NICKEL AND LEAD ZIRCONIUM TITANATE MULTI-LAYERED MAGNETOELECTRIC COMPOSITES PREPARED BY ELECTROLESS DEPOSITION

2011 ◽  
Vol 25 (10) ◽  
pp. 723-729 ◽  
Author(s):  
KE BI ◽  
YIN-GANG WANG ◽  
DE-AN PAN ◽  
WEI WU
Keyword(s):  
Electron Microscopy ◽  
Direct Contact ◽  
Electroless Deposition ◽  
Zirconium Titanate ◽  
Lead Zirconium Titanate ◽  
Total Thickness ◽  
Saturation Magnetostriction ◽  
Magnetoelectric Composites ◽  
Voltage Coefficient ◽  
Scanning Electron

Magnetoelectric (ME) nickel and lead zirconium titanate multi-layers with neither electrodes nor bonding layers was developed by electroless deposition. Scanning electron microscopy reveals that the Ni layer is in direct contact with the PZT layer without inter-layer not only in Ni /PZT/ Ni trilayer but also in Ni /PZT/ Ni /PZT/ Ni multi-layer. The in-plane parallel magnetostriction has been measured for electroless deposited Ni . The saturation magnetostriction is 32.6 × 10-6. When the total thickness of multi-layers is the same, the ME voltage coefficient α E,31 decreases with increasing the stacking periodicity. On condition that the thickness of each layer is the same, the ME voltage coefficient V E,31 of the Ni /PZT/ Ni /PZT/ Ni multi-layer is nearly twice higher than that of the Ni /PZT/ Ni tri-layer at the resonance frequency, which provides a new choice to obtain higher ME voltage coefficient.

INFLUENCE OF INTERFACE AND POLARIZATION ON MAGNETOELECTRIC COUPLING IN Ni-LEAD ZIRCONIUM TITANATE-Ni TRILAYERS DERIVED BY ELECTROLESS DEPOSITION

2012 ◽  
Vol 19 (03) ◽  
pp. 1250030
Author(s):  
K. BI ◽  
Y. G. WANG
Keyword(s):  
Cross Section ◽  
Electroless Deposition ◽  
Mechanical Deformation ◽  
Interface Roughness ◽  
Zirconium Titanate ◽  
Interface Conditions ◽  
Lead Zirconium Titanate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Voltage Coefficient

Magnetoelectric (ME) coupling in layered structures of magnetostrictive and piezoelectric phases are mediated by mechanical deformation and depends strongly on the interface conditions. Ni -lead zirconium titanate- Ni trilayers with neither electrodes nor bonding layers have been derived by electroless deposition. The structure of the electroless deposited Ni layer was characterized by X-ray diffraction. The cross-section of the Ni/PZT layers was investigated using scanning electron microscopy. The value of ME voltage coefficient (αE,31) increases as the interface roughness increases. The maximum of αE,31 for the Ni/PZT/Ni trilayers polarized after electroless deposition is higher than that for the Ni/PZT/Ni trilayers polarized before electroless deposition. It is essential to optimize the interface and the polarization to obtain higher ME voltage coefficient.

scholarly journals NiCo-lead zirconium titanate-NiCo trilayered magnetoelectric composites prepared by electroless deposition

AIP Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 047142 ◽  
Author(s):  
M. H. Zhou ◽  
H. P. Fan ◽  
Z. S. Zhao ◽  
Y. G. Wang ◽  
K. Bi
Keyword(s):  
Electroless Deposition ◽  
Zirconium Titanate ◽  
Lead Zirconium Titanate ◽  
Magnetoelectric Composites

Nanocrystalline Barium Zirconium Titanate Synthesized by the Sonochemical Process

2013 ◽  
Vol 802 ◽  
pp. 119-123
Author(s):  
Supamas Wirunchit ◽  
Rangson Muanghlua ◽  
Supamas Wirunchit ◽  
Wanwilai Vittayakorn ◽  
Naratip Vittayakorn
Keyword(s):  
Crystal Structure ◽  
Electron Microscopy ◽  
Reaction Time ◽  
Single Phase ◽  
Zirconium Titanate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Large Particles ◽  
Barium Zirconium Titanate ◽  
Scanning Electron

