Journal of Materials Science
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Crystallization kinetics of Ni-P glass — activation energies for nucleation and growth of nuclei
Journal of Materials Science - Tập 23 - Trang 3001-3005 - 1988
A pre-anneal treatment was introduced to a melt-spun Ni-P alloy. By crystallizing the asquenched and pre-annealed samples in a differential scanning calorimeter at different heating rates and isothermal process, the apparent activation energies for the total crystallization of the Ni-P samples were obtained by using the Kissinger technique and the Arrhenius relation. It was found that the apparent......
Electrical transport properties of amorphous Se78−x Te22Bi x films
Journal of Materials Science - Tập 38 - Trang 549-554 - 2003
D.C. Conductivity measurements on the thin films of a-Se78−x
Te22Bi
x
system (where x = 0, 0.5, 2 and 4) are reported in the temperature range 213–390 K and the density of states (DOS) near the Fermi level is calculated using dc conductivity data. It is found that the conduction in all the samples takes place in the tails of localized states. The conduction in t......
Deformed metals and alloys with a structural scale from 5 nm to 100 nm
Journal of Materials Science - Tập 42 - Trang 1682-1693 - 2007
The processing, structure and properties of deformed metals and alloys with a structural scale from the micrometer to the nanometer dimensions has been the subject of a recent viewpoint set [1]. The present paper will focus on deformed metals and alloys with a structural scale from 5 nm to 100 nm, concentrating on materials processed by high pressure torsion (HPT), surface mechanical attrition tre......
Synthesis of corrosion inhibitive poly(2,5-dimethylaniline) coatings on low carbon steel
Journal of Materials Science - Tập 41 - Trang 2851-2858 - 2006
An attempt has been made towards the synthesis of strongly adherent poly(2,5-dimethylaniline) coatings on low carbon steel substrates, with an objective of examining the possibility of using this polymer for corrosion protection of steel in chloride environment. In this work, the poly(2,5-dimethylaniline) coatings were synthesized by electrochemical polymerization of 2,5-dimethylaniline using sodi......
Characterization of clay composite ballistic witness materials
Journal of Materials Science - Tập 50 - Trang 7048-7057 - 2015
Mechanical and thermal properties of Roma Plastilina Clay #1 (RP1) were studied through small-amplitude oscillatory shear (SAOS), large-amplitude oscillatory shear (LAOS), and differential scanning calorimetry (DSC), supplemented with thermogravimetric analysis, X-ray diffraction, and X-ray florescence. Rheological characterizations of RP1 through SAOS indicate that the clay composite softens as i......
Metal–organic framework derived porous nanostructured Co3O4 as high-performance anode materials for lithium-ion batteries
Journal of Materials Science - Tập 56 - Trang 2451-2463 - 2020
Metal–organic frameworks (MOFs) are ideal self-sacrificial precursors for building materials with porous structures and high electrochemical performance because materials prepared with metal MOFs as precursors have the advantages of high porosity, diverse structures, and large surface area. In this work, porous nanostructured Co3O4 particles were prepared by using cobalt-based MOFs as a precursor,......
Fabrication and characterization of anisotropic dielectrics for low-loss microwave applications
Journal of Materials Science - Tập 43 - Trang 1505-1509 - 2008
New magneto-photonic assembly designs for high-gain antennas require dielectrics with a significant anisotropy and low loss at GHz frequencies. This paper describes an approach to fabricate such dielectrics from ceramic laminates. These laminates consist of two ceramics with largely different permittivities and low dielectric losses. Alternating layers of commercially available α-Al2O3 and Nd-dope......
Shear thickening of suspensions of porous silica nanoparticles
Journal of Materials Science - Tập 50 - Trang 6041-6049 - 2015
In this work, shear thickening (ST) performance of a novel suspension of porous silica nanoparticles was systematically studied. The porous silica nanoparticles which were synthesized by using CTAB as a pore-forming agent were dispersed into ethylene glycol to form shear thickening fluid (STF). Both the steady and oscillatory shear rheological properties of the STF were characterized. The STF show......
Preparation, sintering, and microstructures of strontium barium bismuth tantalate layered perovskite ceramics
Journal of Materials Science - Tập 39 - Trang 3079-3083 - 2004
The solid solutions of Ba-doped SrBi2Ta2O9 layered perovskite ceramic powders have been successfully prepared via a two-step process using BiTaO4 as a precursor. The lattice constants of the solid solutions monotonically increase with increasing barium-ion content. The sinterability of (Sr1−xBax)Bi2Ta2O9 powders is significantly improved by increasing the barium-ion content. When the specimens wit......
Sintering and properties of highly donor-doped barium titanate ceramics
Journal of Materials Science - Tập 35 - Trang 895-901 - 2000
The electrical properties of donor (La3+) doped BaTiO3 samples with a donor concentration in the range from 0.3 to 1.5 mol.% of La were studied. Samples were sintered at a low partial pressure of oxygen in order to facilitate anomalous grain growth and donor incorporation. In order to optimise the PTCR anomaly, the samples were annealed in air at 1100°C. Results show that with the use of a specifi......
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