The Phase Structures and Properties of Pt-Ir-M (M=Zr, Mo, Y) System

2015 ◽  
Vol 1095 ◽  
pp. 214-217
Author(s):  
Ming Xie ◽  
Yong Chen ◽  
Ji Ming Zhang ◽  
Jie Qiong Hu ◽  
You Cai Yang ◽  
...  
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Electronic Structures ◽  
Phase Structure ◽  
Solidification Rate ◽  
First Principle ◽  
Phase Structures ◽  
Structures And Properties ◽  
Energetic Stability ◽  
Calculation Results

A series of new alloys including Pt-Ir-M (M=Zr, Mo, Y) were invented in this study. The physical properties, electrical properties parameters and thermodynamics database of the alloys were established. The phase structure and composition were analyzed. The calculation results were verified by experiments. The influence of solidification rate to microstructures, morphology and grain size of Pt-Ir-M alloys were analyzed. According to First Principle, the electronic structures, bonding characters and energetic stability of the alloys were calculated, the calculate result indicated that Pt-Ir-Mo is formed more easily than Pt-Ir-Zr and Pt-Ir-Y, and the formed Pt-Ir-Mo is more stable than Pt-Ir-Zr and Pt-Ir-Y.

Phase Structures and Properties of Au-Pd-M (M=Zr, Mo, Y) System

2015 ◽  
Vol 816 ◽  
pp. 722-725
Author(s):  
Ming Xie ◽  
You Cai Yang ◽  
Ji Ming Zhang ◽  
Yong Tai Chen ◽  
Sai Bei Wang ◽  
...  
Keyword(s):  
First Principles ◽  
Electronic Structures ◽  
Density Functional ◽  
Solidification Rate ◽  
Potential Method ◽  
Functional Theory ◽  
Structures And Properties ◽  
The Density Functional Theory ◽  
Calculation Results ◽  
Pseudo Potential

A series of new alloys including Au-Pd-M (M=Zr, Mo, Y) were developed in this study. The physical properties, electrical properties parameters and thermodynamics database of the alloys were established. The phase structure and composition were analyzed. The calculation results were verified by experiments. The influence of solidification rate to microstructures, morphology and grain size of Au-Pd-M alloys were analyzed. A first-principles plane-wave pseudo-potential method based on the density functional theory was used to investigate the electronic structures, bonding characters and energetic stability of Au-Pd-M alloys, the calculating results indicated that Au-Pd-Mo formed more easily than Au-Pd-Zr and Au-Pd-Y, and the formed Au-Pd-Mo is more stable than Au-Pd-Zr and Au-Pd-Y.

Phase structures and magnetostriction of Fe71.3Ga28.7 alloys prepared by different solidification rates

2021 ◽  
Author(s):  
Xing Mu ◽  
Yan Qi ◽  
Shaowen Yan ◽  
Yongqing Liu ◽  
Chao Cheng ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Directional Solidification ◽  
Phase Structure ◽  
Crystal Orientation ◽  
Solidification Rate ◽  
Zone Melting ◽  
Multiphase Structure ◽  
Low Field ◽  
Phase Structures

Magnetostrictive property shows anisotropic characteristics, which are related to phase structure and crystal orientation. In this paper, phase structures and magnetostrictive properties of Fe[Formula: see text]Ga[Formula: see text] at different solidification rates during zone-melting directional solidification were studied. Results show that when the solidification rate exceeds 72 mm/h, the sample has a single A2 structure. A multiphase structure of D03 and A2 is formed when the solidification rate is 36 mm/h. The multiphase structure of L12 and A2 emerges in the sample prepared with a solidification rate of 18 mm/h. The samples with L12 and A2 multiphase structure have excellent low-field magnetostrictive properties, reaching 68 × 10[Formula: see text] under a magnetic field of 20 kA/m.

First-Principle Study of the Electronic and Optical Properties of Ti Doped ZnS

2012 ◽  
Vol 430-432 ◽  
pp. 173-176 ◽  
Author(s):  
Chang Peng Chen ◽  
Jian Xiong Xie ◽  
Jia Fu Wang
Keyword(s):  
Optical Properties ◽  
Fermi Level ◽  
Conduction Band ◽  
Electronic Structures ◽  
Density Functional ◽  
Band Gaps ◽  
First Principle ◽  
Level Shifts ◽  
Calculation Results ◽  
Impurity Elements

Based on the density functional pseudopotential method, the electronic structures and the optical properties for Ti doped ZnS are investigated in detail. The calculation results indicate that the doping of Ti widens the band gap of ZnS and the Fermi level shifts upward into the conduction band. The impurity elements form new highly localized impurity energy level at the bottom of the conduction band near the Fermi level.,.Meanwhile, blue shifts are revealed in both the imaginary part of dielectric function and the absorption spectra corresponding to the change of band gaps.

