Materials Literature
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The ( H , T )-phase diagram of the multiferroic perovskite TbMnO 3 was studied by high-resolution thermal expansion α( T ) and magnetostriction Δ L ( H )/ L measurements. Below T N ≃ 42 K, TbMnO 3 shows antiferromagnetic order, which changes at T FE ≃ 28 K where simultaneously a spontaneous polarization P ∥ c develops…
The remarkable mechanical, electrical and thermal properties of single-walled carbon nanotubes (SWCNTs) have attracted extensive research interest as structural and functional materials. In particular, SWCNTs have been used to reinforce polymers and ceramic composites and great progress has been made. For metal matrix…
CdSe nanocrystals with a zinc blende structure allowed apparent Mg doping (∼9.8 at.%). Inverse micelles were formed at a low temperature as templates for the zinc blende CdSe nanocrystals, and paraffin oil and oleic acid were used as a solvent and a surfactant, respectively. The Mg doping was shown by energy dispersiv…
Electric-field-induced lattice strains in a tetragonal ferroelectric lead zirconate titanate bulk ceramic are characterized under application of subcoercive cyclic electric fields using neutron diffraction and a stroboscopic data collection technique. At a driving electric field equal to half of the coercive field, th…
The interactions between edge dislocations and grain boundaries---dislocation pileup, dislocation absorption, and dislocation transmission---are studied by performing quasicontinuum simulations. The $⟨112⟩$ asymmetrical tilt grain boundaries with different misorientation angles are used. The atomic configurations and…
A self-organized tantalum oxide nanopyramidal structure without tedious semiconductor processing is proposed in this letter. Construction of pyramid arrays with a close-packed periodicity of 200nm and a height of 200nm was achieved by the anodic alumina template method directly on the substrate. The tantalum oxide nan…
An atomistic study is conducted on the effect of H, which is homogeneously distributed in a stacking fault, on the activation energy of the cross slip of a screw dislocation in Ni using the embedded-atom method. The global minimum energy configurations with H in the stacking fault and the cross-slip processes are dete…
The magnetic phase diagram of single crystalline ${\mathrm{Ho}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ below ${T}_{N}$ is determined by measuring the magnetic susceptibility $(\ensuremath{\chi})$, specific heat $({C}_{p})$, dielectric constant $(\ensuremath{\epsilon})$, and thermal conductivity…
The authors report extremely low electron field emission thresholds from acid oxidized multiwall carbon nanotubes deposited on paper substrates by dip coating in an aqueous nanotube ink. Using paper substrates of differing surface roughness, field emission threshold fields ranging from 0.8to11.6V∕μm were observed, var…
Automated peak identification in electron beam excited X-ray microanalysis with energy dispersive X-ray spectrometry (EDS) is subject to occasional mistakes even on well-separated, high-intensity peaks arising from major constituents. The problem is exacerbated when analysis conditions are restricted to operation in t…
CdSe colloidal nanocrystals (∼3.7nm) with zinc blende structure were synthesized at a low temperature via an inverse micelle technique. They were successfully doped with ∼4at.% Mn, which was examined using inductively coupled plasma atomic emission spectroscopy. In spite of larger particle size (∼4.1nm), the Mn-doped…
The formation of Ti2AlN by solid state reaction between layers of wurtzite-AlN and α-Ti was characterized by in situ x-ray scattering. The sequential deposition of these layers by dual magnetron sputtering onto Al2O3(0001) at 200°C yielded smooth, heteroepitaxial (0001) oriented films, with abrupt AlN∕Ti interfaces as…
There are several issues that need to be better understood before breast tissue-engineering becomes viable clinically. One of the key issues is the interaction between cells and the microtopography of the implant surface. The aim of this study was to evaluate the efficacy of D1 cells, multipotent mouse bone marrow str…
Phase transformation from β-BiNbO4 to α-BiNbO4 in BiNbO4 bulk samples was studied. From x-ray diffraction patterns, the transformation from β to α phase of BiNbO4 could be observed by heating the bulk samples of β-BiNbO4 from low temperatures to 700–1030°C. Such a transformation did not occur in powder samples and in…
Abstract Fundamental principles of polymer physics were used for description of relaxation behavior of polymer chain near solid surface. In a nanocomposite, considerable portion of polymer matrix is in contact with the filler surface even at very low filler loadings. In this study, nanocomposite was considered as a tw…
There are six known phases for phosphorus at room temperature under high pressure. Only the structure of phase IV, which exists from 107 GPa to 137 GPa, remains unsolved. We performed a powder x-ray diffraction experiment and a Rietveld analysis and successfully determined its structure to be an incommensurately modul…
A special mechanism of strain hardening in deformed nanocrystalline materials (NCMs) is suggested and theoretically described. The mechanism represents generation of disclination dipoles at grain boundaries (GBs) due to GB sliding. It is shown that special strain hardening can effectively suppress plastic flow instabi…
Tungsten oxide W18O49 nanowires with diameters of 10–20nm were synthesized with high yield by thermal evaporation in a tube furnace. By heating tungsten trioxide powder at 900°C in vacuum (5×10−3torr), W18O49 nanowires with diameters of 10–20nm and lengths up to micrometers were produced with high yield on the Au-coat…
The authors report electrical transport properties of p-n junction based on semiconducting single-walled carbon nanotubes (SWCNTs). The formation of p-n junction is realized in SWCNTs, which are encapsulated with Fe nanoparticles at low filling fractions. The devices exhibit an excellent rectifying behavior, and no cu…
A two-step method was proposed in synthesizing V2O5 nanorods on planar substrates, i.e., depositing a V2O3 thin film at approximately 220 degrees C (by heating a pure sheet of vanadium in a rough vacuum) and then heating it in air at approximately 400 degrees C. The V2O5 nanorods produced by this technique are single…