Materials Literature
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Zintl phases have recently been identified as potential thermoelectric materials typified by the discovery of a high thermoelectric figure of merit in the Yb14MnSb11 compound above 1000 K. We report on the synthesis and the thermoelectric properties measurements over a wide temperature range (300–1000 K) of other Zint…
The electronic structure of the ferroelectric Sn 2 P 2 S 6 single crystal is studied by X-ray photoelectron spectroscopy in both paraelectric and ferroelectric phases. The spectra were measured with monochromatized Al Kα radiation in the energy range 0–1400 eV. Experimental energies are compared with the results of th…
We formulate a theory of transport in graphene bilayers in the weak momentum scattering regime in such a way as to take into account contributions to the electrical conductivity to leading and next-to-leading order in the scattering potential. The response of bilayers to an electric field cannot be regarded as a sum o…
Mechanical and thermodynamic stability of the isoelectronic ternary inverse perovskites ${\text{Sc}}_{3}\text{EN}$ $(E=\text{B},\text{Al},\text{Ga},\text{In})$ has been studied from first principles. We confirm stability of recently synthesized cubic phases ${\text{Sc}}_{3}\text{AlN}$ and ${\text{Sc}}_{3}\text{InN}$,…
We simulated the metamaterial absorbers in two propagation conditions and observed the universal phenomenon of strong non-reciprocity. It is found that this non-reciprocity cannot be well interpreted using the effective medium theory, which indicates that the designing and understanding for the metamaterial absorber b…
One of the key technologies to evolve in the displays market in recent years is liquid crystal over silicon (LCOS) microdisplays. Traditional LCOS devices and applications such as rear projection televisions, have been based on intensity modulation electro-optical effects, however, recent developments have shown that…
The great tendency of Bi–Sr manganites to present charge order (CO) at very high temperatures and partial hybridization of the 6s2 lone pair with O p-orbitals makes these materials interesting as potential candidates for obtaining high dielectric constants with very small frequency dependence at room temperature. We h…
The intrinsic stress of carbon thin films deposited by filtered cathodic arc was investigated as a function of ion energy and Ar background gas pressure. The microstructure of the films was analyzed using transmission electron microscopy, electron energy loss spectroscopy, and Raman spectroscopy. The stress at given s…
The correlation between the optical properties of the Eu(3+) ions and their local structures in fluorozirconate glasses and glass-ceramics have been analyzed by means of steady-state and time-resolved site-selective laser spectroscopies. Changes in the crystal-field interaction, ranging from weak to medium strength va…
Abstract Polymer films with optical properties as indicators to thermal stress were obtained through the controlled dispersion of moderate amounts (≤0.1 wt.‐%) of the 4,4′‐bis(2‐benzoxazolyl)stilbene (BBS) dye into a new semicrystalline ethylene‐norbornene ( E ‐ co ‐ N , N content of 15.3 mol.‐%) copolymer characteriz…
Hollow Co structures with the size of 4-10 microm were fabricated by a simple solvothermal process using stearic acid as surfactant. Cobalt stearate formed at the initial stage and further self-assembled to micelles as a soft template. This precursor controlled the growth rate of Co crystal to form the primary nanorod…
Perfect and defective surface structures for (001) SrTiO3 are determined in considering a supercell with 11 atomic layers using the first-principles calculations. The amplitude of the surface rumpling for the SrO-terminated surface is much larger than that for the TiO2-terminated surface, although both SrO- and TiO2-t…
Dielectric and ferroelectric properties of complex perovskite lead zirconate titanate-lead nickel niobate ceramic system were investigated under the influence of the compressive stress. The results showed that the dielectric properties, i.e., dielectric constant (εr) and dielectric loss (tan δ), and the ferroelectric…
The observation of coupled magnetostatic-electromagnetic oscillations over 60–75 GHz in strontium hexaferrite-quartz structures is reported. Data on frequencies of the modes have been obtained as a function of the bias magnetic field and quantitatively analyzed for two cases: when ferrite or quartz is in contact with…
Glycerol and formamide are used as plasticizers to prepare dry thermoplastic starch (DTPS) in a single-screw extruder. Glycerol/formamide—water plasticized starch (TPS) is also studied as a standard. Scanning electron microscopy reveals that more residual granules exist in glycerol-plasticized dry starch than in other…
We have investigated the thermoelectric properties of Co and Rh mixed solid solutions Bi1.7Ba2(Co1−zRhz)2Oα (0≤z≤1) with hexagonal (Co,Rh)O2 layers. Partial substitution of Rh for Co in the hexagonal layers resulted in higher electric resistivity than in Bi1.7Ba2Co2Oα and Bi1.7Ba2Rh2Oα endmembers. We believe this to b…
Development of a novel formulation of anticancer drugs to improve their water-solubility and bioavailability remains a great challenge. Herein, the potential anticancer agent 2-methoxyestradiol (2-ME) was selected as a model drug and was encapsulated within polyelectrolyte (PE) multilayers by layer-by-layer deposition…
Studying native defects in semiconductors is of crucial importance for understanding the nature of defects as well as for controlling the quality of the as-grown materials. In this work, we present theoretical studies on the electronic structures, optical and vibrational properties of the dominant defects (VO, HO and…
Magnetocaloric effect associated with the first-order martensitic transition (TM) is investigated in polycrystalline Ni50−xMn35+xIn15 alloys with varying Mn content but fixing In content. It is found that when Mn content reaches x=3, a field-induced metamagnetic transition takes place. An external magnetic field can r…
Periodic, self-organized carbon nanocone structures with a spatial period of up to 170 nm (less than 1/5 laser wavelength) are induced by exposing a graphite surface to a single beam 800 nm ultrashort pulsed laser. When a linearly polarized laser beam is used, the nanocones are aligned perpendicularly to the direction…