Materials Literature
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Single-layer graphite oxide can be viewed as an unconventional type of soft material and has recently been recognized as a promising material for composite and electronics applications. It is of both scientific curiosity and technical importance to know how these atomically thin sheets assemble. There are two fundamen…
Polarization reversal process with the 90° domain wall structure at a low-frequency field was observed in the c-plate sample of Bi 4 Ti 3 O 12 using a polarizing microscope. We found that the polarization reversal process with the 90° domain wall structure consists of some basic modes: the translation, pair annihilati…
A simple mechanism for the freezing of polar nanoregions (PNRs) in relaxor ferroelectrics is presented. Using the local thermodynamic stability criterion for the polarizable medium in which the PNRs are embedded, the growth of the PNR correlation radius with decreasing temperature is derived. At the percolation thresh…
In an effort to produce an ultra-fine alpha titanium equiaxed grain structure, suitable for superplastic deformation processes, Armstrong-Process CP Ti powder, was consolidated into compacts with grain-size on the order of 2 to 3 microns. This powder has very fine dendritic-shaped particles with an inherent sub-micron…
The phenomenological theory has been applied to investigate the phase transition of the Rochelle salt crystal. The Helmholtz free energy expansion of the Rochelle salt crystal is obtained by using the basis functions of all the irreducible representations of the paraelectric phase group D 2 . An appropriate explanatio…
Z. Ž. Lazarevića, B. D. Stojanovićb, C. O. Paiva-Santosc & N. Ž. Romčevića a Institute of Physics , Zemun , Serbia b The Institute for Multidisciplinary Research , Belgrade , Serbia c Instituto de Quimica-UNESP , Araraquara , S. P. , Brasil Bi 4 Ti 3 O 12 powder was synthesized from bismuth oxide and titanium oxide. M…
In this work, electrical permittivity measurements in lead iron niobate ceramics (PFN) were performed in the frequency and temperature range from 10 kHz to 1.2 GHz and from 15 K to 450 K, respectively. The microwave dielectric results revealed unambiguously the magnetoelectric effect in the PFN and demonstrated that t…
The paper deals with the non-linear properties of the piezoelectric ceramics Pb(Zr x Ti 1 − x )O 3 (PZT) at room temperature. The influence of DC electric field on the material parameters, such as piezoelectric coefficients d 31 and d 33 of PZT ceramics, was studied using the resonance method. The dependence of the re…
The combination of redox and acid sites in lanthanide sulfonate leads to a potentially multifunctional catalyst for oxidation reactions. The title lanthanide sulfonate compound, [Yb(6)(CH(2)O(6)S(2))(4)O(OH)(8)(H(2)O)(6)](n), exhibits a novel one-dimensional columnar structure along the a direction. In the building un…
The temperature dependence of the spontaneous polarization and the dielectric constant has been analyzed for the fixed pressures of 0.001,1 and 2.2 kbar close to the phase transitions in TSCC. This analysis is performed using the experimental data for TSCC according to a power-law formula. From our analysis, using the…
Polycrystalline Pb(Zr x Ti1 − x )O 3 thin films with various thicknesses were deposited at room temperature on MgO (100) substrates by pulsed laser deposition. X-ray diffraction and atomic force microscopy were used to characterize the crystal structure and morphology and spectrophotometry measurements at wavelengths…
The formation of radiation defects in calcium and strontium fluoride single crystals doped with cadmium or zinc has been investigated by luminescence and absorption spectroscopy, as well as by electron spin resonance spectroscopy. It was found that x-irradiation could convert divalent impurity ions located at essentia…
The grain orientation effects of Bi 4 Ti0.98V 0.02 O 12 [HF-BITV-0.02] ceramics were investigated using the hot-forging (HF) method for their piezoelectric properties and the high temperature piezoelectric characteristics were examined. Piezoelectric properties of electromechanical coupling factor, k 33 , piezoelectri…
Au-nanoparticle/dendrimer composite films are stimuli-responsive materials with a potential application as highly sensitive chemiresistive sensors, since their conductance strongly changes upon sorption of chemical species from vapor phase. Here we report on the neutron reflectometry studies on such films exposed to w…
Epitaxial ferroelectric/antiferroelectric PbZr 0.8 Ti 0.2 O 3 /PbZrO 3 multilayers were grown on SrTiO 3 (100) substrates, covered with a SrRuO 3 (100) bottom electrode and a thin tetragonal PbZr 0.2 Ti 0.8 O 3 buffer layer, using pulsed laser deposition. Polarization-field, switching current-voltage and capacitance-v…
One of the most crucial steps in protein structure determination by nuclear magnetic resonance (NMR) spectroscopy is the preparation of highly concentrated and well behaving protein samples. Here we present a system of modular tags which allows for high level expression, sophisticated purification of full-length prote…
We examine manipulating the electromagnetic (EM) wave with an external static magnetic field (ESMF) taking advantage of the versatility of the magnetic photonic crystal (PC). The effect of a nonuniform ESMF on the permeability of the constituent magnetic material in the PC is demonstrated to create a gradient of the e…
We address the question of how large can the lifetime of electronic states be at low energies in graphene, below the scale of the optical phonon modes. For this purpose, we study the many-body effects at the K point of the spectrum, which induce a strong coupling between electron-hole pairs and out-of-plane phonons. W…
Abstract A new bismuth subiodide Bi 16 I 4 was synthesized by high‐temperature synthesis. Its structure was determined by single‐crystal X‐ray diffraction analysis [ C 2/ m (No. 12), a = 25.948(6) Å, b = 4.354(1) Å, c = 13.259(3) Å, β = 104.48(2)°, Z = 2, R 1 = 0.041, wR all ( F 2 ) = 0.109]. The compound belongs to t…
The aim of this paper is to clarify the fundamental difference occurring between a soft PZT ceramic and a hard one. The first type presents singly ionised and doubly ionised cation (lead) vacancies and the second one exhibits singly and doubly ionised anion (oxygen) vacancies. In this sense, this work also explains th…