Materials Literature
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Z‐type hexaferrite with the composition Ba 3 Co 1.4 Cu 0.6 Fe 24 O 41 was studied as a candidate material for low‐temperature cofiring technology. The samples were prepared by solid‐state reaction at 1250°C and sintered and cosintered with Ag at 900°C. Bi 2 O 3 was used as a sintering additive, which was necessary for…
A transcription error in equation (5), containing the procedure to compute the classical turning points, was detected. Please see the PDF for the corrected equation.
Abstract The crystal structures for cis‐ (Ph 2 PCH=CHPPh 2 )(AuI) 2 and trans‐ (Ph 2 PCH=CHPPh 2 )(AuI) 2 are reported. The structure of cis‐ (Ph 2 PCH=CHPPh 2 )(AuI) 2 reveals a short intramolecular Au–Au distance of 2.9526(5) Å, while the structure of trans ‐(Ph 2 PCH=CHPPh 2 )(AuI) 2 shows intermolecular Au–Au dist…
Hexagonal ferrites represent an extensive family of mixed-layer magnetic materials with periods up to 1500 A along the stacking direction, probably constituting the largest unit cells in the inorganic realm. The (TS)(n)T subfamily includes P3m1 and R3m structures that can be derived from Y ferrite Ba(2)M(2)Fe(12)O(22)…
Abstract The supercritical CO 2 (sc‐CO 2 ) provided a moderate condition to make the amorphous CO 2 /poly(ether ether ketone) (PEEK) mixtures at 30 MPa and 40 °C. The crystal is obtained directly after treating CO 2 /PEEK mixture from 70 to 240 °C. The crystallization behavior of CO 2 /PEEK mixtures before and after t…
During recrystallization, dislocation-poor grains grow and invade the heavily deformed dislocation-rich matrix. In this work, we develop a coupled dislocation density and phase-field method to model the isothermal recrystallization process as a phase transformation, driven by the stored elastic energy. Dislocations ar…
The surface modification of cellulose fibers with 3,3,3-trifluoropropanoyl chloride (TFP) was studied in a toluene suspension. The characterization of the modified fibers was performed by elemental analysis, Fourier transform infrared (FTIR), 13C-solid-state NMR, X-ray diffraction, thermogravimetry, and surface analys…
Low-energy transport measurements in quantum Hall systems have been argued to be governed by emergent modular symmetries whose predictions are robust against many of the detailed microscopic dynamics. We propose the recently observed quantum Hall effect in graphene as a test of these ideas, and identify to this end a…
We report the combination of top-down and bottom-up nanomanufacturing techniques to fabricate active, hierarchically structured volume reflection gratings. Holographic polymerization (H-P) formed lamellar structures of approximately 200 nm in thickness, confining a block copolymer (BCP) to approximately 100 nm domains…
Arrays of transparent dielectric nanorods are shown to produce very large local field enhancements at specific resonant conditions. These structures would lead to enhancement of molecular fluorescence signals without quenching. The resonant angular width and field enhancements are analytically derived as a function of…
We consider three-dimensional structures consisting of multiple interlocking, disconnected metal networks. We show that, in the low-frequency limit, these systems support photonic bands with linear dispersion relation. The number of such photonic bands is directly controlled by the number of networks and can be arbitr…
A new Brownian dynamics model is presented to describe the coarse grain dynamics of particles with long-lived memory. Instead of solving a set of generalized Langevin equations we introduce a set of variables describing the slowly fluctuating thermodynamic state of the ignored degrees of freedom. These variables give…
Abstract A new heterocyclic system, namely [1,2,5]selenadiazolo[3,4‐ c ][1,2,5]thiadiazole ( 1 ), has been prepared in 60 % yield by the 1:1 condensation of 3,4‐diamino‐1,2,5‐thiadiazole ( 4 ) with SeCl 4 in the presence of pyridine. The structures of 1 and its 1:1 complex with pyridinium chloride ( 5 ) have been eluc…
Single-phased powder BiCrO(3) sample was prepared at 6 GPa and 1653 K. Its magnetic properties were investigated by dc/ac magnetization, magnetic relaxation, and specific heat measurements. Four anomalies of magnetic origin were found near 40, 75, 109, and 111 K. The long-range antiferromagnetic order with weak ferrom…
Abstract Polyimide/diamond nanocomposites have been synthesized from 4,4′‐diaminodiphenyl ether (ODA) and 3,3′,4,4′‐benzophenonetetracarboxylic dianhydride (BTDA). All the polyimides show non‐crystalline X‐ray diffraction. The frequent occurrence of particular interatomic distances ( R ) denoted by the non‐crystalline…
Luminescence from single isoelectronic traps in nitrogen δ-doped gallium phosphide was studied by micro-photoluminescence spectroscopy. These single traps were found to emit photons that were nearly identical in both emission energy and brightness. Furthermore, single photon emission from a single nitrogen pair is con…
Abstract The photo‐ and thermochromic behaviour of a series of spiro[indolinepyridobenzopyrans] 1–5 has been studied. The thermodynamic and kinetic parameters of the thermal equilibria between the ring‐closed and ring‐opened (merocyanine) isomeric forms of spiropyrans have been determined using UV–Vis absorption and 1…
Size dependent stabilities, fragmentation pathways and dissociation energies of a series of gas phase cationic doped gold clusters, Au(n)X+ (3 < or = n < or = 20; X = Y, Er and Nb), and pure Au(n)+ clusters were investigated in photofragmentation experiments. Size dependent stability patterns were obtained and the bra…
The authors report the transmission properties of omega shaped metallic inclusions on a dielectric medium that exhibits bianisotropic properties. The resonance frequencies of single omega resonators are investigated experimentally and numerically. The resonance frequency of an Ω structure depends on its orientation wi…
Platinum nanocrystals of about 30−100 nm size were grown on SrTiO 3 substrates in different orientations. Their shapes were investigated using first-principles methods and compared to scanning electron microscope images. Analysis of the results for several different surface orientations shows epitaxial growths, unifor…