Materials Literature
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By decorating the surfaces of smooth, flat platelets with hemispheroidal asperities and calculating the overlapping excluded volume of spherical depletion agents as two platelets approach face to face, we determine the depletion interaction potential for both ordered and disordered surface asperities. Depending on the…
The effect of Al donor and O vacancy (VO) on the magnetic properties of Co-doped ZnO has been studied by first-principles calculations. It is found that only Al donor cannot induce ferromagnetism (FM) in Co-doped ZnO but can provide additional electrons, which results in the enhancement of Fermi level. The presence of…
Spatial coexistence of ferroelectric and magnetic domains in micrometer scale is confirmed by multimode scanning probe microscopy of pulsed laser deposited Bi0.7Dy0.3FeO3 thin films. The observed change in ferroelectric polarization with applied magnetic field proves the coupling between magnetic and ferroelectric ord…
A material consisting of multi-walled carbon nanotubes (MWCNTs) and larger titania (TiO(2)) nanotube arrays has been produced and found to be efficient for reversible hydrogen (H(2)) storage. The TiO(2) nanotube arrays (diameter ∼60 nm and length ∼2-3 µm) are grown on a Ti substrate, and MWCNTs a few µm in length and…
The use of second-order Jahn-Teller active Mo (VI) centers and chiral organic amines is discussed as an approach to crystallographic noncentrosymmetry. Several series of reactions, conducted under mild hydrothermal conditions, were designed to probe important reaction variables. Correlations between reagent and solven…
Thin lamellae were cut from bulk single crystal BaTiO3 using a focused ion beam microscope. They were then removed and transferred onto single crystal MgO substrates, so that their functional properties could be measured independent of the original host bulk ferroelectric. The temperature dependence of the capacitance…
Mn-doped CdS nanorods synthesized by solution phase chemistry demonstrate robust ferromagnetic properties at and above room temperature. The nanorods show large coercivity, possibly originating from the shape anisotropy. The hysteresis measurements reveal strong temperature dependence. Possible origin of the ferromagn…
In situ, high-temperature Raman spectroscopy was used to study the Q n speciation in binary Nasilicate glasses and melts. Over 300 Raman spectra in the compositional range from 25 to 40 mol% Na 2 O were collected at room and high temperatures between 800 and 1200 K. Quantitative information on the relative abundances…
The synthesis, crystal structures, second-harmonic generation (SHG), piezoelectric, pyroelectric, and ferroelectric properties of three polar noncentrosymmetric (NCS) hexagonal tungsten bronze-type oxides are reported. The materials KNbW 2O 9, RbNbW 2O 9, and KTaW 2O 9 were synthesized by standard solid-state techniqu…
Finding the missing species: Two isopolyoxotungstate clusters with unprecedented “S”-shaped [H4W22O74]12− and “§”-shaped [H10W34O116]18− geometries are presented. The development of this structural complexity comes from the structural evolution based on the {W11} fragment and establishes a new building block principle…
The effects of pressure up to $\ensuremath{\sim}20\text{ }\text{kbar}$ on the structural phase transition of ${\text{SrFe}}_{2}{\text{As}}_{2}$ and lightly Sn-doped ${\text{BaFe}}_{2}{\text{As}}_{2}$ as well as on the superconducting transition temperature and upper critical field of $({\text{Ba}}_{0.55}{\text{K}}_{0.…
We report electrical properties of Ta-doped SnO2 (Sn1−xTaxO2) films epitaxially grown on (110) surfaces of rutile TiO2 single crystalline substrates by a pulsed laser deposition method. Due to the large in-plane lattice mismatches (3.0% along [1¯10] and 7.7% along [001]), the films had almost relaxed crystalline struc…
Abstract Conducting polymer composites were prepared by hot compression molding of high‐density polyethylene (HDPE) prelocalized with graphite (Gr). The variation of room temperature electrical conductivity, dielectric constant, and Shore‐D hardness as a function of graphite content were studied below and above percol…
Measurements of the in-plane magnetic-field penetration depth ${\ensuremath{\lambda}}_{\text{ab}}$ in Fe-based superconductors with the nominal composition ${\text{SmFeAsO}}_{0.85}$ $({T}_{c}\ensuremath{\simeq}52\text{ }\text{K})$ and ${\text{NdFeAsO}}_{0.85}$ $({T}_{c}\ensuremath{\simeq}51\text{ }\text{K})$ were carr…
By reducing film thickness to a few nanometers, the narrow-band-gap CuS turns highly transparent. Surface modification by a self-assembled monolayer is the key factor to obtain a thin, dense, and continuous film. The film growth mechanism is identified as “layer-by-layer growth followed by islanding.” After annealing,…
Sr 3 ( Al 2 O 5 ) Cl 2 phosphor doped with Eu2+ was prepared by a soli-state reaction. This phosphor emits a broad orange-yellow luminescence with a peak wavelength of 620nm and a full width at half maximum of about 175nm under near-ultraviolet (NUV) excitation at ∼400nm. Yellow light-emitting diodes (LEDs) for genera…
Magnesium is light, biocompatible and has similar mechanical properties to natural bone, so it has the potential to be used as a biodegradable material for orthopedic applications. However, pure magnesium severely corrodes in a physiological environment, which may result in fracture prior to substantial tissue healing…
To see if ferromagnetism can occur in C-doped anatase TiO2, we performed first-principles calculations for a number of C-doped structures in which C atoms substitute O atoms. Our study shows that each C has spin-polarized 2p states in the band gap generating a magnetic moment of 2.0μB. The magnetic coupling between do…
The oxidation state of Fe in hydrous ultrapotassic (phono-tephritic) melts coexisting with mixed H 2 O-CO 2 fluids was studied experimentally at 1200 and 1250 °C and pressures from 50 to 500 MPa. The oxygen fugacity (f O₂ ) varied from NNO-2.9 to NNO+2.6 in log f O₂ , relative to the Ni-NiO oxygen buffer (NNO), as imp…
Abstract Miniaturized solid oxide fuel cells are fabricated on a photostructurable glass ceramic substrate (Foturan) by thin film and micromachining techniques. The anode is a sputtered platinum film and the cathode is made of a spray pyrolysis (SP)‐deposited lanthanum strontium cobalt iron oxide (LSCF), a sputtered p…