Materials Literature
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The complex AC conductivity of the sol - gel-derived cobalt silicate gel-glasses is reported for the frequency range and temperature range 80 - 300 K. The experimental results were analysed in terms of theoretical models based on quantum tunnelling and classical hopping theories. It has been observed that classical ho…
We report ab initio calculations of the electronic structures and the band line-ups of heterocrystalline superlattices (HSLs) , and (n = 1,2,3). The band line-ups at both the (3C-BN)/(2H-BN) interface and the (3C-SiC)/(2H-SiC) interface are found to be type II, with valence-band offsets of 0.16 eV and 0.14 eV and cond…
Exchange interaction between two lanthanide or actinide ions of configuration bridged by common diamagnetic ligands is theoretically studied using a modified version of the superexchange theory developed in this paper. Exchange spin Hamiltonians were calculated for the and dimers serving as models of the and - superex…
In measurements of the dielectric dispersion carried out on single crystals of antiferroelectric lead zirconate a polar relaxation mode in the frequency range from to has been found. Using the Cole - Cole relation for the complex response the relaxation frequency and dielectric step of the mode have been determined as…
We have made a detailed study of sonoluminescence (SL) in high magnetic fields. In magnetic field sweeps at constant levels of acoustic drive, SL disappears above a pressure-dependent threshold magnetic field. Sweeps of acoustic drive at fixed magnetic fields show that the upper and lower bounds of forcing pressure th…
Local electron field emission properties of diamondlike carbon (DLC) films were measured by a probe method in 1 atmosphere ambient pressure, using the modified scanning tunneling microscopic (STM) system, and the diode method. In the STM probe method, the field emission was turn on at a low bias as +2.67 V. A large em…
Pulsed laser induced reactive quenching at a liquid–solid interface was used for the synthesis of tetrahedrally coordinated crystalline carbon nitride on a tungsten substrate. The crystalline phase was identified by transmission electron diffraction. X-ray photoelectron spectroscopy indicated that the carbon atoms are…
The dielectric dispersion in glycine phosphite crystal over the frequency range 30 - 1000 MHz is presented. Ferroelectric dispersion of the Debye type along the b-axis occurs in the microwave-frequency region and is caused by a single relaxational soft mode. The powder IR (at low temperatures between 300 and 14 K) and…
Low-field piezoelectric coefficient and strain were investigated in Ca-modified PbTiO3 thin films by means of optical interferometry. A remanent piezoelectric coefficient of 70 pm/V was observed that agrees well with the values previously reported for the bulk ceramics of the same composition. The efficient poling of…
Manganites of the series , with x = 0, 0.1, 0.3, 0.5, 0.7 and 1.0, have been characterized in ceramic form and thin films have been prepared by pulsed laser deposition. Characterization techniques included x-ray diffraction, conductivity and magnetoresistance, magnetization and susceptibility, optical spectroscopy and…
Ab initio molecular dynamics simulations are employed to investigate the dominant migration mechanism of the gallium vacancy in gaas as well as to assess its free energy of formation and the rate constant of gallium self-diffusion. our analysis suggests that the vacancy migrates by second nearest neighbour hops. the c…
The dependence of magnetization on the applied magnetic field and temperature was measured carefully near their Curie temperatures for two perovskite manganite samples: La0.67Ca0.33MnOδ and La0.60Y0.07Ca0.33MnOδ. It is suggested by the results that these materials can be utilized as both the thermal storage (passive r…
The phase diagram of globular colloids is studied using a combined analytic and computational representation of the relevant chemical potentials. It is shown how the relative positions of the phase boundaries are related to the range of interaction and the number of contacts made per particle in the solid phase. The t…
As it often happens, the key discoveries that led to our use of cholesteric liquid crystals for reflective displays happened quite by accident. Around 1990, an experiment was being conducted in a laboratory at the Liquid Crystal Institute at Kent State University that had nothing to do with displays but was designed t…
The damping behaviour of several vinyl polymers-poly(methyl methacrylate) (PMMA), poly(vinyl chloride) (PVC), polystyrene (PS) and impact polystyrene (PSi)–was studied both as a funtion of temperature and strain amplitude. The measurements were performed from room temperature up to the glass transition temperature and…
Reactions between structural and reactor materials aerosols and fission product vapours released during a severe accident in a light water reactor (LWR) will influence the magnitude of the radiological source term ultimately released to the environment. The interaction of cadmium aerosol with iodine vapour at differen…
High temperature tensile tests were carried out on L12 type Co3 Ti alloys, both undoped and doped with 1–4 at.-%Fe. There were anomalous increases of the 0·2% yield stress (yield strength) with increasing test temperature from 473 to 1073 K (or 1173 K, depending on the composition). The elongation and ultimate tensile…
The internal friction of hydrogen-doped dilute Pd100-xREx alloys (RE = Gd, Ce) (x = 1 ...9) shows three maxima in the temperature range between 10 K and 300 K. These maxima are interpreted as Zener peak of hydrogen in the β-phase (Ha = 0.11 eV), Snoek-Köster peak (Ha = 0.18 eV) and reorientation peak of diatomic H-RE…
An intergranular Ba[sbnd]Ni[sbnd]Mn oxide precipitate is identified in Ba-doped Ni manganites. The structure of this oxide, as determined by X-ray and electron diffraction, is isomorphous with monoclinic hollandite. The observed domain microstructure (accomodation twins) suggests that a high-temperature ferroelastic p…
Article Solidification of the Nd-Rich Intergranular Phase During HDDR Processing of Nd-Fe-B Type Alloys was published on December 1, 1996 in the journal International Journal of Materials Research (volume 87, issue 12).