Materials Literature
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The effects of the partial substitution of Mn by Co on the magnetic, magnetoelastic, and magnetocaloric properties of Ni50Mn35In15 Heusler alloys were studied using x-ray diffraction, temperature and field dependences of the magnetization [M(T,H)], and strain gauge techniques. It was observed that the presence of ≈3%…
Multiferroic solid solutions of (Pb0.8Sm0.2)(Ti0.8Fe0.2)O3 are synthesized by conventional solid-state reaction. Microstructure property relationship has been studied and it is shown that the multiferroic properties in the sample are dependent on sintering temperature. The sample sintered at 1200 °C exhibits optimal p…
The energy loss functions (ELFs) and optical constants of Si and SiO2 were obtained from quantitative analysis of reflection electron energy loss spectroscopy (REELS) by a new approach. In order to obtain the ELF, which is directly related to the optical constants, we measured series of angular and energy dependent RE…
Silicon containing diamondlike carbon (Si-DLC) films were prepared on silicon wafer substrates by a plasma source ion implantation method with negative pulses superposed on a negative dc voltage. A mixture of acetylene and tetramethylsilane gas was introduced into the discharge chamber as working gases for plasma form…
The magnetic properties of 10 nm size Ni(OH)2 nanoparticles prepared by sol-gel method have been studied. The magnetic moments increase with decreasing temperature in a low applied field, which is due to the spin-frozen-like state at low temperatures, and the metamagnetic transition is not clearly observed even in an…
Recently we reported synthesis and characterization of a monodisperse thiolate-protected Ag 7 cluster. Here we show in detail that a unique series of silver sulfide cluster anions (Ag n S 4 − ) were observed sequentially from n = 7 to 1 when subjecting the thiolate-protected Ag 7 cluster to an MS/MS experiment. Random…
Abstract We have synthesized 1,4,7,10‐tetraisoalkyltetracenes from a 2,6‐naphthodiyne precursor and 2,5‐diisoalkylfurans as the starting materials (isoalkyl: isopropyl, isobutyl, and isopentyl). The tetracene molecules exhibited crystallochromy: The solid‐state colors of the isopropyl, isobutyl, and isopentyl derivati…
Yttrium phosphate co-doped with cerium and samarium acts as a charge storage phosphor, but in highly doped material (0.5% co-doping levels), the proximity of defects leads to the uncontrolled non-radiative loss of stored charge through tunnelling. In order to characterize these defects, their mutual interactions and i…
The reaction of potassium 2,5-bis[N-(2,6-diisopropylphenyl)iminomethyl]pyrrolyl [(dip(2)-pyr)K] with the borohydrides of the larger rare-earth metals, [Ln(BH(4))(3)(thf)(3)] (Ln=La, Nd), afforded the expected products [Ln(BH(4))(2)(dip(2)-pyr)(thf)(2)]. As usual, the trisborohydrides reacted like pseudohalide compound…
In an effort to understand the impact of nanostructuring on the magnetocaloric effect, we have grown and studied gadolinium in MgO/W(50 Å)/[Gd(400 Å)/W(50 Å)]8 heterostructures. The entropy change associated with the second-order magnetic phase transition was determined from the isothermal magnetization for numerous t…
Introductory physics courses present the basic concepts of radioactivity and an overview of nuclear physics that emphasizes the basic decay relationship and the various types of emitted radiation. Although this presentation provides insight into radiological science, it often fails to interest students to explore thes…
Composite magnets containing Sm–Co and Co phases were prepared from high-energy-milled Sm–Co and Sm–(Co,Fe,Mn) powders with the 1:5 and 2:7 stoichiometries blended with a micron-size Co powder. The blending was done via high-energy milling in argon or heptane; the blends were subsequently consolidated at 650 °C and su…
The optical absorption of defect centers in SrTiO3 substrates grown by the Vernuil method are investigated using photoinduced electron paramagnetic resonance (photo-EPR) at room temperature. As received samples revealed EPR signatures for Fe3+, Cr3+, Mn4+, and an iron-oxygen vacancy complex, Fe3+VO. An anneal in dry o…
We have previously demonstrated a fabrication technique for the creation of silicon wire grid polarizers (WGPs) for far (deep) ultraviolet applications utilizing a shear-aligned cylinder-forming polystyrene-b-poly(n-hexyl methacrylate) diblock copolymer as a mask for reactive ion etching of an amorphous silicon substr…
It is shown, by DFT calculations, that the uniform functionalization of the upper layer of graphite by hydrogen or fluorine does not change essentially its bonding energy with the underlying layers, whereas the functionalization by phenyl groups decreases the bonding energy by a factor of approximately ten. This means…
An interfacial buffer layer has been developed to improve the silicon oxide (SiOx) hard coating adhered to a flexible plastic substrate through a consecutive plasma-enhanced chemical vapour deposition process, using the same organosilicon precursor. The adhesion of the hard coating structure, correlated with the buffe…
The structure and magnetic properties were studied for bulk nanocrystalline SmCo5 sintered magnet produced by spark plasma sintering technique. X-ray diffraction patterns show that the sintered magnet exhibits CaCu5 crystal structures. Transmission electron microscopy (TEM) observation indicates the average grain size…
In this study, the influence of the addition of carbon nanotube (CNT) (0, 0.5, 1.0, and 2.0 wt %) on complex permittivity, complex permeability, and reflection loss for La0.7Sr0.3MnO3−δ (LSMO)/polymer composites was investigated. Microwave absorbing composites were prepared by molding and curing a mixture of LSMO powd…
Blockcopolymere aus Poly(carboxybetain) (PCB) und Poly(milchsäure-co-glycolsäure) (PLGA) mit tBu-Gruppen als Teil der PCB-Monomere bilden außergewöhnlich stabile PLGA-Kern/PCB-Schale-Nanopartikel, die aufgrund der COO−-Gruppen in der PCB-Schale ein hohes Funktionalisierungspotenzial aufweisen (siehe Bild; EDC=1-Ethyl-…
In the present work, polyamide-Mg(OH)2 nanocomposites were prepared via melt intercalation on a twin-screw extruder. Different particle sizes (24, 20, 11 nm) of Mg(OH)2 were synthesized by in-situ deposition technique and its shape and sizes was confirmed on transmission electron microscope (TEM). Nano-Mg(OH)2 was add…