Materials Literature
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Architecture in minature: Fréchet-type monodendrons functionalized on their periphery with the 3,4-bis(n-dodecan-1-yloxy)benzyl ether minidendron exhibit flat tapered (at generations two (G2) and three (G3)), disclike (G4), and conical (G5) shapes that self-assemble into cylindrical (G2–4) and spherical (G5) supramole…
Complicated, alternating ferromagnetic/antiferromagnetic interactions in homometallic, one-dimensional MnII-azido systems permit an unprecedented ferrimagnetic response. One new kind of ferrimagnet with a surprising ferrimagnetic behavior in a system with ground state ST = 0 (see picture) was observed and related to t…
The partitioning of Zn to the pyrophyllite surface was studied as a function of surface loading for periods up to 4 months. Examination of the reaction products using X-ray absorption fine structure spectroscopy (XAFS) indicated the formation of a Zn precipitate at each surface loading. Comparison of the local structu…
The world record in ground state spin value “S = 51/2” belongs to a ferromagnetically coupled, cyano-bridged pentadecanuclear Mn cluster (see picture). This molecule has 51 unpaired electrons. Magnetic dipole–dipole interactions together with exchange interactions resulting from the specific three dimensional crystal…
Recent high pressure work has suggested that elemental barium forms a high pressure self-hosting structure (Ba IV) involving two `types' of barium atom. Uniquely among reported elemental structures it cannot be described by a single crystalline lattice, instead involving two interpenetrating incommensurate lattices. I…
We examine the response of a soft ferromagnetic film to an in-plane applied magnetic field. Our theory, based on asymptotic analysis of the micromagnetic energy in the thin-film limit, proceeds in two steps: first we determine the magnetic charge density by solving a convex variational problem; then we construct an as…
We perform experiments on thin-film diaphragms to show that the folding patterns of anisotropically compressed diaphragms are strikingly different from those of isotropically compressed ones. We then use a simple von Karman model to relate the overall features of these folding patterns to the underlying energetics. We…
A method is developed which allows to determine the first-order and the second-order magnetoelastic coefficients of a magnetic bulk material from the ab-initio calculation of the magnetocrystalline anisotropy energy as function of a prestrain. Excplicit results are given for bcc Fe, and they agree well with experiment…
A numerical investigation of grain-boundary (GB) grooving by means of the Level Set (LS) method is carried out. GB grooving is emerging as a key element of electromigration drift in polycrystalline microelectronic interconnects, as evidenced by a number of recent studies. The purpose of the present study is to provide…
A chemical view of spin magnetic phenomena in finite (atoms and molecules) and infinite (transition metals and their alloys) systems using the concepts of bonding and electronic shielding is presented. The concept is intended to serve as a semiquantitative signpost for the synthesis of new ferromagnets. After a concis…
The effect is treated of the space charge field and of the crystallite size on the properties of ferroceramics of different compositions. The established qualitative correlation between the structure and electrophysical parameters, the crystallite size, and the space charge field may be useful in designing ferropiezoc…
We present electro-optical experiments in ferroelectric freely suspended smectic films using reflective polarizing microscopy. The observation of travelling 180° walls (kinks) in the film plane is described. The c-director alignment at the lateral film boundaries initiates the kink formation when the polarity of an ex…
It has been found that the formation of a ferroelectric phase for the SrBi 2 Ta 2 O 9 (SBT) thin films derived from sol–gel solution is dependent on the oxygen pressure during the heat-treatment process. Under an elevated oxygen pressure as high as 30 atm, the heat-treatment temperature inducing the ferroelectric SBT…
Effects of a DC field on the real part of the relative dielectric constant of Al 2 O 3 -doped barium strontium titanate for application in phased array antennas have been studied. The real part of the relative dielectric constant of the specimens decreases when the applied DC field is increased. The tunability is abou…
The ultrasonic velocity, viscosity, refractive index and density of polycarbonate/poly-(methyl methacrylate) (PC/PMMA) and polycarbonate/polystyrene (PC/PS) blends in solution have been measured at 30°C. Using the viscosity data, the interaction parameters have been computed which indicate that the PC/PMMA blend is mi…
Poly(3-methylthiophene) (P3MT) films were electrogenerated on both platinum and carbon-felt working electrodes. The kinetic equation was determined by the monomer and electrolyte concentrations being changed for different reaction times. For each sample, the weight of the polymer obtained was measured along with the p…
A new type of cyanide-bridged bimetallic assemblies, [Ni(chxn)2]3[M(CN)6]2·2H2O (chxn = 1,2-trans-cyclohexanediamine; M3+ = Fe (1), Co (2)), have been prepared. The X-ray crystallography for the assemblies has proved a 2-D network comprised of M6Ni6 dodecagon units extended by M-CN-Ni linkage. Compound 1 shows a ferro…
Well-aligned pseudosingle crystals of a series of Terfenol-D and Al-substituted alloys have been prepared using the Czochralski method, a route that has the advantage that a grain-aligned rod can be prepared in one relatively speedy operation. The effects of several factors, including pulling rate, heat treatment, and…
Ternary thallinm lanthanide dichalcogenides TILnX2 (X = S, Se, or Te; Ln = lanthanide, except Ce and Pr) crystallize in the rhombohedral structure of -NaFeO 2 type (R3m). Their crystal lattice consists of the layers of Ln3 + ions separated by three layers of the non-magnetic ions (-Ln-X-Tl-X-Ln-). The magnetization wa…
The feasibility and a review of progress in the long-wavelengths anomalous dispersion technique is given in the context of the development of beamline ID1 of the ESRF for such studies. First experiments on this beamline and their analyses are described. The first study reports on the use of uranium which exhibits an u…