scholarly journals The influence of chemical composition on microstructure, hardness and electrical conductivity of Ag-Bi-In alloys at 100 °C

10.30544/265 ◽  
2017 ◽  
Vol 23 (1) ◽  
pp. 65-82
Author(s):  
Vladan Ćosović ◽  
Duško Minić ◽  
Milena Premović ◽  
Dragan Manasijević ◽  
Aleksandar Đorđević ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Isothermal Section ◽  
Energy Dispersive Spectrometry ◽  
Xrd Analysis ◽  
Ternary Alloys ◽  
Mechanical And Electrical Properties ◽  
Calculated Liquidus ◽  
Phase Transition Temperatures ◽  
Corrected Data ◽  
Invariant Equilibria

Considering possible applications and scarceness of literature data, Ag-Bi-In system was investigated in terms of microstructure, mechanical and electrical properties of ternary alloys from an isothermal section at 100oC. Based on the experimentally obtained results hardness and electrical conductivity of all ternary alloys from the ternary Ag-Bi-In system at 100oC were predicted. In addition, the selected isothermal section was further thermodynamically assessed and experimentally studied using scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), X-ray powder diffraction (XRD) analysis and light optical microscopy (LOM). Phase transition temperatures of alloys with overall compositions along vertical sections x(Ag)=0.5 as well as liquidus temperatures were experimentally determined by DTA. The experimentally obtained results were compared with literature data and with the results of thermodynamic calculation of phase equilibria based on CALPHAD method and corrected data for Ag-In binary system. Calculated liquidus projection, invariant equilibria and phase diagram of the Ag-Bi-In ternary system are presented as well.

scholarly journals Mechanical and electrical properties of the Bi-Ge-Sn alloys

10.30544/562 ◽  
2020 ◽  
Vol 26 (4) ◽  
pp. 395-412
Author(s):  
Milena Premovic ◽  
Aleksandar Djordjevic ◽  
Dusko Minic ◽  
Milica Tomovic ◽  
Branko Radicevic ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Electrical Conductivity ◽  
Isothermal Section ◽  
Electrical Properties ◽  
Binary Systems ◽  
Brinell Hardness ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Mechanical And Electrical Properties ◽  
Good Agreement

Mechanical and electrical properties of the ternary Bi-Ge-Sn alloys were investigated in this study. Calculation of isothermal section at 200, 300, and 25 ºC was carried out by using optimized thermodynamic parameters for the constitutive binary systems. Microstructures of alloys were observed by using optical microscopy and scanning electron microscopy (SEM). Phases in microstructures have been detected by X-ray diffraction (XRD) analysis and compositions of the phase by energy dispersive spectrometry (EDS). EDS results were compared with the predicted isothermal section at 200 and 300 ºC, and good agreement has been reached between them. The Brinell hardness and electrical conductivity of selected alloys were measured.  Through ANOVA analysis and application of the obtained results, an appropriate mathematical model is proposed for every composition of alloys. By using the appropriated mathematical model for Brinell hardness and electrical conductivity, isolines for those properties were presented.

scholarly journals Mechanical and electrical properties of ternary Ag-Bi-Ga system at 250 °C

10.30544/309 ◽  
2017 ◽  
Vol 23 (3) ◽  
pp. 227-240
Author(s):  
Duško Minić ◽  
Dragan Manasijević ◽  
Yong Du ◽  
Pavel Brož ◽  
Vladan Ćosović ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Energy Dispersive Spectrometry ◽  
Thermodynamic Assessment ◽  
Vickers Microhardness ◽  
Brinell Hardness ◽  
Hardness Test ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Comparative Review ◽  
The Individual

This paper presents a comparative review of the experimental and thermodynamic assessment of a ternary Ag-Bi-Ga system. An isothermal section at 250 °C was calculated using optimized thermodynamic data for the constitutive binaries. Microstructures and phase compositions of studied alloys were analyzed by scanning electron microscopy in combination with energy dispersive spectrometry and X-ray powder diffraction technique. The obtained experimental results were found to support the predicted phase equilibria rather well. The hardness of alloys from three vertical sections (Bi-AgGa, Ag-BiGa, and Ga-AgBi) was determined using Brinell hardness test while the hardness of the individual identified phases was determined using Vickers microhardness test. Additional electrical conductivity measurements were carried out on the same alloy samples. Based on the experimentally obtained results iso-lines of Brinell hardness and electrical conductivity for the entire compositional range were calculated.

scholarly journals Phase transformation and microstructure study of the as-cast Cu-rich Cu-Al-Mn ternary alloys