Nanocrystalline barium zirconium titanate, BaZr0.4Ti0.6O3, was synthesized successfully via the sonochemical process. The effects of reaction time on the precipitation of Ba(Zr,Ti)O3 particles were investigated briefly. The crystal structure as well as molecular vibrations and morphology were investigated. X-ray diffraction indicated that the powders exhibited a single phase perovskite structure, without the presence of pyrochlore or unwanted phases at the reaction time of 60 min. Nanocrystals were formed before being oriented and aggregated into large particles in aqueous solution under ultrasonic irradiation. A scanning electron microscopy (SEM) photograph showed the BZT powder as spherical in shape with uniform nanosized features.

Failure Analysis of Metallic Orthopedic Implant for Total Knee Replacement

2020 ◽  
Vol 1012 ◽  
pp. 471-476
Author(s):  
Eurico F. Pieretti ◽  
Tomaz P. Leivas ◽  
Marina F. Pillis ◽  
Mauricio David Martins das Neves
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Direct Contact ◽  
Orthopaedic Implant ◽  
Orthopedic Implant ◽  
High Carbon ◽  
Hard Tissue ◽  
Total Knee ◽  
Causes Of Failure ◽  
Scanning Electron

Fractures resulting from wear and fatigue process have been identified as the main causes of failure in biomaterials, especially in implants that act in place of bone or other hard tissue, as they are subject to conditions involving severe cyclic loadings. In biomaterialscase, the types of failures mentioned above must also be evaluated under the effect of degradation or corrosion, due to the direct contact with body fluids. The present research analyzed the fatigue induced by corrosion fracture of an orthopaedic implant for total knee replacementproduced with an austenitic ASTM F138 stainless steel. The morphology, compositions of the interfaces and subsequent corrosive pitting were characterized by stereoscopy and scanning electron microscopy (SEM) coupled with energy dispersive spectroscopy (EDS). Stress concentration, inclusions and high carbon levels were the main reasons of failure.

scholarly journals Electroless Deposition of Composite Nickel-Phosphorous Coatings with Diamond Dispersoid

2016 ◽  
Vol 61 (2) ◽  
pp. 493-498 ◽  
Author(s):  
M. Petrova ◽  
M. Georgieva ◽  
V. Chakarova ◽  
E. Dobreva
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Composition ◽  
Electroless Deposition ◽  
Deposition Time ◽  
Composite Coatings ◽  
Flexible Substrates ◽  
Optimal Conditions ◽  
Sem Images ◽  
Scanning Electron

AbstractThe composite Ni-P coating with diamond particles (D) deposited on the flexible substrates of pressed polyethylene terephthalate material (PET) was obtained, to be used in the development of efficient, flexible grinding and polishing tools. The optimal conditions of the hydrodynamic regime, deposition time and temperature were found. The influence of the concentration and size of the D particles (3/7 ÷ 225/300 μm) on the coating thickness and number of co-deposited particles were studied. By Scanning Electron Microscopy (SEM) images were defined the morphology of dispersion coatings and number of co-deposited particles in them, and Energy Dispersive Spectroscopy (EDS/INCA) was used to determine the elemental chemical composition of the composite coatings.

