Materials Literature
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We demonstrate the importance of thermal effects such as temperature-induced electronic, magnetic and vibrational excitations, as well as structural defects in the first-principles calculations of the magnetic critical temperature of complex alloys using half-Heusler ${\text{Ni}}_{1\ensuremath{-}x}{\text{Cu}}_{x}\text…
ZnO nanocrystals hold the potential for use in a wide range of applications particularly in optoelectronics. We report on the fabrication of a highly sensitive p-n junction diode structure based on a single ZnO tetrapod shaped nanocrystal. This device shows a noted response to ultraviolet light with high internal gain…
Surface x-ray diffraction experiments reveal that, in cobalt-doped ZnO films two to five monolayers thick, Wurtzite-type CoO nanocrystals are coherently embedded within a hexagonal boron-nitride- (h-BN)-type ZnO matrix, supporting the model of a phase separation. First-principles calculations confirm that, in contrast…
The vacancy-type defects in (Ga,Mn)N films grown by metal organic chemical vapor deposition were studied by positron annihilation technique. Doppler broadening spectra were measured for the films. Compared to the undoped GaN film, the positron trapping defects in the (Ga,Mn)N films have been changed to a new type defe…
The phenomenon of extraordinary transmission in the optical regime for circular hole arrays in optically thick metal films is studied as a function of hole size and depth. In the limit of small holes compared to the depth, the transmission properties follow a waveguide type behavior. By describing the transmission pro…
The martensitic transformation in freestanding Ni–Mn–Ga films obtained by epitaxial growth on NaCl (001) is analyzed. A temperature-magnetic field phase diagram reveals that the martensitic phase, exhibiting a higher magnetization compared to austenite, is favored by an external field. A shift of martensite temperatur…
Abstract Four random, differently ended (Cl, NH 2 , OH, and COO − ), polyethersulfone/polyetherethersulfone (PES/PEES) copolymers were studied to investigate the influence of chain ends on thermal and rheological behaviors. The number average molar mass ( M n ≈ 9500 g·mol −1 ) and the PES/PEES ratio (40/60) of all…
The structures of three temperature-dependent polymorphs of solvent-free decamethylferrocenium tetracyanoethenide, [FeCp*(2)][TCNE], are determined from high-resolution synchrotron powder diffraction data. [FeCp*(2)][TCNE] is the first organic-based ferromagnetic material to be synthesized and is known to have two str…
Abstract Blends of polypropylene/ethylene octene comonomer (PP/EOC) with conducting fillers viz., carbon black (CB) and multiwall carbon nanotubes (MWNT) were prepared using melt mixing technique with varying filler concentration and blend compositions. Thermo gravimetric analysis studies indicated that presence of fi…
The composition and evolution of a brushite-type calcium phosphate cement was investigated by Solid-State NMR and X-ray during the setting process. The cement is obtained by mixing beta-tricalcium phosphate [Ca(3)(PO(4))(2), beta-TCP] and monocalcium phosphate monohydrate [Ca(H(2)PO(4))(2).H(2)O, MCPM] in presence of…
Mixtures of symmetric diblock copolymers and rigid nanorods (NRs) that are preferentially wetted by one of the blocks (A) are systematically investigated via dissipative particle dynamics simulations. The morphology of such composites depends not only on the characteristics of the copolymers, but also on the physical…
Whiskers of the quasi-one-dimensional conductor NbS3, phase II, have been synthesized. The samples show two charge-density wave (CDW) states: below 360 and below 150 K. Both CDWs show sharp threshold fields and coherent transport revealed by ac-dc coupling, i.e., Shapiro steps. The thinnest samples (cross sections bel…
Sputter-deposited thin films of amorphous AlN:Ho (1 at.%) emits in the green (549 nm) region of the visible spectrum under electron excitation. The addition of Gd (1 at.%) in the film enhances the green emission linearly after thermal activation at 900°C for 40 min in a nitrogen atmosphere. The luminescence enhancemen…
Flowerlike porous B-type carbonated hydroxyapatite (CHAp) microspheres have been synthesized by a novel bubble-template route. Their pore sizes can be well regulated in a wide range from microscale to nanoscale by smartly constructing a kind of CO 2 bubble as a template and precisely adjusting the system pressure. We…
Hydrogenation conditions of passivated aluminum were examined in a pressure and temperature range of 6–10 GPa and 300–800 °C, respectively. The relationship between the hydrogenation reaction yields and holding time was analyzed by Johnson–Mehl–Avrami equation. An Avrami exponent n of 0.3 indicated that the reaction d…
Electrical properties of giant-permittivity core/shell structured Li0.05FexNi0.95−xO (LFNO) are studied as functions of frequency, temperature, and dc bias. Three electrical responses of depletion surface (DS), grain boundary (GB), and bulk grain are detected in the LFNO ceramics. The DS and GB effects can be separate…
Fabrication of transparent glass-ceramics containing ZnO nanocrystallites has been reported. The obtained material shows UV-excited photoluminescence consisting of both broad emission in the visible region and the free exciton emission at 3.28 eV. Since the observed emission depends on the precipitated state of ZnO in…
The electronic property of epitaxial graphenes with Na adsorption or intercalation is studied with the use of pseudopotential density functional method. It is found that the charge transfer and the Na binding energy show strong coverage dependence. Calculated energetics shows that Na prefers the intercalation between…
Nanoporous Ni specimens with the ligament lengths of 10–210 nm were produced by the dealloying of Ni0.25Mn0.75 alloy and annealing at 473–873 K. The coercivity (Hc) increased with increasing ligament length (L) up to 50 nm, and decreased with increasing L above 50 nm. At L<50 nm, the size dependence of Hc for n…
Elastic and inelastic neutron-scattering studies reveal details of the antiferromagnetic transition and intriguing spin dynamics in the magnetoelectric effect single crystal ${\text{LiMnPO}}_{4}$. The elastic-scattering studies confirm that the system is antiferromagnetic below ${T}_{N}=33.75\text{ }\text{K}$ with loc…