2017 ◽  
Vol 53 (3) ◽  
pp. 413-422 ◽  
Author(s):  
T. Holjevac-Grguric ◽  
D. Manasijevic ◽  
S. Kozuh ◽  
I. Ivanic ◽  
Lj. Balanovic ◽  
...  
Keyword(s):  
Xrd Analysis ◽  
Electric Arc ◽  
Ternary Alloys ◽  
Arc Furnace ◽  
Analysis Phase ◽  
Thermal Analyzer ◽  
Phase Transition Temperatures ◽  
Cast Alloys ◽  
Simultaneous Thermal Analyzer ◽  
Scanning Electron

Four Cu-rich alloys from the ternary Cu-Al-Mn system were prepared in the electric-arc furnace and casted in cylindrical moulds with dimensions: f=8 mm and length 12 mm. Microstructural investigations of the prepared samples were performed by using optical microscopy (OM) and scanning electron microscopy, equipped by energy dispersive spectroscopy (SEM-EDS). Assignation of crystalline phases was confirmed by XRD analysis. Phase transition temperatures were determined using simultaneous thermal analyzer STA DSC/TG. Phase equilibria calculation of the ternary Cu-Al-Mn system was performed using optimized thermodynamic parameters from literature. Microstructure and phase transitions of the prepared as-cast alloys were investigated and experimental results were compared with the results of thermodynamic calculations.

scholarly journals Experimental investigation and thermodynamic calculations of the Bi-Ni-Pb phase diagram

2019 ◽  
Vol 55 (2) ◽  
pp. 157-166 ◽  
Author(s):  
D. Minic ◽  
M. Premovic ◽  
N. Toskovic ◽  
D. Manasijevic ◽  
V. Cosovic ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Close Agreement ◽  
Binary Systems ◽  
Energy Dispersive Spectrometry ◽  
Calculated Phase Diagram ◽  
Xrd Analysis ◽  
Ternary Alloys ◽  
Isothermal Sections ◽  
X Ray ◽  
Scanning Electron

The article presents an experimental study of a phase diagram of a ternary Bi-Ni-Pb system using differential thermal analysis (DTA), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), and X-ray powder diffraction (XRD) analysis. The investigated ternary alloys were selected from three vertical sections (x(Bi)=0.75, x(Ni)=0.1 and x(Pb)=0.9) and two isothermal sections at 100 and at 300?C. The obtained experimental results were compared with the thermodynamically extrapolated phase diagram of the Bi-Ni-Pb ternary system based on the thermodynamic parameters for the constitutive binary systems available in literature. Reasonably close agreement between the experimental data and the calculated phase diagram was obtained.

Electrical conductivity and hardness of ternary Ge-In-Sb allyos and calculation of the isothermal section at 300 °C

2015 ◽  
Vol 57 (10) ◽  
pp. 883-888 ◽  
Author(s):  
Milena Premović ◽  
Duško Minić ◽  
Kosovska Mitrovica ◽  
Ivana Manasijević ◽  
Dragana Živković
Keyword(s):  
Electrical Conductivity ◽  
Isothermal Section

A copper-(lignin/silica/fatty acids) complex as an antioxidant/electrical conductivity agent for rubber composites (Part iii)

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hoda Sabry Othman ◽  
Maher A. El-Hashash ◽  
S. H. El-Sabbagh ◽  
A. A. Ward ◽  
Galal A.M. Nawwar
Keyword(s):  
Electrical Conductivity ◽  
Antioxidant Activity ◽  
Design Methodology ◽  
Black Liquor ◽  
Coupling Agents ◽  
Rheological Characteristics ◽  
Rubber Composites ◽  
Content Type ◽  
Mechanical And Electrical Properties ◽  
Antioxidant Additives

Purpose Calcium and Zinc lignates were proven to be good antioxidants for rubber composites. The purpose of this paper is to evaluate the copper lignate antioxidant activity along with evaluating its electrical conductivity in rubber composites. Design/methodology/approach The antioxidant activity of the Cu-LSF complex was compared with that of standard commercial antioxidant additives as a green alternative. The rheological characteristics, thermal aging and mechanical and electrical properties were evaluated for the NBR vulcanizates containing the different antioxidants in the presence or absence of coupling agents. Findings Results revealed that the Cu-LSF complex (5 phr) can function as a compatibilizing, antioxidant and electrical conductivity agent. Originality/value The new copper complex prepared from paper-pulping black liquor of wastes could be used as a green antioxidant and electrical conductivity agent in rubber composites.

