Features of the Post-Deformation Hardening of Fe-Cr-Co Hard Magnetic Alloys with W and Ga Additives

2009 ◽  
Vol 152-153 ◽  
pp. 54-57 ◽  
Author(s):  
E.V. Belozerov ◽  
N.N. Shchegoleva ◽  
G.V. Ivanova ◽  
N.V. Mushnikov
Keyword(s):  
Electron Microscopy ◽  
Magnetic Material ◽  
Magnetic Properties ◽  
Magnetic Alloys ◽  
Hard Magnetic Material ◽  
X Ray ◽  
Electron Microscopy Analysis ◽  
Deformation Hardening ◽  
Microscopy Analysis ◽  
Strength And Plasticity

The structure, mechanical and magnetic properties have been studied for Fe-Cr-Co-based hard magnetic alloys with W and Ga additives, subjected by the quenching and post-deformation hardening. The alloys combine the properties of the hard magnetic material with outstanding mechanical strength and plasticity. Using X-ray and electron microscopy analysis, the reasons and conditions of formation of these properties have been determined.

scholarly journals Synthesis and Characterization of Silver Nanoparticles from Ethanolic Extracts of Leaves of Annona muricata: A Green Nanobiotechnology Approach

2019 ◽  
pp. 1-18 ◽  
Author(s):  
Yahaya Gavamukulya ◽  
Esther N. Maina ◽  
Fred Wamunyokoli ◽  
Amos M. Meroka ◽  
Edwin S. Madivoli ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Green Synthesis ◽  
Infrared Analysis ◽  
Annona Muricata ◽  
Medicinal Uses ◽  
X Ray ◽  
Ethanolic Extracts ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis

Introduction: The biological green synthesis of nanoparticles via nanobiotechnology processes have a significant potential to boost nanoparticles production without the use of harsh, toxic, and expensive chemicals commonly used in conventional physical and chemical processes. Annona muricata, a tropical plant belonging to family Annonaceae is one of the most used plants in folk medicine because of its many medicinal uses and therefore presents a strong candidate for use in green synthesis. Aims: The aim of this study was to optimize a method for the synthesis of Silver Nanoparticles (AgNPs) from ethanolic extracts of leaves of Annona muricata as well as to characterize the green synthesized AgNPs. Methodology: AgNPs were synthesized from Annona muricata leaves using AgNO3 solution. The AgNPs were characterized using spectroscopy and microscopy techniques. Results: The formed AgNPs had an absorption maximum at 429 nm using UV–Visible spectroscopy and were stable under different pH, temperature, and storage conditions. Fourier transform infrared analysis revealed the different functional groups responsible for the synthesis and stabilization of the AgNPs. Scanning electron microscopy analysis revealed a spherical nature of the synthesized AgNPs. Energy dispersive x-ray spectroscopy analysis showed presence of Ag, O, and Cl with Ag having the highest composition at 60%. X-Ray Diffraction and Dynamic Light Scattering revealed a crystalline nature of AgNPs with an average size of 87.36 nm and a polydispersity index of 0.16 respectively. Transmission Electron Microscopy analysis further confirmed the crystalline and spherical nature of the AgNPs. Conclusion: In this article, an efficient, eco-friendly and low-cost method for the synthesis and recovery of stable AgNPs using Annona muricata leaves ethanolic extracts as both a reducing and capping agent has been reported for the first time. The synthesized AgNPs could be promising candidates for many biomedical, clinical, engineering, and polymer applications.

Electron Microscopy Studies of Potassium Sodium Niobate Ceramics

2005 ◽  
Vol 11 (6) ◽  
pp. 572-580 ◽  
Author(s):  
Darja Jenko ◽  
Andreja Benčan ◽  
Barbara Malič ◽  
Janez Holc ◽  
Marija Kosec
Keyword(s):  
Electron Microscopy ◽  
Secondary Phase ◽  
Nominal Composition ◽  
Potassium Sodium Niobate ◽  
Transmission Electron Microscopy Analysis ◽  
X Ray ◽  
Transmission Electron ◽  
Ferroelectric Domains ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis

Using electron microscopy, K0.5Na0.5NbO3 (KNN) ceramics sintered at 1030°C for 8 h and 1100°C for 2 and 24 h was studied. The scanning electron microscopy and X-ray spectrometry revealed that the materials consisted of a matrix phase in which the (Na+K)/Nb ratio corresponded closely to the nominal composition and a small amount of Nb-rich secondary phase. A bimodal microstructure of cube-shaped grains was revealed in the fracture and thermally-etched surfaces of the KNN. In the ceramics sintered at 1100°C, the larger grains (up to 30 μm across), contained angular trapped pores. The transmission electron microscopy analysis revealed that the crystal planes of the grains bordering the intragranular pore faces were of the {100} family with respect to the simple perovskite cell. Ferroelectric domains were observed in the grains of this material.

Production of 3Y-PSZ Powders by Co-Precipitation and Milling

2008 ◽  
Vol 54 ◽  
pp. 50-55
Author(s):  
Erika Furlani ◽  
Eleonora Aneggi ◽  
Stefano Maschio
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Amorphous Powder ◽  
X Ray Diffraction ◽  
X Ray ◽  
Attrition Milling ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Co Precipitation ◽  
Scanning Electron

The present research compares properties and behaviour of co-precipitated 3Y-PSZ powders submitted, after co-precipitation, to different milling treatments. The characteristics of the different products were evaluated by measurement of particle size distribution, thermogravimetric analysis, X-ray diffraction, specific surface area and scanning electron microscopy analysis. It has been demonstrated that 1h of attrition milling enables the production of powders with micrometric particles: the dispersing liquid used on milling has little influence. Crystallization of the amorphous powder is achieved after 1h of high energetic milling, without any thermal treatment.

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