Materials Literature
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Cs Br : Eu 2 + has recently been investigated as a photostimulable x-ray storage phosphor with great potential for application in high-resolution image plates. In a recent paper Hackenschmied et al. [J. Appl. Phys. 93, 5109 (2003)] suggested that segregations of CsEuBr3 or Cs4EuBr6 formed within CsBr:Eu2+ during annea…
The electronic structure and optical properties of the rare earth sesquioxides (R2O3, R=La, Pr, and Nd) have been studied using the full potential linearized augmented plane wave method within local spin density approximation (LSDA) and Coulomb corrected local density approximation (LSDA+U) as implemented in the WIEN2…
The magnetocaloric effect of the FeCrMoCuGaPCB alloy series, suitable for being prepared as bulk amorphous alloys, has been studied. Optimal refrigeration cycles have a cold reservoir close to room temperature. The refrigerant capacity of these alloys is comparable to that of a Mo-containing Finemet-type alloy and is…
Porous silicon rugate filters are fabricated and investigated for their ability to sense chemical species. The durability of the filter is tested by allowing the structure to undergo many cycles of adsorption and desorption of vapor-phase ethanol molecules. The characteristic reflectivity peak of the structure exhibit…
The direct piezoelectric response d33 of [001]C-poled 0.955Pb(Zn1∕3Nb2∕3)O3–0.045PbTiO3 [PZN-4.5PT] and 0.98Pb(Zn1∕3Nb2∕3)O3–0.08PbTiO3 [PZN-8PT] has been investigated as a function of temperature upon heating above 40°C to the paraelectric phase. Using a Rayleigh-law based analysis, it is shown that both the reversib…
Optoelectronic measurements of carbon nanotube transistors have shown a wide variety of sensitivites to the incident light. Direct photocurrent processes compete with a number of extrinsic mechanisms. Here we show that visible light absorption in the silicon substrate generates a photovoltage that can electrically gat…
Indium-tin-oxide (ITO) thin films on polyethylene napthalate (PEN) with high carrier concentration (∼1021∕cm3) have been grown by electron-beam deposition without the introduction of oxygen into the chamber. The electrical properties of the ITO films (such as, carrier concentration, electrical mobility, and resistivit…
The modification of acoustic phonons in semiconductor nanostructures embedded in a host crystal is investigated including corrections due to strain within continuum elasticity theory. Effective elastic constants are calculated employing {\em ab initio} density functional theory. For a spherical InAs quantum dot embedd…
We use density-functional theory with the local-density approximation to study the structural and ferroelectric properties of SrTiO3 under misfit strains. Both the antiferrodistortive (AFD) and ferroelectric (FE) instabilities are considered by calculating all the phases predicted by Pertsev et al. [Phys. Rev. B 61, R…
Nitroxide radicals are paramagnetic contrast agents, used in magnetic resonance imaging (MRI), that also exert antioxidant effects. Participating in cellular redox reactions, they lose their ability to provide contrast as a function of time after administration. In this study, the rate of contrast loss was correlated…
We present further evidence for the coherent RDDI phase postulated in our earlier paper and clarify the reasons why the intersite tunnelling amplitude is increased by many orders of magnitude when a mesoscopic domain undergoes such a transition.
Na2C60 is believed to be an electron-hole counterpart of the Mott-Jahn--Teller insulator A4C60 salts. We present a study of infrared, ESR, NMR spectroscopy, X-ray diffraction, chemical composition and neutron scattering on this compound. Our spectroscopic results at room temperature can be reconciled in a picture of s…
Hydrogen bonding in infinite HF and HCl bent (zigzag) chains is studied using the ab initio coupled-cluster singles and doubles (CCSD) correlation method. The correlation contribution to the binding energy is decomposed in terms of nonadditive many-body interactions between the monomers in the chains, the so-called en…
There is a recent interest in nanoscale materials, in particular, nanotubes based not only on carbon. In this study, photoemission spectra of single MoS2 nanotubes deposited on a Si surface were recorded in order to explain their electronic structure. The photoelectrons were excited by a femtosecond laser oscillator r…
Ca Mn O 3 is an electron-doped compound which belongs to the perovskite family. Despite its high Seebeck coefficient S value, the figure of merit at high temperature remains low due to its large resistivity ρ(ρ300K=2Ωcm). To optimize the performance of this material in terms of thermoelectric properties, several subst…
Structural, optical, and chemical properties of the WO x −ZrO 2 nanometric system were investigated using Raman spectroscopy, high-resolution transmission electron microscopy (HRTEM), and UV−visible diffuse reflectance. From diffuse reflectance spectroscopy, the absorption profile of the species in which WO x was pres…
Nanoscale shells of ZrO 2 were deposited onto size-selected, aerosolized Si nanoparticles by chemical vapor deposition (CVD). The CVD precursor was nitronium pentanitratozirconate (ZN, [NO 2 ][Zr(NO 3 ) 5 ]), which has been used previously to deposit ZrO 2 films on silicon wafers. Silicon nanocrystals were synthesized…
Absorption, light emission, and upconversion properties of Tm2+-doped CsCaI3 and RbCaI3 single crystals are presented and compared. Both compounds show multiple emissions after excitation at 21834 cm(-1) between 10 and 300 K. Besides sharp 4f-4f transitions around 8800 cm(-1), five and three broad 4f-5d emission bands…
Abstract Metastable VO2 nanorods, designated as VO2(B) with diameters of 80–250 nm were synthesized via a PEG-assisted hydrothermal approach. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) methods. The electroch…
A series of Schiff-based rod−coil molecules possessing thermotropic liquid-crystalline (LC) character have been prepared whereas a sugar-based moiety was introduced to the chain end of the molecules so as to create chiral amphiphiles for self-assembly. The self-assembly of the chiral Schiff-based rod−coil amphiphiles…