Materials Literature
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Ferroelectric PbZr0.52Ti0.48O3 (PZT) thin films were prepared by a sol–gel method using SrTiO3 (STO) buffer layers. The effect of SrTiO3 buffer layers on the crystallization and electrical properties of PZT thin films has been investigated. X-ray diffraction shows that the STO buffer layers have a significant effect o…
LiTaO3(LT)/LiNbO3(LN) super-lattice thin films with different LT/LN ratios are fabricated on (0001) sapphire (α-Al2O3) substrates using the pulsed laser deposition method. Well-defined X-ray super-lattice reflections are observed, and the SL period are calculated from these super-lattice positions, which coincide well…
V-doped Na0.5Bi4.5Ti4O15 (Na0.5Bi4.5-x/3Ti4-xVxO15, NaBTiV-x, x = 0.00, 0.01, 0.03, and 0.05) thin films were prepared on a Pt(111)/Ti/SiO2/Si(100) substrate by a chemical solution deposition method. NaBTiV-0.01 thin film exhibited the most outstanding electrical properties among them. The value of remnant polarizatio…
(Pb1 − xBa x )TiO3 or PBT (0.025 ≤ x ≤ 0.100) ceramics were prepared via the solid state reaction method. The powders, calcined above 800°C, belonged to a pure tetragonal structure. The c/a ratio of the PBT powders decreased while the average particle size increased with the increasing of calcination temperatures. At…
The relationship between the molecular and crystalline structure and the dielectric response of hot-pressed PVDF film and the films cast from N,N-dimethylacetamide solution was studied by means of wide angle X-ray scattering, Raman and dielectric spectroscopy. We have found that the degree of crystallinity of hot-pres…
Bremsstrahlung from relativistic electrons is considered under conditions when some transverse direction of momentum transfer is statistically preferred. It is shown that in the dipole approximation all the medium anisotropy effects can be accumulated into a special modulus-bound transverse vector, $\mathbit{N}$. To e…
The die geometry has a massive effect on the plastic deformation behavior during pressing of material processed by equal channel angular pressing (ECAP) method; subsequently the properties of the processed material are strongly dependent on it. Two categories of designed and manufactured dies are used for equal channe…
Mechanochemical synthesis of KxNa1-xNbO3 powders, where x was from 0.1 to 0.9, has been investigated. A novel starting material of Nb(OH)5 with higher reactivity than Nb2O5 was prepared via wet chemical method. When x = 0.1, the pure perovskite phase was detected. With x increasing, the second phase of K2Nb8O21 was de…
Pb0.5Sr0.5TiO3 (PST50) thin films with different Cr doping amounts were prepared on LaNiO3 coated silicon substrates by a chemical solution deposition method. Their dielectric and ferroelectric properties were studied at room temperature. The dielectric constant decreased from 417 to 207 (at 1 kHz), as the Cr content…
By using multiple molecular dynamics (MD) trajectories, a quantitative description of carbon monoxide (CO) migration within crystal of L29F myoglobin mutant (L29F-Mb) was obtained. The aim was to provide a detailed model for ligand diffusion in the protein to be compared to the available L29F-Mb experimental-computati…
We perform a study of the energetics of KH2PO4 (KDP) by using a shell model (SM) which was constructed by adjusting the interaction parameters to ab initio calculations, and was fitted to reproduce phonons, polarization-inversion energies and structural properties. We calculate the energy profiles by performing global…
The effect of Li on the phase state of SrTiO3 was studied to clarify the predominant factors of induced polar state in incipient ferroelectrics. Dielectric, ultrasonic and polarization loops measurements were carried out in a temperature range of 3–350 K using ceramic samples of Li x Sr1-x TiO3-x/2 (0 ≤ x ≤ 0.05). The…
Recently, we successfully prepared medium density polyethylene (MDPE) nanocomposite with 3 wt %, 6 wt %, and 9 wt % cloisite Na+ and the thermal stability of nanocomposite was investigated using the thermogravimetric analysis (TGA). The TGA in air atmosphere showed significantly improved thermal stability of 3 wt %, 6…
Relaxor ferroelectric-based Pb(Mg1/3Nb2/3)O3–32PbTiO3 (PMN-32PT) single crystal was prepared by using the vertical Bridgman method at the optimized condition and the thermal stability with temperature under different conditions was analyzed through the differential scanning calorimetry (DSC) and the thermal gravity an…
Aging effect exists widely in ferroelectrics, and it is found to be significant only in acceptor-doped ferroelectrics. However, many commercial ferroelectrics contain both acceptor and donor dopants. Thus it is of interest to study aging phenomena in the presence of both acceptor and donor. This paper reports the agin…
The formation behavior of Intergrowth Bismuth Layer-Structured Ferroelectric (IBLSF) Bi4Ti3O12-CaBi4Ti4O15 is investigated through conventional solid-state reaction method using Bi2O3, TiO2, CaCO3 as initial powders. The mixed powders are treated from 550°C to 1000°C at 100°C intervals after being milled. The phase tr…
Substitution of K2O for Na2O content was performed in ferroelectric glass-ceramics of the Na2O-Nb2O5-Al2O3-SiO2 system and its effect on crystallization process and the associated properties were investigated. Conventional melt quenching method was employed for parent glass production. Phase identification shows that…
In this study, several developed models have been adopted to investigate deterioration induced by chloride ingress by considering uncertainty in order to estimate the initiation and rate of corrosion. Besides, the structural capacity and serviceability of RC buildings, i.e. the shear capacity, bending strength and wid…
This study investigated the effect of excess PbO on the crystal structure, microstructure, phase transition and dielectric properties of (Pb0.75Sr0.25)TiO3 (PST25) ceramics. The PST25 ceramics were synthesized by the solid-state reaction method with various excess PbO levels (0, 1, 3, 5 and 10 wt.%). The excess PbO wa…
One-dimensional photonic crystal band-edge lasing at different excitations was studied experimentally by altering the excitation angle. We considered almost every condition including in-band, out-of-band and near the band edge while keeping the density of states unchanged. Holographic rhodamin 6G-doped dichromated gel…