Effects of YMnO3 Addition on Phase Structure, Microstructure and Electrical Properties of (Na0.515K0.485)0.94Li0.06(Nb0.8Ta0.2)O3 Lead-Free Ceramics

2014 ◽  
Vol 979 ◽  
pp. 167-170
Author(s):  
Pornsuda Bomlai
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Phase Structure ◽  
Dissipation Factor ◽  
Lead Free ◽  
Low Dielectric ◽  
Lead Free Ceramics ◽  
Dielectric Dissipation Factor ◽  
Sintering Method ◽  
Piezoelectric Devices

The (1-x)[(Na0.515K0.485)0.94Li0.06(Nb0.8Ta0.2)O3]-xYMnO3 (x = 0, 0.005, 0.01, 0.015 and 0.02) lead-free ceramics were synthesized by solid-state reaction sintering method. It was found that the addition of YMnO3 affected on the grain size, phase structure and electrical properties of (Na0.515K0.485)0.94Li0.06(Nb0.8Ta0.2)O3 ceramics. The grain size decreased with increasing YMnO3 content (x ≥ 0.01) and led to poor densification. The ceramic doped with 0.5 mol% YMnO3 showed good electrical properties such as d33 = 195 pC/N, kp = 43.9 %, Tc = 292 °C, TO−T = 35 °C, εr = 820 and rather low dielectric dissipation factor = 2.1%. This indicates that 0.5 mol% YMnO3 -doped (Na0.515K0.485)0.94Li0.06(Nb0.8Ta0.2)O3 piezoceramic is an alternative lead-free piezoelectric material for the development of piezoelectric devices working at high temperature.

Carbon Black Selective Dispersion and Electrical Properties of Epoxy Resin/Polystyrene/Carbon Black Ternary Composites

2012 ◽  
Vol 548 ◽  
pp. 94-98 ◽  
Author(s):  
Chuan Guo Ma ◽  
Ming Liu
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Carbon Black ◽  
Polymer Blends ◽  
Epoxy Resin ◽  
Phase Structure ◽  
Continuous Phase ◽  
Phase Structures ◽  
Thermosetting Polymer ◽  
Conductive Properties

Carbon black (CB) selective dispersion and conductive properties of immiscible thermoplastic/thermosetting polymer blends consisting of polystyrene (PS) and epoxy resin (EP) were investigated in this paper. The results showed that CB particles are preferentially localized in EP phase in PS/EP blends. The blend with 10 pbw (parts by weight) PS presented an EP continuous phase structure, and both blends with 20 pbw and 30 pbw developed into a bi-continuous phase structure. The selective dispersion of CB particles was explained by thermodynamic parameters. The phase structures of blends have important influences on both conductive and dielectric properties. The blends with 10 pbw PS has a very low percolation threshold nearly 0.25wt%.

scholarly journals Comparative Study on Electronic Structure and Optical Properties of α-Fe2O3, Ag/α-Fe2O3 and S/α-Fe2O3

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 424
Author(s):  
Cuihua Zhao ◽  
Baishi Li ◽  
Xi Zhou ◽  
Jianhua Chen ◽  
Hongqun Tang
Keyword(s):  
Optical Properties ◽  
Optical Absorption ◽  
Electronic Structures ◽  
Density Functional ◽  
Peak Strength ◽  
Visible Range ◽  
High Symmetry ◽  
Functional Theory ◽  
Optical Absorption Peak ◽  
Calculation Results

The electronic structures and optical properties of pure, Ag-doped and S-doped α-Fe2O3 were studied using density functional theory (DFT). The calculation results show that the structure of α-Fe2O3 crystal changes after Ag and S doping, which leads to the different points of the high symmetry of Ag-doped and S-doped α-Fe2O3 with that of pure α-Fe2O3 in the energy band, as well as different Brillouin paths. In addition, the band gap of α-Fe2O3 becomes smaller after Ag and S doping, and the optical absorption peak shifts slightly toward the short wavelength, with the increased peak strength of S/α-Fe2O3 and the decreased peak strength of Ag/α-Fe2O3. However, the optical absorption in the visible range is enhanced after Ag and S doping compared with that of pure α-Fe2O3 when the wavelength is greater than 380 nm, and the optical absorption of S-doped α-Fe2O3 is stronger than that of Ag-doped α-Fe2O3.

Nucleation layer microstructure, grain size, and electrical properties in GaN grown on a-plane sapphire

1999 ◽  
Vol 75 (5) ◽  
pp. 686-688 ◽  
Author(s):  
M. E. Twigg ◽  
R. L. Henry ◽  
A. E. Wickenden ◽  
D. D. Koleske ◽  
J. C. Culbertson
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Nucleation Layer

scholarly journals Structural and Electrical Studies on ZnO-Based Thin Films by Laser Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Shanyue Zhao ◽  
Yinqun Hua ◽  
Ruifang Chen ◽  
Jian Zhang ◽  
Ping Ji
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Electrical Properties ◽  
Grain Boundaries ◽  
Laser Irradiation ◽  
Nonlinear Coefficient ◽  
Acceptor State ◽  
Xrd Pattern ◽  
Electrical Studies ◽  
Structural And Electrical Properties

The effects of laser irradiation on the structural and electrical properties of ZnO-based thin films were investigated. The XRD pattern shows that the thin films were highly textured along thec-axis and perpendicular to the surface of the substrate. Raman spectra reveal that Bi2O3segregates mainly at ZnO-ZnO grain boundaries. After laser irradiation processing, the grain size of the film was reduced significantly, and the intrinsic atomic defects of grain boundaries and Bi element segregated at the grain boundary were interacted frequently and formed the composite defects of acceptor state. The nonlinear coefficient increased to 24.31 and the breakdown voltage reduced to 5.34 V.

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