Materials Literature
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Well-resolved isotropic EPR spectra were observed for Si(CH3)4+ (TMS+), Si(CH3)3CD3+ (TMS-d3+) and Si(CH3)2(CD3)2+ (TMS-d6+), generated by ionizing radiation in SnCl4 matrices at 77 K. The TMS+ radical has been reported to have a C2v structure possessing two apical methyl groups with long Si–C bonds and two equatorial…
This paper deals with the performance of alumina sol, prepared from a cheaper precursor and used as a bonding agent in no-cement refractory castables fabricated by simple tapping technique. The physical properties of sol-bonded-castables indicate a significant improvement at elevated temperatures. The beneficial role…
Abstract The simple rules, based on the bond-valence matching and coordination numbers balance, are extended to minimum-size polyhedral cluster in order to describe all probable bonding topologies for a given inorganic substance. This approach, referred to as the Extended Bond-Valence Model (EBVM), allows one to const…
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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…
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…
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…
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).
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…
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…
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…
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…
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…
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 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…
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…
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…
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…
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…
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…