Measuring Magnetic Susceptibility of Undercooled Co-Based Alloys with a Faraday Balance
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Retention behavior of ferroelectric memory devices depending on the capacitor processes
Retention characteristics of a ferroelectric random access memory (FRAM) devices are strongly influenced by the integration processes and the ferroelectric material itself. In this study, we investigated the retention behavior of the PZT-based 4Mbit FRAM devices. Various heat treatment conditions were introduced to cr…
Polysulfite, a hypothetical allotrope of sulfur dioxide? A molecular and periodic quantum investigation of covalent oligomeric and one-dimensional XO2-based compounds (X=S, Se)
Covalent oligomeric and polymeric phases of SeO2 and SO2 have been investigated at high levels of density functional calculations on molecular and periodic models. Polysulfite [–S(O)O–]x, a one-dimensional allotropic form of SO2, is calculated to be energetically less stable than free molecular sulfur dioxide by less…
NOx decomposition by discharge plasma reactor.
In a nitrogen stream under an atmospheric condition, NOx decomposition was investigated using two discharge-plasma systems, such as a Dielectric Barrier Discharge (DBD) and Packed Bed Reactor (PBR). In the absence of oxygen, the decomposition in the former system started at input voltage of 1kV and showed 100% convers…
Crystal structure of tris(acetyIacetonato)iron(III), C15H21O6Fe, at 20 Κ
Article Crystal structure of tris(acetyIacetonato)iron(III), C15H21O6Fe, at 20 Κ was published on April 1, 2001 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 216, issue 1-4).
Novel approach to dynamic imaging of stress distribution with piezoluminescence
The dynamic imaging of stress distribution has been realized by developing remarkably strong piezoluminescence films of ZnS doped with Mn. A simulation result confirms that such a piezoelectric image successfully reflects the stress distribution. This piezoluminescence of ZnS:Mn can be explained by a model based on th…
Low frequency characterisation of laser ablation deposited thinNa0.5K0.5NbO3(NKN) films for microwave application
Experimental results on three types of Na0.5K0.5NbO3 (NKN) film capacitor structures are presented. The epitaxial NKN thin films have been deposited on (100) Si (high resistivity), SiO2/Si (low resistivity) and Pt/Si (low resistivity) substrates using laser ablation deposition. Both straight slot and interdigital elec…
Structure-property relation in varieties of silk fibers
Crystallite shape ellipsoid in different varieties of silk fibers namely (i) Chinese (ii) Indian, and (iii) Japanese, has been computed using wide-angle X-ray data and Hosemann's one-dimensional paracrystalline model. The estimated microcrystalline parameters are correlated with the observed physical property of the s…
Preparation and annealing process of Y3Fe5O12by sol-gel method
Yttrium iron garnet (YIG) powders were prepared by sol-gel process. The synthesis parameters including pH values, molar ratio, reactive temperature and time and annealing treatment were studied for formation reaction of single phase YIG. The transformation of precursor to gel and to crystalline phase were determined b…
Etch Behavior of Pb(Zr[sub X]Ti[sub 1−X])O[sub 3] Films Using a TiO[sub 2] Hard Mask
Dry etching of lead zirconate titanate (PZT) thin film and Pt/PZT stack structure was investigated using a hard mask in an inductively coupled plasma (ICP). An annealed thin film was employed as an etch mask for PZT and Pt/PZT stack etching. Etch characteristics of PZT thin films were examined with etch chemistry in t…
450 °C Isothermal Section of the Fe-Zn-Si Ternary Phase Diagram
The 450 °C isothermal section of the Fe-Zn-Si ternary phase diagram has been determined experimentally using optical microscopy, scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry. The focus of the work has been concentrated on the Zn-rich corner which i…
XPS Analysis of Ni and Oxygen in Single-Sintered SrTiO_3 Multifunction Ceramic
XPS analyses have been performed to investigate the chemical conditions of Ni and oxygen on grain surfaces in single-sintered SrTiO3 capacitor-varistor ceramic doped with Nb2O5 and NiO. It is ascertained that Ni is in form of Ni2+ ions, which substitute for Ti4+ ions on grain surfaces during the oxidizing annealing. M…
The influence of strain on defect generation by displacement cascades in α-iron
Abstract Although there have been numerous computer-simulation studies of the damage created by displacement cascades in metals, little attention has been paid to the influence of stress on defect generation in the primary cascade process. In the present work, molecular dynamics (MD) has been used to investigate defec…
Fully Rod-like Aromatic Polyimides: Structure, Properties, and Chemical Modifications
Poly(p-phenylene pyromellitimide) and poly(4,4'-biphenylene pyromellitimide) are representatives of fully rod-like polyimides. Their structure and properties in thin films are reviewed. The polymers exhibit some excellent properties such as high molecular packing coefficient, high mechanical modulus, and low…
External Electromagnetic Field Induced Electronic Structures and Novel Optical Functions of Rare-Earth-Ion-Doped Glasses.
We researched the realization of novel optical functions of glass by combining an external electromagnetic field induced electronic structure and rare-earth-ions. We reviewed the phenomena, mechanisms, and the applications of photostimulated luminescence induced by X-ray, long-lasting phosphorescence by ultra-violet l…
Novel photo-induced deracemization of [Co(acac)3] (acac = acetylacetonate) with a chiral ruthenium(II) complex, Δ-[Ru(menbpy)3]2+ (menbpy = 4,4′-bis{(1R,2S,5R)-(−)-menthoxycarbonyl}-2,2′-bipyridine). Reaction mechanism and significant effects of solvent and anion †
Deracemization of a racemic mixture of Δ- and Λ-[Co(acac)3] (acac = acetylacetonate) took place with a chiral ruthenium(II) complex, Δ-[Ru(menbpy)3]2+ (menbpy = 4,4′-bis{(1R,2S,5R)-(−)-menthoxycarbonyl}-2,2′-bipyridine), under visible light (420 < λ < 470 nm) irradiation in the presence of either triethylamine or NaOH…
On the Activation Energies Observed in Al-based Materials Deformed at Ultrahigh Temperatures
This study examines the exceptionally high activation energies estimated fi om data obtained from various composites exhibiting high strain rate superplasticity and loaded at ultrahigh temperatures near or slightly above the solidus. It is shown that the activation energies for the 6061 composite and for Al 6061 and 1…
Corrosion Behavior and its Countermeasures of Copper for Building Materials
Corrosion behaviors and its countermeasures of copper used for building materials such as roofs and water supply systems in detached houses, apartments and buildings have been reviewed. The corrosion phenomena of pitting corrosion, erosion corrosion and cuprosolvency troubles are discussed based on both empirical data…
Bioferroelectricity and related problems: Hydrogen-bonded ferroelectric-like systems
Short review of bioferroelectricity and related problems is presented. One of the important cases the hydrogen-bonded systems, are analysed in detail. The proposed model describes the soliton-like dynamics of hydrogen-bonded ferroelectrics with two interacting subsystems (protons and ordered ferroelectric) in the vici…
Tetrathiapentalene-based organic conductors with 1 ∶ 1 composition
We have prepared TTM-TTP-based (TTM-TTP = 2,5-bis[4,5-bis(methylthio)-1,3-dithiol-2-ylidene]-1,3,4,6-tetrathiapentalene) organic conductors with 1 ∶ 1 composition including tetrahedral anions in order to elucidate electronic properties of half-filled conductors. We have obtained three new 1 ∶ 1 composition salts (TTM-…