The results showed that microstructures AgSnO2 compositions are different whether or not include bismuth. The introduction of Bi does not produce the expected SnO2 and Bi2O3 phase, but generated SnO2 and Sn2Bi2O7 phase. The reason with different microstructure has relation with early melting of Bi-rich alloys having low melting point and silver oxide decomposition rate and sinter temperature. Therefore, bring third element should be cautious for preparation composite metal oxide increase silver matrix electrical contact materials.

Study on Electronic Structure and Optical Property of Silicon Doped with Transition Metal by First Principles

The First-principles based on plane-wave pseudo-potentials methods was applied to investigate the lattice parameter, electronic structure and optical property of pure Si doped with transition metal. The calculation result show that the lattice parameter decrease for Si doped with Cr and therefore the more stable structure, Si doped with Sc, Ti, V have opposite trend. Hybrid and electron transfer display intensely for Si doped with Cr from that with Sc, Ti, V. the absorption peak is located at the region of 2.42eV-2.80eV and the absorption coefficient increase intensely for doped Cr system.

Preparation of ITO Target by Molecular Dynamics Simulation with Normal Pressure Sintering Method

The volume change of ITO target sintering at different temperature of 1673K,1773K,1793K,1823K,1853K and 1873K were investigated by means of molecular dynamics simulation. The experimental results revealed that the rate of reduction in bulk was very fast in prior period of ITO green sintering process, and it was slow in later period. The atomic model of ITO green got the smallest value of 890.918nm3 at the 1853K, and the ITO green can receive the highest densification at this temperature. The simulation results can provide theoretical direction for ITO target normal pressure sintering method.

First-Principles Calculations for Electrical Proterties of the Lead Anode Plate

Four kinds of fermi energy of lead anode plate were calculated by using first-principles. Different metals and different alloy elements of the fermi energy level were compared, the minimum electrode potential lead base alloy anode materials is known. The results calculations show that the adding alloy elements can reduce the electrode potential of the lead anode plate, four kinds of alloy systems Pb-Ag, Pb-Sb, Pb-Sr, Pb-Sn were calculated, the highest of fermi energy was Pb-Sb alloy. So the Pb-Sb alloy is expected to become the electrode potential minimum lead base alloy anode materials.

Solid-State Reaction and Gas Sensor Properties of Porous SnO2-In2O3 Composites

Mixtures of ITO and SnO2 powders were prepared by a solid-state reaction method in order to produce porous composite materials. X-ray diffraction, scanning electron microscope and gas sensing testing system have been used to analyze the microstructure and properties of it .It has been concluded that when the sintering temperature is 1573K,it has better gas-sensing properties. The pore structure and CO gas sensing property of porous SnO2-In2O3 composite materials can be improved with the increase of SnO2 contents.

First Principles Study on Rutile SnO2 Improving Gas Sensor Properties of Porous SnO2-In2O3 Composites

we built the rutile SnO2 to study SnO2 improving gas sensor properties for rutile structure of SnO2 existing in the SnO2-In2O3 composite materials by X-ray analysis. The surface (110) of SnO2 is a stable structure by analysis of surface energy. Compared with oxidized surface (110), reduced surface (110) has better conductivity and stability. As a result, the CO adsorption changes the electric conductivity of the whole reductive (110) surface, and leads to the deviation of Fermi energy. Therefore, it is an important reason affecting gas sensor properties of the SnO2-In2O3 composite materials. By calculating and simulating the density functional first-principal, the research of the adsorption of rutile SnO2 towards CO provides a theoretical foundation for the argument of the gas sensitivity of porous SnO2-In2O3 composite materials towards CO with the increasing of SnO2 contents.

Effective Means of Microstructure Homogenization for AgMeO: Cumulative Extrusion Severe Plastic Deformation

This paper mainly aimed at uniform microstructure generally of particulate reinforced metal matrix composites and put forward the method, which was severe plastic deformation, for microstructure homogenization of particulate reinforced metal matrix composites. Basis on introducing origin of severe plastic deformation and the theory of cumulative extrusion severe plastic deformation, the paper researched the microstructure homogenization of silver metal oxide by cumulative extrusion severe plastic deformation. The result showed that microstructure homogenization of silver metal oxide could be uniformed by cumulative extrusion severe plastic deformation. The results also showed that condition of microstructure homogenization was obtained fine or nanometer second phase particles in fabrication and selected intensity of severe plastic deformation according to system and character of particulate reinforced metal matrix composites.

ME Molecular Dynamics Simulation of the Sintering Process of the Porous ITO Material

Simulated the sintering process of the porous ITO gas-sensitive material with Materials Explorer 5.0. Observed the the process of neck formation and growth, grain growth and pore shrunk. Than, compared the result with experimentation. We found that the simulation results were similar to the microstructure photos. At the same time, we could observe the migration process of atoms in simulation results which we cannot observe in actual experiment. It proves that we get the theory basis of the experiment result estimate and proved the guiding effect of molecular dynamics simulation to the actual experiment.

First-Principles Investigation about the Plastic Property of Doping Ni in Ir Solid Solution System

We mainly give research and application status of iridium and iridium alloy materials in this paper, then prospect development tendency and application of the iridium alloy in the future. This paper based on density functional theory of first-principles plane wave method, choose local density approximation (LDA) potential to calculate the different doped amount of Ni in Ir Solid Solution System, found the impact on plastic property, the calculation results reveal that Ir44Ni4 began to show the plastic performance, With the increaseing of the adding Ni atom later, plastic performance becomes more and more strong.

Fabrication of Porous Structured SnO2/In2O3 Composite by Solid-Phase Reactive Sintering

This paper studied affect of porous structure SnO2/In2O3composites about sinter temperature and chemical content of SnO2 by solid-phase reactive sintering method. It studied on the influence of different content of SnO2 and sintering temperature to porous structure SnO2/ In2O3 composites. The microstructure and phase were analyzed by SEM (Scanning Electron Microcopy) and XRD (X-ray diffraction). The results showed SnO2/In2O3 composites had better porous structure as following conditions: the content was 10% SnO2 in SnO2/In2O3 composites and sintering temperature was 1300°C holding 3 hours after 600°C holding 1 hour, and then cooling to room temperature in the furnace.