Materials Literature
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A series of silicon carbide‐based ceramics with different sintering additives were liquid‐phase sintered to high densities. Yb 2 O 3 in combination with AlN was used as the additive, instead of the commonly used Y 2 O 3 –AlN, to improve the refractoriness of the secondary phase. Thermo‐chemical decomposition of AlN wa…
In this paper, lead hafnate titanate (PHT) was derived by chemical solution deposition (CSD) and characterized as a thin film material. The thin films were tested for the usage as a ferroelectric thin film in view of Ferroelectric Random Access Memory (FRAM) devices and compared with an equivalent lead zirconate titan…
The mechanical and thermal stability of Y-shaped rings made solely of carbon nanotubes is investigated by using a numerical Monte Carlo simulation based on the Tersoff interatomic potential. The addressed structures resemble two joined Y junctions presenting topological defects and form quite interesting ring structur…
Hot‐pressed 3 mol% Y 2 O 3 partially stabilized ZrO 2 was reacted with titanium at 1550°C/30 min. The interface was characterized by analytical transmission microscopy (transmission electron microscopy/energy‐dispersive spectroscopy). The lamellar and the spherical Ti 2 ZrO as well as the orthorhombic β′‐Ti were found…
We show that the photoluminescence emitted from a dense, two-component quantum dot ensemble on a thin film is significantly higher and decays much faster than that from quantum dots of either of the two pure systems (CdS and ZnO). The semiconductor nanocomposite, in which the characteristic grain size of each species…
Effects of the sintering additives CeO 2 and K 2 O on eliminating interphases of cristobalite and spinel were studied by means of XRD, SEM/energy‐dispersive spectrometer, and TMA techniques to obtain high cordierite contents. Adding 4 wt% CeO 2 significantly stimulates the conversion of cristobalite to cordierite, dep…
The concentration of reactive metal hydride (Met-H) reducing agents can be determined (in < or = 20 min) using No-D NMR spectroscopy. The method involves (i) reacting Met-H with an excess of p-methoxybenzaldehyde, (ii) quenching with excess acetic acid, (iii) recording the No-D NMR spectrum of this homogeneous mixture…
We report an experimental and theoretical study of the strong dependence of the crystalline texture of thin films of ${\mathrm{Sr}}_{x}{\mathrm{Ba}}_{1\ensuremath{-}x}{\mathrm{Nb}}_{2}{\mathrm{O}}_{6}$ grown on MgO(001) on the Sr-content $x$ between $0.35\ensuremath{\leqslant}x\ensuremath{\leqslant}0.75$. Synchrotron-…
Using a recently developed $N\text{th}$-order muffin-tin-orbital-based downfolding technique in combination with the dynamical mean-field theory, we investigate the electronic properties of the much-discussed Mott insulator TiOCl in the undimerized phase. Inclusion of correlation effects through this approach provides…
Mechanical alloying (MA) synthesis of Ti 3 SiC 2 from a stoichiometric elemental powder mixture of Ti, Si, and C was conducted by using a planetary mill with a specially designed MA jar, which enables the real‐time measurement of temperature and gas pressure during the MA process. Sudden gas pressure and temperature r…
Abstract An instrument of controlled rate evolved gas analysis (CREGA) coupled with TG‐DTA was constructed for analyzing the influences of product gases on the kinetics and mechanism of the thermal decomposition of solids that produce more than one gaseous products at the same stage of reaction. The thermal decomposit…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPreparation of High Barrier and Exfoliated-Type Nylon-6/Ultrafine Full-Vulcanized Powdered Rubber/Clay NanocompositesWeifu Dong, Yiqun Liu, Xiaohong Zhang, Jianming Gao, Fan Huang, Zhihai Song, Tan, and Jinliang QiaoView Author Info…
As in fiber‐reinforced composites, debonding, which allows the elongated reinforcing grains to at least partially separate from the rest of the matrix, is a critical part of the toughening mechanism in self‐reinforced silicon nitrides. In situ high‐resolution electron microscopy observations reveal that the debonding…
We present a spray based-method for the formation and production of semiconductor nanocrystals that provides an attractive alternative to the commonly used epitaxial and colloidal procedures. According to this spray-based method, mainly thermospray, solutions of semiconductor salts are first sprayed into monodispersed…
Based on the efficient combination of calixarene spacers and acetylenic porphyrin derivatives, a new generation of cofacial bis-porphyrins has been synthesized. The first crystal structure of a cofacial bis-porphyrin-calixarene conjugate is reported. Their unique architectural features, analogous to those of pac-man-t…
It is shown that a $4d$ metal (palladium) orders ferromagnetically in GaN, forming a dilute magnetic semiconductor. The ferromagnetic ordering occurs despite Pd being nonmagnetic in its natural phase. ${\mathrm{Pd}}_{0.0625}{\mathrm{Ga}}_{0.9375}\mathrm{N}$ is shown to possess a magnetic moment of $1.3\phantom{\rule{0…
We report a method that allows direct, systematic, and accurate determination of the atomic structure of multiwalled carbon nanotubes by analyzing the scattering intensities on the nonequatorial layer lines in the electron diffraction pattern. Complete structure determination of a quadruple-walled carbon nanotube is d…
The surface charge of semiconductor nanoparticles, Q, is an important parameter which determines their electrokinetic behavior, stability in water and polar solvents, functions of optical and electronic devices, self-assembly properties, and interactions with cell membranes. We have developed a simple method for quant…
In this article, we investigate a series of alpha,omega-dicyano end-capped oligothiophenes NC(C(4)H(2)S)(n)()CN ranging in length from the dimer to the hexamer (n = 2-6), in the neutral state as pure solids, by means of Fourier transform IR and Fourier transform Raman (FT-Raman) spectroscopies. The cyclic voltammetry…
A rapid-compression apparatus with a large pressure jump is described. The pressure jump was performed principally by using a large volume bladder-type power accumulator that contains compressed nitrogen and the connected electromagnetic valves. Maximum force induced by the press is 1.1 MN. Within 20 ms the pressure o…