Materials Literature
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Heteroepitaxial growth of Cr metal on Nb-doped SrTiO₃(001) is accompanied by Cr diffusion to interstitial sites within the first few atomic planes, an anchoring of the Cr film to the substrate, charge transfer from Cr to Ti, and metallization of the near-surface region, as depicted in the figure. The contact resistanc…
The angular spectrum (AS) method is a popular solution to the Helmholtz equation without the use of approximations. Modified band-limited AS methods are of particular interest for the cases of high-off-axis and large distance propagation problems, because conventional AS methods are impractical due to requirements reg…
Surface pyroelectricity: Centrosymmetric crystals of α-glycine display an anomalous quadrupole-like pyroelectric current. This observation implies the formation of water–glycine hybrid polar layers at the (010) faces of the α-glycine crystals (see picture).
The structures of double molybdates with general compositions ALn(MoO4)2 (A – alkaline metals, Cu or Tl) have been considered and compared. It has been shown that the ionic radii ratio RLn/RA is a key factor governing crystal symmetry. Different structure fields in ALn(MoO4)2 (A = Li+, Na+, K+, Cu+, Rb+, Ag+, Cs+, Tl+…
A fast dark-field scattering technique capturing full broadband spectra with millisecond time-resolution enables us to monitor the growth or assembly of single nano-objects in situ and in real time. Applying this technique to study the growth of single gold nanorods, together with scanning electron microscopy and fini…
We report a face-shear mode ultrasonic motor (USM) made of [011]c poled Zt ± 45° cut 0.24Pb(In1/2Nb1/2)O3-0.46Pb(Mg1/3Nb2/3)O3-0.30PbTiO3 single crystal, which takes advantage of the extremely large d36 = 2368 pC/N. This motor has a maximum no-load linear velocity of 182.5 mm/s and a maximum output force of 1.03 N und…
Graphene nanosheet (GNs)/polyaniline (PANI) nanofiber composites were prepared by oxidative polymerization of aniline in a GNs dispersed 1 mol/L HCl solution. The phase composition of the composites was analyzed by Fourier Transform Infrared Spectroscopy and X-ray Diffraction. The thermoelectric properties of the comp…
Chemical vapor deposition based graphene grown on copper foil is attractive for electronic applications owing to its reliable growth process, large area coverage, and relatively defect free nature. However, transfer of the synthesized graphene to host substrate for subsequent device fabrication is extremely sensitive…
Energy absorption in multiferroic materials stems typically from strain relaxation which can be strong even when no extrinsic defects exist in the material. Computer simulations of a simple two-dimensional model on a generic, proper ferroelastic material identify the dissipative mechanisms associated with the dynamica…
We demonstrate that Zn(Mg)O:Ga layers can be grown by molecular beam epitaxy in a two-dimensional mode with high structural perfection up to Ga mole fractions of about 6.5%. The doping efficiency is practically 100% so that free-carrier concentrations of almost 1021 cm−3 can be realized providing a zero-crossover wave…
Three isomorphic decanuclear heterometallic 3d–4f Ln 2 Cu 8 clusters, formulated as [Ln 2 Cu 8 (μ 2 -OH) 2 (μ 3 -OH) 2 (ClO 4 ) 2 (HTMHSA) 4 (H 2 O) 10 ]·15H 2 O (Ln = La ( 1, La 2 Cu 8 ); Ln = Gd ( 2, Gd 2 Cu 8 ); Ln = Dy ( 3, Dy 2 Cu 8 ), H 5 TMHSA = 3-[ N -tris(hydroxymethyl)methylamino]-2-hydroxyprop-anesulfonic a…
Asymmetrical electrical boundary conditions in (001)-oriented Pb(Zr0.2TiO0.8)O3 (PZT) epitaxial ultrathin ferroelectric films are exploited to control surface photochemical reactivity determined by the sign of the surface polarization charge. It is shown that the preferential orientation of polarization in the as-grow…
We investigate the origins of experimentally observed differences in the structure-directing capabilities of polyvinylpyrrolidone (PVP) and polyethylene oxide (PEO) for the shape-selective, colloidal synthesis of {100}-faceted Ag nanostructures. Using dispersion-corrected density-functional theory, we calculate the bi…
The low cycle fatigue behavior of Alloy 617 has been evaluated at 850 °C and 950 °C, the temperature range of particular interest for the intermediate heat exchanger on a proposed high-temperature gas-cooled nuclear reactor. Cycles to failure were measured as a function of total strain range and varying strain rate. R…
We perform ab initio calculations that indicate that the relative stability of antiphase boundaries (APBs) with armchair and zigzag chiralities in monolayer boron nitride (BN) is strongly dependent on the chemical potentials of boron (B) and nitrogen (N) in the synthesis process. For a realistic interval of chemical p…
Compounds of MnFeP1−xAsx have received attention recently for their use in active magnetic regenerators (AMR) because of their relatively high isothermal entropy change and adiabatic temperature change with magnetization. However, the materials also generally exhibit a significant magnetic and thermal hysteresis, and…
SUMMARY This work outlines a theoretical and computational framework of gradient plasticity based on a rigorous exploitation of mixed variational principles. In contrast to classical local approaches to plasticity based on locally evolving internal variables, order parameter fields are taken into account governed by a…
There is an ongoing intensive debate on the mechanism of gold nanoparticles formation regarding the intermediate precursors prior to the addition of reducing agent. A new detailed view of the widely used Brust–Schiffrin two-phase method to prepare gold nanoparticles is presented here. Precursor species of these reacti…
The amide bond is a versatile functional group and its directional hydrogen-bonding capabilities are widely applied in, for example, supramolecular chemistry. The potential of the thioamide bond, in contrast, is virtually unexplored as a structuring moiety in hydrogen-bonding-based self-assembling systems. We report h…
It is well known that the light emission at ∼1.54 μm falls within the minimum loss window of silica optic fibers for optical communication and is of significance for the silicon-based optoelectronic integration. Herein, we report on erbium (Er)-related electroluminescence (EL) at ∼1.54 μm from Er-doped ZnO (ZnO:Er)/p+…