Materials Literature
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The main interest in the area of practical applications of ferroelectrics, particularly at the microwave frequency, is oriented now to room temperature. In this connection, ferroelectrics like BaxSr1−xTiO3 should be carefully studied. Such materials are characterized by the second order phase transition. In a perfect…
Uniform hollow polymer microspheres were prepared by coating silica microsphere templates with poly(benzyl methacrylate) using surface-initiated controlled/living radical polymerization and subsequently removing the core by chemical etching. Shell thickness was controlled by varying the polymerization time. Scanning e…
What factors determine whether or not a particular liquid will wet a particular surface? Is it possible for a meniscus in a capillary to become convex from concave? What would you have to do to flatten it out? In university courses in physics there is often a lack of example or comment concerning the influence of temp…
We investigate a toy model of liquid, based on simplified hypernetted chain equations in very large spatial dimension D. The model does not exhibit a phase transition, but several regimes of behavior when D-->infinity can be observed in different intervals of the density.
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We investigate the structure of defects in nematic liquid crystals confined in spherical droplets and subject to radial strong anchoring. Equilibrium configurations of the order-parameter tensor field in a Landau-de Gennes free energy are numerically modeled using a finite-element package. Within the class of axially…
The spectrally selective optical properties of wavelength selective radiation emitters and filters based on periodically microstructured metal surfaces were investigated. Metal surfaces were structured by the use of a holographic mask and subsequent etching processes. Due to the microstructure, thermally excited surfa…
The charge ordering process in a mixed valence system ${\mathrm{LuFe}}_{2}{\mathrm{O}}_{4}$ is investigated both experimentally and theoretically. The experimental results using various types of diffraction techniques reveal the following unique features. (i) The system undergoes sequential transitions: $\mathrm{disor…
The nucleation of hydroxyapatite (HAp) crystal through chemical interaction with collagen was investigated. A collagen membrane was soaked in a supersaturated simulated body fluid (1.5 SBF) solution with ion concentrations at 1.5 times that of normal simulated body fluid (1.0 SBF). A few carbonate‐containing HAp cryst…
The tetranuclear [Ni4(pypentO)(pym)(mu 3-OH)2(mu-Oac)2(NCS)2(OH2)] cubane-like complex has been prepared, and its structure and magnetic properties have been studied (pypentO and pym are the deprotonated forms of 1,5-bis[(2-pyridylmethyl)amino]pentane-3-ol and 2-pyridylmethanol, respectively). The X-ray diffraction an…
In this paper, a new tool is proposed to carry out acoustic cavitation monitoring and to have an overview of its effects in applications. After a brief review of the cavitation characterization techniques, it is shown that cavitation noise is a suitable and accurate indicator of the cavitation activity induced in a li…
We establish a phase diagram for the electron-doped manganites ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sm}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.15).$ The low-temperature insulating phase of $x=0.15$ is a mixed antiferromagnet with two long-range antiferromagnets, C-type (monoclinic) and G-type (orthorhombic), coe…
We have successfully calculated the electronic and structural properties of chromia $({\mathrm{Cr}}_{2}{\mathrm{O}}_{3})$ in the local spin density approximation. We predict a transformation from the corundum to the ${\mathrm{Rh}}_{2}{\mathrm{O}}_{3}$ (II) structure around 15 GPa in the antiferromagnetic (AFM) phase a…
Optical conductivity spectra of a cleaved ab plane of ${\mathrm{La}}_{1.2}{\mathrm{Sr}}_{1.8}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ exhibit a small polaron absorption band in the midinfrared region over all temperatures. With decreasing temperature $(T)$ up to Curie temperature ${(T}_{C}),$ the small polaron band moves to…
Direct experimental estimations of the low-energy (1.5--10 meV) complex dielectric constants spectrum and its temperature variation have been investigated for ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ thin films using terahertz time-domain spectroscopy. At low temperatures, a clear Drude term emerges.…
Study of the (001) surface of the ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ system in various magnetic orderings points to a general occurrence: ${z}^{2}$ dangling bond charge---which is ``invisible'' in the formal valence picture---is promoted to the bulk gap and/or Fermi level region. Thi…
Abstract A composite of polyaniline (PANI) encapsulating titanium oxide (TiO2) with nanometer size has been synthesized by in-situ emulsion polymerization. Particle dimensions have been measured and the nature of the association between the components have been observed using SEM and TEM techniques. The interaction be…
The densification behavior and mechanical properties of B 4 C hot‐pressed at 2000°C for 1 h with additions of Al 2 O 3 up to 10 vol% were investigated. Sinterability was greatly improved by the addition of a small amount of Al 2 O 3 . The improvement was attributed to the enhanced mobility of elements through the Al 2…
The chemical compatibility of silver electrodes and low‐firing ceramics has been considered, in terms of the existence of a tie line between silver (and/or Ag 2 O) and the binary oxide compound in the corresponding ternary phase diagram. The probability of the existence of the tie line is related to the conditions in…
Porous silicon microcavity resonators possess the unique characteristics of line narrowing and luminescence enhancement. The emission peak position is completely tunable by changing the properties of the central layer. Increasing the thickness of the central active layer introduces multiple narrow peaks in the lumines…