Materials Literature
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An important part of the investigation into the loss of the Space Shuttle Columbia was numerical modeling of the foam impact event. Because of this work, as well as the failure during flight of available tools to provide helpful information, the Columbia Accident Investigation Board recommended the development of phys…
QSSPC (quasi-steady-state photo-conductance) is a well-known technique for lifetime measurement, but up to now its use has been limited to silicon. In this paper we describe a simple method to extend this technique to germanium samples. The significant differences between silicon and germanium are separately analyzed.…
In this paper, CdSe (nanotubes, nanorods) and ZnSe (nanorods, nanoslats) were simultaneously synthesized through a biomineralization process through biomembrane bitemplates of mungbean sprouts at room temperature. The XRD patterns indicated that these nanocrystals were crystallized in the hexagonal structure and cubic…
Photochemical deposition of silver nanoparticles in poly(butyl acrylate) and poly(butadiene-styrene) under the action of monochromatic UV light (254 nm) was studied. Changes in the polymer structure in the course of photolysis were revealed and analyzed. A mechanism of formation of silver nanoparticles was suggested.…
Sensitometric and holographic properties of photoresist layers made from carbazolylalkyl methacrylate copolymers and polyepoxypropylcarbazole sensitized with triiodomethane and, additionally, spiropyran photochromic compounds were studied. It was found that the introduction of photochromic 6′-bromo-8′-nitro-1,3,3-trim…
A review is presented of the data available in the literature on the thermodynamic properties and structure of gaseous metaborates studied by high-temperature mass spectrometry, gas-phase electron diffraction, spectroscopy, and quantum-chemical methods. The reliability and inconsistency of the thermodynamic properties…
This work first studied the magnetic properties of obliquely deposited granular Co-Zr-O films. It was found that the oblique deposition induces increased hysteresis and decreased permeability in the films, which leads to larger loss and less inductance in the micro-inductor applications. Applying substrate bias during…
The concept of micron scale two-phase self–healing process is dissected. The limits imposed on the self-healing formulation by the rough conditions of the space environment are scrupulously discussed. The possibility to add such capabilities to materials relevant to space exploration is analyzed in detail. The encapsu…
The reduction of Ni-Mg aluminosilicates with the amesite structure was studied using thermogravimetry, high-resolution electron microscopy, XPS, and XRD. It was found that the reduction with hydrogen at 920 K resulted in the formation of nickel particles coated with a difficult-to-reduce amorphous oxide shell. The red…
Single-crystal X-ray diffraction has yielded new crystal structures for cesium formate (CsOOCH) and rubidium formate (RbOOCH). The cesium formate structure has the same unit cell and space group as that published from powder X-ray diffraction data but differs radically in the placement and orientation of the formate i…
The structures of diamond-like carbon (DLC) films, including a-C:H, a-C, ta-C:H and ta-C films have been investigated as a random covalent network with a dense film structure. The results show that sp 2 C in a-C:H and a-C films tends to form olefinic and aromatic groups while sp 3 C in ta-C:H and ta-C films tends to f…
Fine BaTiO 3 powders have been prepared by using barium hydroxide (Ba(OH) 2 ) and titanium peroxo-hydroxide (TiO 2 (OH) 2 ) as precursors through hydrothermal synthesis. Ba(OH)2 was used as a barium precursor as well as a pH adjustment agent instead of strong alkaline mineralizers, KOH or NaOH. The present study shows…
The electrical properties (loss tangent, real (ε) and imaginary (ε″) parts of complex dielectric permittivity, and ac conductivity across the layers) of TlGa 1 − x Mn x S 2 (0 ≤ x ≤ 0.03) layered single crystals have been studied in the frequency range f = 5 × 10 4 to 3.5 × 10 7 Hz. The results demonstrate that the di…
Abstract Rutherford backscattering (RBS) and particle‐induced X‐ray emission (PIXE) experiments were performed on (Ga,Mn)N epilayers and self‐organized dots grown by plasma‐assisted MBE. The combined channeling RBS and Mn PIXE experiments were performed on Ga 0.949 Mn 0.051 N epilayer, which was confirmed to be of pur…
Abstract Some ideas are presented on the geometrical factors governing structure and formation of axial quasicrystals with 5- and 7-fold symmetry, respectively. First, the importance of thin atomic layers is discussed for the growth of decagonal quasicrystals. They are the only long-range ordered structural units carr…
A geometric topological analysis of orthotetrahedral phases M x (TO4)y (T = S or Se) is performed for 46 sulfates and 17 selenates with the TOPOS 3.2 software package. The values of coordination sequences {N k } of T atoms are used as classification parameters of topologically different MTO nets. The crystal structure…
Two valence states of tin atoms in (As 2 Se 3 ) 1 − z (SnSe) z − x (GeSe) x and (As 2 Se 3 ) 1 − z (SnSe 2 ) z − x (GeSe 2 ) x glasses are identified by Mössbauer and photoelectron spectroscopy. It is demonstrated that the presence of doubly charged tin ions in the structural glass network does not give rise to impuri…
In this paper, the authors propose a simple and numerically efficient interpolation algorithm capable to approximate the First Order Reversal Curves (FORC) distribution in any point. Using this algorithm as input for a classical Preisach Model one can obtain the magnetization curves of the system used in FORC measurem…
In this paper, changes in magnetic properties and microstructures of sintered Nd-Fe-B magnets that had undergone grain boundary diffusion will be discussed.
The reactions of the intermetallic compounds Sc 2 Al and Sc 2 Ni with hydrogen have been investigated. The results demonstrate that Sc 2 Ni reacts with hydrogen even at room temperature, to form amorphous Sc 2 NiH 5 . The reaction is irreversible at room temperature. Vacuum extraction of hydrogen between room temperat…