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。
Abstract The influence of surface roughness on total as well as angle‐dependent signal electron intensities has been studied by means of an effective and simple theoretical model. It was found that the influence of surface roughness may be accounted for in the usual formalism for AES/XPS by using an effective depth di…
Effects of substrate pre-treatment and O 2 partial pressure on the epitaxial growth of sputter-deposited BaTiO 3 films on (100)MgO have been studied. When the film thickness is 20 nm, significant differences in the surface crystallinity and morphology of the films are produced by HCl etching of the substrate surface.…
Filling of the pore network of porous silicon layers with Ge and Si has been demonstrated using a chemical vapor deposition (CVD) technique. It is shown that at low growth rate the species are deposited throughout the whole layer which can be completely filled. At high growth rate, the deposition takes place mainly on…
There are many examples in macromolecular crystallography where interest focuses on the differences between a previously determined 'native' structure and a nearly isomorphous 'variant'. In such cases, a useful approach to atomic refinement of the variant structure is through weighted least-squares minimization of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of diaryl sapphyrins prepared under Lindsey-type conditionsJonathan L. Sessler, Jerzy Lisowski, Kevin A. Boudreaux, Vincent Lynch, John Barry, and Thomas J. KodadekCite this: J. Org. Chem. 1995, 60, 18, 5975–5978Publication Date (Print):Septemb…
Metal-semiconductor field-effect transistors (MESFETs) have been fabricated using the p-type surface-conductive layer of undoped homoepitaxial diamond film on the surface. The layers have been employed as the channel of MESFETs. Since the surface-conductive layer is ultrathin, the depletion region has already closed t…
Abstract Solid state C-13 NMR has been used to compare the chemistry of accelerated vulcanization of natural rubber using N- t -butyl-2-benzothiazole sulfenamide in the presence and absence of carbon black. The carbon black filler has an influence on the vulcanization chemistry in addition to its accepted role in rein…
The scattering from crystals has two components, Bragg and diffuse. In the case of disordered crystalline materials, or those at high temperature, the latter contribution is considerable and contains a great deal of information about any static or thermal disorder in the system. However, interpretation of this diffuse…
Most electrooptic effects in liquid crystals require a uniform orientation of the director at the glass substrates. A new method to produce suitable alignment layers is based on the creation of anisotropic polymer films by photopolymerization with linearly polarized light. In the present paper we report on measurement…
The formation mechanism of the “grain core-grain shell” structure was investigated for the BaTiO 3 -Nb 2 O 5 -Co 3 O 4 ternary system with two different Nb/Co ratios, in terms of sintering characteristics. The temperature dependence of the dielectric constant, the densification behavior and the grain growth rate were…
Structural free volumes in the stable quasicrystalline decagonal and adjacent crystalline phases in the Al-Ni-Co, Al-Cu-Co, and Al-Ni-Fe alloy systems were studied by means of positron lifetime measurements. The comparison of different phases and different alloy systems enables an unambiguous assessment of the positro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmphidinolides O and P, novel 15-membered macrolides from the dinoflagellate Amphidinium sp.: Analysis of the relative stereochemistry and stable solution conformationMasami Ishibashi, Miho Takahashi, and Jun'ichi KobayashiCite this: J. Org. Chem. 1995, 60, 19, 6062–6066Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharge-Carrier Evolution in Electrically Conducting Substituted Polymers Containing Biheterocycle/p-Phenylene Repeat UnitsAndrew D. Child, Balasubramanian Sankaran, Fernando Larmat, and John R. ReynoldsCite this: Macromolecules 1995, 28, 19, 6571–6578Publication Date (Print)…
Trivalent europium‐activated yttrium oxysulfide phosphor material prepared by a sulfide fusion method is the primary red material used extensively in color television (CTV) screens. Applying the heterogeneous nucleation theory, we discuss some new results obtained on the formation process of the yttrium oxysulfide sys…
Abstract EuCu 2 As 2 (a = 4,215(1) Å, c = 10,185(2) Å) und EuCu 2 Sb 2 (a = 4,504(1) Å, c = 10,824(2) Å) wurden durch Erhitzen entsprechender Gemenge aus CuCl und Arsen bzw. Antimon mit Europium auf ca. 900°C dargestellt und mit verd. Essigsäure von den Nebenprodukten befreit. Das Arsenid kristallisiert im ThCr 2 Si 2…
Electrochromic manganese oxide thin films were prepared by chemical vapor deposition. The source material was manganese (III) acetylacetonate. Transparent thin films were obtained at a substrate temperature above 250°C. Oxidation and reduction of the films in a propylene carbonate solution resulted in desirable change…
Abstract The crosslinking of ferroelectric liquid‐crystalline (LC) polysiloxanes — performed within the region of microphase separation — allows the preparation of LC‐elastomers which combine macroscopic form stability (insolubility) with nearly unchanged switching time (compared to the uncrosslinked polymers).
The operation of optical narrowband reflection filters based on resonance anomalies of waveguide gratings is well established for gratings of infinite extent. We investigate the properties of finite-aperture waveguide-grating resonance filters by means of rigorous electromagnetic theory and an approximate model. The r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory for the Phase Behavior of Polyolefin Blends: Application to the Polyethylene/Isotactic Polypropylene BlendJohn J. Rajasekaran, John G. Curro, and J. D. HoneycuttCite this: Macromolecules 1995, 28, 20, 6843–6853Publication Date (Print):September 1, 1995Publication Hist…
Ceramic specimens of the complex perovskite oxide Ba(Fe 1/2 Nb 1/2 )O 3 were fabricated by conventional solid state sintering. Dielectric constants were measured as a function of temperature as well as of frequency. As a result, dielectric constants showed an unusual temperature dependence. Moreover, a large dielectri…