Materials Literature
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A new chain ferroelectric random access memory-a chain FRAM-has been proposed. A memory cell consists of parallel connection of one transistor and one ferroelectric capacitor, and one memory cell block consists of plural memory cells connected in series and a block selecting transistor. This configuration realizes the…
Monodisperse, spherical organo‐silica powders were synthesized from an immiscible mixture of an aqueous NH 4 OH solution and organo‐alkoxysilanes, such as phenyl‐trimethoxysilane (PTMS), methyltrimethoxysilane (MTMS), and methyltriethoxysilane (MTES). When the organo‐alkoxysilanes were added to the aqueous NH 4 OH sol…
We report Monte Carlo results for the two-dimensional hard-disk system. Simulations were performed in the NVT ensemble with up to 65 536 disks, using a new updating scheme. We analyze the bond orientational order parameter and correlation length in the isotropic phase and the scaling behaviour of the bond orientationa…
We report the systematic comparison of the optical emission intensity of the vibrational band of the Swan system with the absolute concentration in and microwave plasmas used in the deposition of nanocrystalline diamond. The absolute concentration is obtained using white-light absorption spectroscopy. Emission intensi…
One explanation of the Hall-Petch relationship is that dislocation pile-ups serve to enhance the stress felt at grain boundaries. This dislocation pile-up model results in a d −½ dependence of the yield strength, with d the grain size. In fact, this dependence is observed often. However, the traditional pile-up pictur…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTLigand Design Approach for Securing Robust Oxidation CatalystsColin P. Horwitz, David R. Fooksman, Leonard D. Vuocolo, Scott W. Gordon-Wylie, Nathaniel J. Cox, and Terrence J. CollinsView Author Information Department of Chemistry, Carnegie Mellon University 4400 Fifth…
This article gives an overview of fabrication and performance of a class of vacuum microelectronic devices, namely, silicon tip-on-post field emitter arrays (FEAs). Experimental data illustrating the device performance are presented in the context of requirements for field emission flat panel display and microwave pow…
Granular flow of comminuted ceramics governs the resistance for penetration of ceramic armor under impact. To understand the mechanism of the granular flow, silicon carbide was subjected to high-strain, high-strain-rate deformation by radial symmetric collapse of a thick-walled cylinder by explosive. The deformation,…
We present results of a study of possible magnetic ordering in the icosahedral phase of Tb-Mg-Zn probed by bulk magnetization measurements and neutron diffraction. Measurements on both crushed single grains and cast polycrystalline samples of Tb-Mg-Zn were performed. Magnetization measurements on both samples reveal o…
We investigate the magnitude of density jumps across phase transitions in soft-matter systems composed of macromolecular particles, like star polymers or colloidal suspensions. The standard route to predict phase transformations is to start from an effective interaction potential between these macroparticles and map t…
We report on detailed Hall-effect measurements of thin films of ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ above and below the metal-insulator transition. In the metallic ferromagnetic regime, we find a temperature-independent holelike nominal charge-carrier density ${n}_{h}^{*}=1.3$ per unit cell, c…
To satisfy the electrical and thermomechanical requirements for a continuous wave millimeter wave beam transmission, a window assembly using a large size synthesized diamond disk has been developed. Such window systems are needed as a vacuum barrier and tritium shielding in future electron cyclotron heating systems fo…
A metalloporphyrin has been synthesized carrying a beta-cyclodextrin group on tetrafluorophenyl rings at the four meso positions of the porphyrin. It performs the selective hydroxylation of an androstanediol derivative with complete positional selectivity and 187 turnovers.
Catalytic activity tests in combination with characterization studies (using CO temperature programmed reduction, electron paramagnetic resonance, and Fourier transform infrared) have been performed with the aim of establishing which are the main factors influencing the reactivity of an oxidized Pt/CeO 2 /Al 2 O 3 cat…
The crack healing and strength behavior of an alumina‐silicon carbide (Al 2 O 3 ‐SiC) nanocomposite (Al 2 O 3 + 5 vol% 0.2 μm SiC particles) has been studied, as a function of the crack size and the annealing environment. Results show that annealing treatments can significantly increase the indentation strength. The a…
Abstract Model identification and control were studied for the seeded batch crystallization of an organic, industrial photochemical. The growth and nucleation kinetics are described by empirical power‐law expressions in relative supersaturation, and an additional model describing crystal shape dynamics is proposed. Th…
The phonon density of states of aluminum nitride was determined by time-of-flight neutron spectroscopy using a polycrystalline sample. The observed phonon excitation spectrum consists of a broadband centered at about 35 meV, a small gap in the 75--80 meV region, and two sharp bands at approximately 85 and 92 meV. A ri…
Photovoltaic effects in CdSe quantum dot (QD) films have been studied using surface photovoltage spectroscopy and complementary methods. The results show that, contrary to previous studies, nonnegligible electric fields can exist in QD films. As a result, driftlike currents must be considered, in addition to the well‐…
The electrosynthesis of tetrathiafulvane-derivatized polythiophenes (PT-TTFs) from bithiophenic precursors such as that shown in the Figure (m = 3 or 5) is reported. The lower oxidation potential of bithiophene compared to thiophene is suggested to account for the ease of electropolymerization. Highly electroactive, s…
The mechanical properties of Si 3 N 4 /SiC nanocomposite materials that contained nanosized intercrystalline SiC dispersions that originated from different starting powders and were made via different fabrication routes were studied in the temperature range of 1400°‐1550°C. The strength retained at 1400°C was between…