Materials Literature
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Ceria nanoparticles as a support stabilize positive gold species and provide oxygen vacancies. The resulting solid exhibits an exceedingly high efficiency for the solventless aerobic oxidation of primary and secondary alcohols to carbonyl compounds (see picture).
The reflection and transmission characteristics of guided modes in parallel-plate waveguides filled with one layer or multilayer chiral medium have been investigated by using a method, which combines the multimode network theory with a rigorous mode matching procedure. The formulas of the reflection and transmission c…
Abnormal grain growth (AGG) during the sintering of Pb(Mg 1/3 Nb 2/3 )O 3 –35 mol% PbTiO 3 was investigated. When a small amount of SiO 2 was added, large abnormal grains with the penetration twin characteristic were observed to appear. AGG, in this case, is because of the twin plane re‐entrant edges that provide coar…
The MgS−Yb 2 S 3 solid solution, which can be formulated as Mg 1 - x Yb (2/3) x □ (1/3) x S (□, cation vacancy), was studied in a wide composition range (0 ≤ x ≤ 0.75). The structure and microstructure characterizations of the samples were mainly performed via transmission electron microscopy (TEM) and associated tech…
A Reply to the Comment by P. Keblinski and P. K. Schelling.Received 5 January 2005DOI:https://doi.org/10.1103/PhysRevLett.94.209702©2005 American Physical Society
Nanocrystalline x Ag–(1− x )Ba 0.5 Sr 0.5 TiO 3 (Ag–BST, 0≤ x ≤0.1, where x is the mole fraction of Ag) thin films have been deposited on Pt/Ti/SiO 2 /Si substrates by a sol–gel method. The films have been characterized by X‐ray diffraction (XRD), scanning electron microscopy, and X‐ray photoelectron spectroscopy (XPS…
An alkoxide sol–gel route to precursors to transparent enstatite fibers is described. The fibrous gels were drawn from acetic acid‐modified viscous solutions. The amount of acetic acid was found to be the crucial factor in the spinnability. Infrared studies indicated that the acetate anion behaved as a ligand and modi…
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.