Materials Literature
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A Comment on the Letter by Y.-K. Kwon, S. Berber, and D. Tomanek, Phys. Rev. Lett. 92, 015901 (2004)PRLTAO0031-900710.1103/PhysRevLett.92.015901. The authors of the Letter offer a Reply. © 2005 The American Physical Society.
Superlattices built from two antiferromagnetic (AFM), charge- and/or orbital-order compounds, ${\mathrm{Pr}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3}$ and ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3}$, were studied as the thickness of ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{…
A procedure is described in which kaolin and NaHSO 4 are heated in a furnace at temperatures between 200 and 1000 °C. Parameters studied were the reaction temperature and time, proton to alumina molar ratio, calcination temperature and time, and reaction atmosphere. The Al reaction yield grew until reaching a maximum…
Abstract The problem of macromolecular nucleation and crystallization on porous silicon surface is investigated theoretically. The fractality of the porous silicon layer is exploited. It is shown that the effective surface density of adsorbed particles on a fractal self‐similar surface significantly exceeds that on a…
The anisotropic fracture behavior in unpoled and poled (1− x )Pb(Zn 2/3 Nb 1/3 )− x PbTiO 3 ( x =0.045) (PZN–4.5%PT) single‐crystal relaxor ferroelectrics cut along the crystal planes, [010] and [001], was characterized. The crack tip toughness ( K tip ) determined from Vickers indentations was compared with the R ‐cu…
Alumina preforms containing artificial pores were sintered at 1630°C in air and vacuum. Glass penetration into the alumina preforms was conducted at 1600°C in air. It was found that the trapped gases in alumina preforms sintered in air caused the random and incomplete filling of the smaller and larger artificial pores…
A solid oxide fuel cell (SOFC) structure is proposed in which a composite thin film cathode substrate supports a dense thin film electrolyte with a thickness of less than 1 μm. The cathode substrate has a graded porosity achieved through the partial sintering of a spin‐coated CeO 2 colloidal suspension. The resulting…
Spark plasma sintering (SPS) is one of the advanced consolidation techniques developed in the last few decades. We have studied the decomposition behavior of MgH 2 and MgH 2 /graphite 1:1 mixtures in the SPS process. The standard SPS setup chosen was modified by including the temperature measurement inside the sample,…
The intermediate stage sintering kinetics of undoped ZnO and ZnO doped with 0.1–1.2 mol% Mn were investigated. It was found that the densification in the initial and intermediate stages is affected by surface diffusion in both undoped and Mn‐doped ZnO, and that this contribution increases with the increase in the Mn c…
The phase relations in the pseudo‐ternary system La 2 O 3 –SrO–Fe 2 O 3 have been investigated in air. Isothermal sections at 1100° and 1300°C are presented based on X‐ray diffraction and thermal analysis of annealed samples. Extended solid solubility was observed for the compounds Sr n +1− v La v Fe n O 3 n +1−δ ( n…
Abstract Blend films (free‐standing) containing 20% in volume of polyaniline (PANI) in 80% of natural rubber (NR) were fabricated by casting in three different ways: (1) adding PANI‐EB (emeraldine base) dissolved in N ‐methyl‐2‐pyrrolidone (NMP) to the latex (NRL), (2) adding PANI‐EB dissolved in m ‐cresol to NR disso…
Abstract The compound [Cu 2 (μ‐pzdc)(phen) 4 ](NO 3 ) 2 · 10H 2 O ( 1 ; pzdc = pyrazine‐2,5‐dicarboxylato; phen = 1,10‐phenanthroline) has been structurally and magnetically characterised. Theoretical calculations have allowed us to establish a plausible magneto‐structural correlation for pyrazine‐bridged complexes. (…
Abstract For Abstract see ChemInform Abstract in Full Text.
A new compound, IrMnSi, has been synthesized, and its crystal structure and magnetic properties have been investigated by means of neutron powder diffraction, magnetization measurements, and first-principles theory. The crystal structure is found to be of the TiNiSi type (ordered ${\mathrm{Co}}_{2}\mathrm{P}$, space g…
Current wireless systems are limited by RF technologies in their size, communication range, efficiency and cost. RF circuits are difficult to miniaturize without compromising performance. Antennas and inductors are major impediments for system miniaturization because of the lack of magnetic materials with suitable hig…
The complex [(tacn)(6)Fe(8)(micro(3)-O)(2)(micro(2)-OH)(12)]Br(8).9H(2)O (Fe(8)) was evaluated in vitro as a new kind of possible MRI contrast agent. Relaxivities were measured at 1.41 and 9.4 T for Fe(8) and commercial Gd-DTPA dissolved in PBS. There was significant difference for r(1) and r(2) values between Fe(8) a…
Abstract Silane‐crosslinkable polypropylene (PP) composites containing calcium carbonate (CaCO 3 ) as a filler have been investigated. The melt grafting of vinyl trimethoxysilane to PP with dicumyl peroxide (DCP) as a radical initiator is demonstrated. The thermal and mechanical properties of the crosslinkable product…
Abstract Position‐selective electrodeposition of various kinds of metals onto porous silicon (PS) with laser illumination is investigated. Maskless patterning of not only Ni, Fe, and Zn, less noble metals, but also Cu, a noble metal, was achieved by suppressing the immersion plating with chloride ions. The photo‐elect…
Novel sol–gel processes for the preparation of grain‐oriented thin films of pure and aluminum‐doped zinc oxide (AZO) are reported. Using various stabilizing ligands, oxide films with different degree of c ‐axis orientation could be prepared on amorphous substrates. The origin of orientation in sol–gel‐derived ZnO and…
Abstract Triethoxysilyl‐modified polychloroprene (CR) latex was synthesized by the emulsion copolymerization of 2‐(3‐triethoxysilylpropyl)‐1,3‐butadiene with chloroprene. This latex was mixed with unmodified CR latex and tetraethoxysilane to obtain CR–silica composites by sol‐gel reaction in the latex. SEM observation…