Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Barium zirconate shows better chemical and mechanical stability than the corresponding cerate, but lower protonic conductivity largely due to resistive grain boundary contributions. In this work we attempted to reduce the grain boundary resistance of BaZr0.9Y0.1O2.95 starting from a core–shell modification of its grai…
Nanotechnology is a revolutionary scientific and engineering concept that will have a large impact on our life. A core piece of this technology is the production of nanomaterials for electronic, chemical, medical, pharmaceutical, and environmental applications. In the last case, natural and modified natural nanomateri…
The hydrogen adsorption of mesoporous carbon materials with different mesostructures, surface areas, and pore volumes has been investigated. Experimental results indicate that the hydrogen adsorption capacities are dominantly related to their surface areas. A hydrogen adsorption capacity of 1.78 wt % was obtained at 7…
The relaxor type of ferroelectric material Ba(FeNb)1∕2O3, which has a partially disordered perovskite structure, has been characterized and shown a maximum plateau of the dielectric permittivity depending upon the temperature. The dielectric constant at a low frequency is up to 30 000 at room temperature. While the si…
Magnetite epitaxial thin films have been prepared by pulsed laser deposition on MgO and Si substrates. The magnetic and electrical properties of these epitaxial films are close to those of single crystals. For 40-50 nm thick films, the saturation magnetization and electrical conductivity are ∼450emu∕cm3 and 225Ω−1cm−1…
Artificial superlattices of SrZrO3(SZO)∕SrTiO3(STO) were fabricated by molecular-beam epitaxy. Lattice parameters showed that the lattice distortion (c∕a ratio) attained a maximum value in the [(SZO)10∕(STO)10]4 superlattice. Dielectric relaxation was observed in the [(SZO)1∕(STO)1]40 and [(SZO)10∕(STO)10]4 superlatti…
In the present study, we report the hydrogen content estimation of the hydrogenated amorphous carbon (a-C:H) films using visible Raman spectroscopy in a fast and nondestructive way. Hydrogenated diamondlike carbon films were deposited by the plasma enhanced chemical vapor deposition, plasma beam source, and integrated…
To estimate the apex field enhancement factor associated with carbon nanotube on a planar cathode surface, the simple model of floated sphere between parallel anode and cathode plates was studied. When the anode-cathode distance d is much larger than the height h of carbon nanotube, the field enhancement factor of car…
In this paper, we illustrate an approach to discriminate between epitaxial strain and other factors responsible for the decrease of the metal–insulator transition temperature (TP) in thin La0.7Sr0.3MnO3 films grown by pulsed laser deposition. Using this approach, we have estimated the effect of the biaxial strain on T…
Sm 2 ( Co , Cu , Fe , Zr ) 17 permanent magnets with their three-phase precipitation structure (cells, cell walls, and lamellae) show two characteristic features which so far are difficult to interpret but which are the prerequisites for high-temperature applications: (1) The hard magnetic properties only develop duri…
The phenomenon of polarization imprint consisting of the development of a preferential polarization state in ferroelectric films is known as one of the major issues impacting the development of high density ferroelectric memories. According to the commonly accepted scenario, the imprint is related to the charge inject…
The conductivity of $α$-polyvinylidene fluoride ($α$-PVDF) is obtained from dielectric measurements performed in the frequency domain at several temperatures. At temperatures above the glass-transition, the conductivity can be interpreted as an ionic conductivity, which confirms earlier results reported in the literat…
The presence and release of nanoparticles into the environment has important implications for human health and the environment. This article highlights and describes techniques that are effective in the characterization of anthropogenic and naturally occurring nanoparticles. Particle attributes like size, size distrib…
The condensation energy of the homogeneous electron gas is calculated within the density functional theory for superconductors. Purely electronic considerations include the exchange energy exactly and the correlation energy on a level of the random phase approximation. The singlet superconductivity is assumed, and the…
Abstract Blends of polypropylene (PP) and thermoplastic elastomers (TPE), namely SBS (styrene‐butadiene‐styrene) and SEBS (styrene‐ethylene/1‐butene‐styrene) block copolymers, were prepared to evaluate the effectiveness of the TPE type as an impact modifier for PP and influence of the concentration of elastomer on the…
An infrared study of the phonon spectra of ZrW2O8 as a function of temperature which includes the low-energy (2-10 meV) region relevant to negative thermal expansion is reported and discussed in the context of specific heat and neutron density of state results. The prevalence of infrared active phonons at low energy a…
The electronic breakdown and the bias dependence of the conductance have been investigated for a large number of catalytic chemical vapor deposition grown single-walled carbon nanotubes (SWCNTs) with very small diameters. The convenient fabrication of thousands of properly contacted SWCNTs was possible by growth on el…
Artificial superlattices designed with a ferromagnetic Pr0.85Ca0.15MnO3 insulating layer and ferroelectric Ba0.6Sr0.4TiO3 layer were grown on (100) SrTiO3 substrates. The magnetotransport properties were measured with the current perpendicular to the plane geometry. An increase in magnetoresistance (MR), with no signi…
This paper presents findings from a study of nanocrystalline diamond (NCD) growth in a microwave plasma chemical vapor deposition reactor. NCD films were grown using Ar∕H2∕CH4 and He∕H2∕CH4 gas compositions. The resulting films were characterized using Raman spectroscopy, scanning electron microscopy, and atomic force…
We show that magnetization damping in Permalloy, Ni80Fe20, can be enhanced sufficiently to reduce postswitching magnetization precession to an acceptable level by alloying with the transition metal Os (osmium). The damping increases monotonically upon raising the Os concentration in Permalloy, at least up to 9% of Os.…