Materials Literature
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Low temperature, reversible mechanical effects in BiMnO3–PbTiO3 are shown to be analogous to those reported in multiferroic BiFeO3. The same stiffening (on cooling) has been found in ferroelectric BiScO3–PbTiO3 that shows negligible conduction. This has allowed permittivity and polarization studies, not possible in Bi…
We report the synthesis and characterization of Sb-doped Te-rich nanotubes, and study their memory switching properties under the application of electrical pulses. Te-rich nanotubes display significantly low writing currents due to their small cross-sectional areas, which is desirable for power-efficient memory operat…
Abstract In this article, we demonstrated that within a hydrophilic biopolymer–plasticizer system, the molecular “activity” of the plasticizer also influenced the extent of these interactions. We demonstrated through an analysis of crystallinity and calorimetry results that the equilibrium moisture content within the…
Metal transition and superconductivity were observed in Li-doped $\ensuremath{\alpha}$-rhombohedral boron (\ensuremath{\alpha}-B${}_{12}$). The authors have established a purification method and obtained a large amount of high-purity $\ensuremath{\alpha}$-B${}_{12}$ powder. Li doping into purified $\ensuremath{\alpha}…
With extensive first-principles density-functional-theory calculations, we investigate the stability and the atomic and electronic structures of the CrB(2)(0001) and MoB(2)(0001) surfaces, each with two different terminations. It is found that the boron-terminated surface is energetically more favorable over the wide…
Dynamic switching spectroscopy piezoresponse force microscopy is developed to separate thermodynamic and kinetic effects in local bias-induced phase transitions. The approaches for visualization and analysis of five-dimensional data are discussed. The spatial and voltage variability of relaxation behavior of the a-c d…
A method to calculate the transmission coefficient in multiterminal systems is presented. By adding a complex absorbing potential to the Hamiltonian of the semi-infinite leads, the problem of inverting an infinite dimensional matrix is transformed into a finite dimensional eigenvalue problem. Using this approach trans…
We report on the lattice location of Mn in heavily p-type doped GaAs by means of β− emission channeling from the decay of M56n. The majority of the Mn atoms substitute for Ga and up to 31% occupy the tetrahedral interstitial site with As nearest neighbors. Contrary to the general belief, we find that interstitial Mn i…
A simple soft-core model potential is proposed to discuss the self-diffusion of biomolecules in solution. Extensive Brownian-dynamics simulations are performed to obtain the long-time self-diffusion coefficient. Then the simulation results are compared with the experimental data from a unified point of view recently o…
The instability of silver nanoblocks under atmospheric conditions is investigated. The localized surface plasmon resonance band of the silver nanoblocks shows a red shift, broadening, and damping with increasing storage time under atmospheric conditions. The change in spectral properties of silver nanoblocks is consid…
The structural and magnetic properties of Mn2FeSbO6 single-crystalline mineral and ceramic samples synthesized under thermobaric treatment have been investigated, and compared to theoretical predictions based on first-principles electronic structure calculations. This ilmenite system displays a sharp magnetic transiti…
In this paper, Ag-Au alloy nanoparticles (NPs) were fabricated by dewetting process to enhance the broadband antireflection performance of textured silicon surfaces. The alloy NPs presented a large range of shapes and sizes, which provided an average reflectance (AR) below 4% over the spectral range of 300~1200 nm, a…
Abstract Scheelite type red phosphors CaLa 1– x NbWO 8 : x Eu 3+ ( x = 0.01, 0.03, 0.05, 0.1, 0.15, 0.2, and 0.25) and CaLa 0.8– y NbWO 8 : 0.2Eu 3+ , y Bi 3+ ( y = 0.1, 0.15, and 0.2) were prepared by conventional solid state reaction route. The crystalline structure, morphology and absorbance of these phosphors were…
The electronic properties of graphenes depend sensitively on their deformation, and therefore strain engineered graphene electronics is envisioned. In order to deform graphenes locally, we have mechanically exfoliated single and few layer graphenes onto atomically flat mica surfaces covered with isolated double strand…
We report a dramatic change in effective three-photon absorption coefficient of amorphous Ge16As29Se55 thin films, when its optical band gap decreases by 10 meV with 532 nm light illumination. This large change provides valuable information on the higher excited states, which are otherwise inaccessible via normal opti…
Abstract Detailed characterisation of natural sepiolite from the Eskisehir region of Turkey was performed using X‐ray diffraction, X‐ray fluorescence, field emission scanning electron microscopy, specific surface area (BET method), Fourier transform infrared spectra, derivative thermogravimetry (DTG) and differential…
Synthetic metal oxide nanomaterials exert toxicity via two general mechanisms: release of free ions at concentrations which exert toxic effects upon the target cell, or specific surface-mediated physicochemical processes leading to the formation of hydroxyl free radicals and other reactive oxygen species which act to…
The particle size effects on the charge and spin correlations in half-doped manganite Nd 0.5 Ca 0.5 MnO 3, which exhibits a charge-ordered (CO) transition at 250 K in the bulk counterpart, have been investigated by magnetometry and electron spin resonance (ESR). Magnetic measurements show that reducing the particle si…
This study examined the various physical, structural and electrical properties of SiO(2) doped Ge(2)Sb(2)Te(5) (SGST) films for phase change random access memory applications. Interestingly, SGST had a layered structure (LS) resulting from the inhomogeneous distribution of SiO(2) after annealing. The physical paramete…
In this study, ZnO nanowires (ZNWs)-based optoelectric devices are found to exhibit strong persistent photoconductivity (PPC) effect. An optical modulation on the PPC effect of the ZNWs with 980 nm infrared (IR) laser has been investigated. It was found that the decay time for the PPC can be significantly shortened by…