Band Structure and Thermoelectric Properties of Ni(x)Zn(1-x)Fe2O4

2021 ◽  
Vol 317 ◽  
pp. 28-34
Author(s):  
Joon Hoong Lim
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Band Structure ◽  
Seebeck Coefficient ◽  
Band Gap ◽  
Thermoelectric Properties ◽  
Xrd Analysis ◽  
Valence Band Maximum ◽  
Solid State Method ◽  
Ni Content

Thermoelectric materials has made a great potential in sustainable energy industries, which enable the energy conversion from heat to electricity. The band structure and thermoelectric properties of Ni(x)Zn(1-x)Fe2O4 have been investigated. The bulk pellets were prepared from analytical grade ZnO, NiO and Fe2O3 powder using solid-state method. It was possible to obtain high thermoelectric properties of Ni(x)Zn(1-x)Fe2O4 by controlling the ratios of dopants and the sintering temperature. XRD analysis showed that the fabricated samples have a single phase formation of cubic spinel structure. The thermoelectric properties of Ni(x)Zn(1-x)Fe2O4 pellets improved with increasing Ni. The electrical conductivity of Ni(x)Zn(1-x)Fe2O4 pellets decreased with increasing Ni content. The electrical conductivity of Ni(x)Zn(1-x)Fe2O4 (x = 0.0) is (0.515 x10-3 Scm-1). The band structure shows that ZnxCu1-xFe2O4 is an indirect band gap material with the valence band maximum (VBM) at M and conduction band minimum (CBM) at A. The band gap of Ni(x)Zn(1-x)Fe2O4 increased with increasing Ni content. The increasing band gap correlated with the lower electrical conductivity. The thermal conductivity of Ni(x)Zn(1-x)Fe2O4 pellets decreased with increasing Ni content. The presence of Ni served to decrease thermal conductivity by 8 Wm-1K-1 over pure samples. The magnitude of the Seebeck coefficient for Ni(x)Zn(1-x)Fe2O4 pellets increased with increasing amounts of Ni. The figure of merit for Ni(x)Zn(1-x)Fe2O4 pellets and thin films was improved by increasing Ni due to its high Seebeck coefficient and low thermal conductivity.

Influence of Carbon Concentration as Coating on Electrical Conductivity of LiFeSi0.03P0.97O4/C

2021 ◽  
Vol 1028 ◽  
pp. 185-190
Author(s):  
Hafizhah Ellora Della ◽  
Mochamad Zainuri ◽  
Pelangi Az Zahra ◽  
Puri Olyvia Swastika ◽  
Triwikantoro
Keyword(s):  
Electrical Conductivity ◽  
Carbon Concentration ◽  
Research Study ◽  
Raw Materials ◽  
Carbon Sources ◽  
Xrd Analysis ◽  
Si Doping ◽  
Diffraction Peaks ◽  
Materials Used ◽  
Carbon Concentrations

This research study about the influence of carbon concenttration as coating on electrical conductivity of LiFeSi0.03P0.97O4/C. Synthesis of LiFeSi0.03P0.97O4/C was carried out different carbon concentrations of 7, 9, and 11 wt%. The raw materials used are Fe2O3, Li2CO3, (NH4)2HPO4, SiO2 as ion Si doping, and glucose as carbon sources. The XRD analysis results showed that all the diffraction peaks in samples were the olivine LiFePO4 phase. From the EIS result, Samples with the addition carbon concentration of 9 wt% produce the highest electrical conductivity values of 4.18 x 10-7 S/cm.

Mechanical and Electrical Properties of Carbon Nanotube / Polydimethylsiloxane Composites Yarn

2016 ◽  
Vol 11 (4) ◽  
pp. 155892501601100 ◽  
Author(s):  
Wei Liu ◽  
Fujun Xu ◽  
Nianhua Zhu ◽  
Shuang Wang
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Carbon Nanotube ◽  
Electrical Properties ◽  
Strain Sensors ◽  
Electromechanical Properties ◽  
Average Strength ◽  
Mechanical And Electrical Properties ◽  
Carbon Nano Tube ◽  
Droplet Infiltration

Carbon nano tube (CNT) yarn is an axially aligned CNT assembly. It has great potential many applications. In this study, the mechanical and electrical properties of the aerogel-spun CNT yarns and CNT/Polydimethylsiloxane (PDMS) composite yarns were investigated. The CNT/PDMS yarn was fabricated by droplet infiltration of PDMS solution into the aerogel-spun CNT yarn. The mechanical properties of the CNT/PDMS yarns were significantly improved with an average strength of 837.29 MPa and modulus of 3.66 GPa, over 100% improvement compared to the original CNT yarns. The electrical conductivity of the CNT/PDMS yarn increased from 1636 S/cm to 3555 S/cm. The electromechanical properties of CNT/PDMS yarns demonstrated that such CNT yarn could be suitable for strain sensors.

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