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。
In this article, we motivate the detailed comparison of the physical properties of individual configurations of a ferroelectric solid solution as a means toward developing first principles models for these systems. We compare energies, dielectric constants epsilon_infinity, mode effective charges of local polar distor…
We study the effect of long-range elastic interactions in the dynamical behavior of an elastic chain driven quasi-statically in a quenched random pinning potential and in the strong pinning limit. This is a generic situation occuring in solid friction, crack propagation, wetting front motion, ... Tuning the exponent o…
The hydrogenation disproportionation desorption recombination (HDDR) process was applied to produce isotropic, submicron powder in 500 g batches in a specially designed HDDR reactor. The hot pressing characteristics of the material were determined and it was shown that the material has an excellent stability against g…
The temperature and frequency dependences of the permittivity , the dielectric loss factor and the resistance R of the ceramic Ti in the interval 100-800 C were studied. A ferroelectric phase transition at temperature C was observed. Hysteresis loops typical for ceramic ferroelectrics were observed. Relaxation maxima…
Electrical transport in polycrystalline ceramics of K-type has been investigated as a function of temperature using complex-plane impedance analyses, dielectric properties, DC conductivities by the four-probe method, thermoelectric power and magnetic susceptibilities. The bulk conductivities were obtained using the co…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Palladium(II)-Catalyzed Asymmetric Chlorohydrin SynthesisArab El-Qisairi, Othman Hamed, and Patrick M. HenryView Author Information Department of Chemistry, Loyola University of Chicago, Chicago, Illinois 60626 Cite this: J. Org. Chem. 1998, 63, 9, 2790–2791Publi…
Measurements of the order-parameter critical exponent $\ensuremath{\beta}$ at the uniaxial-biaxial nematic phase transition in a lyotropic mixture are reported. They reveal a strong dependence of $\ensuremath{\beta}$ on the concentration of the mixture compounds with two distinct intervals of values separated by a dis…
The ability to modify the stacking sequence of ultrathin films offers a unique way to change either the interaction strength or the doping, but demands a careful control of each atomic monolayer. Progress is hampered by the lack of a direct method that allows differentiation on a local scale between the various termin…
Electrical properties of the interface between Bi4Ti3O12 ferroelectric film and p-Si substrate have been studied by capacitance–voltage (C–V) characteristics. It is found that the interface barrier can be broken down temporally because of the charge injection from Si substrate into the ferroelectric thin film, and thi…
A two-dimensional ferromagnetic Ising system composed of ferrimagnetically ordered chains with alternating spin- and spin- S atoms is investigated by the use of Ising spin identities and the differential operator technique, in order to clarify the magnetic properties of bimetallic molecular-based magnetic materials. T…
Weak uniaxial stress (< 1 kPa) along the cubic [100] and [110] directions of modifies significantly the domain structure near the crystal surface on cooling to the tetragonal phase. High-resolution x-ray rocking curves show that oriented slabs have a preference of ` c ' domains perpendicular to a small (001) surface.…
Electrooptic spectroscopy of an antiferroelectric liquid crystal is carried out over a range of frequencies from 1 Hz to 100 kHz. In the antiferroelectric SmCA phase two relaxation processes are found, one at the fundamental frequency of a mode and the second at twice the frequency of a different mode. A comparison of…
In a previous paper it was shown that in-crystal ion polarizabilities derived from low-frequency precision measurements of the dielectric constants of single-crystal oxides can be given a quantitative interpretation using a quantum mechanically based result for a single, completely filled, electron subshell. In this p…
The compressibility of wurtzitic boron nitride (wBN) taken in mixture with cubic BN has been measured at room temperature up to 66 GPa, using a diamond anvil cell and powder diffraction of synchrotron radiation. From the obtained pressure-volume relation for wBN the isothermal bulk modulus of B0=375±9 GPa and its firs…
We report the results of magnetization measurements on pseudomorphic (fully strained) c-axis oriented colossal magnetoresistance manganite thin films grown by molecular beam epitaxy. We observe uniaxial magnetic anisotropy (hard axis/easy plane) with the easy plane being the film plane. Within the plane a weaker biaxi…
A method for the calculation of the temperature dependence of dielectric and piezoelectric responses, based on the use of a first-principles effective Hamiltonian, is described. Results are presented for the ferroelectric perovskite PbTiO3. While the method includes only the soft-mode contributions to the responses, i…
A method of controlling threading dislocation densities in Ge on Si involving graded SiGe layers and chemical-mechanical polishing (CMP) is presented. This method has allowed us to grow a relaxed graded buffer to 100% Ge without the increase in threading dislocation density normally observed in thick graded structures…
We described genetically engineered syntheses of tandem repetitive polypeptides consisting of glycine-rich sequence, GlyLeuGlyGlyGlnGlyGlyGlyAlaGlyGlnGlyGlyTyrGly, designated SCAP(1), in spidroin 1 of spider dragline silk from Nephila clavipes and the secondary conformational analyses in the solid state by Fourier tra…
A variety of approximate methods for efficient modeling of large lanthanide (Ln) complexes were studied. Attention was paid to ligand motifs prevalent in Ln coordination chemistry. Gadolinium was chosen given its central location in the Ln series and its importance in areas such as magnetic resonance imaging. A semiem…
Continuing with the evaluation of costabilizers along with preheated metal stearates to stabilize poly(vinyl chloride) (PVC), pentaerythritol was chosen as a long-term costabilizer. During normal stabilization conditions, the polyol enhances the induction time to degradation but produces large amounts of polyenes. The…