Influence of Carbon Nanotubes on Wear of Carbide/Cobalt Micropunch

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Kelvii Wei Guo
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Scanning Electron Microscopy ◽  
Direct Contact ◽  
Laser Scanning ◽  
Contact Region ◽  
Confocal Laser ◽  
Wear Loss ◽  
Lubrication Film ◽  
Scanning Electron

Carbon nanotubes (CNTs) coated on a tungsten carbide/cobalt (WC/Co) micropunch (150 μm in diameter) and their effect on the wear of micropunches were investigated. CNTs were synthesized by homemade method. After the punching test with Ti as the substrate, the effect of CNTs on the wear loss and the surface morphology of the micropunch had been studied by confocal laser, scanning electron microscopy (SEM), and digital balance. Results show the wear of a CNTs coated micropunch obviously decreases. Even in the severe wear period, the wear loss is less than that of a non-CNTs coated micropunch. Compared with the micropunch without CNTs coating, the promising results are due to the formation of a lubrication film at the contact region by rubbing of the CNT forest; CNTs produced adhere to the micropunch surface avoiding direct contact during the punching period and providing lubricant properties to the interface by virtue of their graphitic nature.

Male cypris metamorphosis and a new male larval form, the trichogon, in the parasitic barnacle sacculina carcini (crustacea: cirripedia: rhizocephala)

1987 ◽  
Vol 317 (1183) ◽  
pp. 47-63 ◽  
Keyword(s):  
Electron Microscopy ◽  
Direct Contact ◽  
Nervous Tissue ◽  
Simple Structure ◽  
Mantle Cavity ◽  
Sense Organs ◽  
Dwarf Male ◽  
Larval Form ◽  
Sacculina Carcini ◽  
Scanning Electron

Virgin externae of the parasitic barnacle Sacculina carcini Thompson were exposed to settlement of male cyprids. The events from settlement around the mantle aperture to arrival of the male cypris cells into the receptacle of the externa were studied by transmission and scanning electron microscopy. A small, hitherto unknown larva, the trichogon, escapes from the cyprid within ca. 20 min after settlement. A thin cuticle armed with long spines is preformed beneath the carapace of the male cyprid, and after metamorphosis this cuticle encloses the free trichogon. The trichogon is up to 220 μm long, unsegmented, has a variable amoeboid shape and a very simple structure. It includes parts of the cypris epidermis and two other types of cypris cells, but it has no appendages, muscles, sense organs or nervous tissue. The trichogon migrates through the mantle cavity of the externa and arrives at the entrance to the receptacle duct within 2 h after settlement. During the ensuing migration through the receptacle duct, the trichogon loses its spine-armed cuticle. Once inside the receptacle, the trichogon cells and the female cells of the receptacle are in direct contact, with no intervening cuticle. The implanted trichogon is regarded as a very specialized dwarf male. The formation of the trichogon from male cyprids, and of the kentrogon from female cyprids has many similarities, and the trichogon and the kentrogon are regarded as homologous instars. A trichogon is present in the Sacculinidae, the Lernaeodiscidae and most probably also in the Peltogastridae; i.e. in the same families where a kentrogon has been demonstrated to accomplish invasion of the decapod host.

TUNABLE RESONANT FREQUENCY OF FeCo/PZT/FeCo CYLINDERS

2013 ◽  
Vol 27 (28) ◽  
pp. 1350173 ◽  
Author(s):  
H. Q. SHEN ◽  
Y. G. WANG
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Resonant Frequency ◽  
Radial Direction ◽  
Electroless Deposition ◽  
Magnetoelectric Coupling ◽  
Layered Composites ◽  
Hollow Cylinders ◽  
Magnetoelectric Coefficient ◽  
Scanning Electron

FeCo / PZT / FeCo cylindrical heterostructures were prepared by electroless deposition. Scanning electron microscopy shows that the magnetostrictive FeCo layers are in contact with piezoelectric PZT directly. To control the resonant frequency at which the magnetoelectric coupling shows an obvious improvement, the height of cylinder needs to be taken into consideration. In the present work, three hollow cylinders with different height were polarized along the radial direction. It was shown that with the increase of cylinder height the magnetoelectric coefficient increased. Both experimental and calculated results show that the resonant frequency of FeCo / PZT / FeCo cylindrical layered composites decreases with increasing the cylinder height. Proper resonant frequency and strong ME effect could be obtained by optimizing the configuration.

Sign in / Sign up

Export Citation Format

Share Document