Materials Literature
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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).
The duplex stainless steels present better corrosion behavior than the conventional stainless steels. This is due to their chemical composition (Cr, Ni, Mo, N) and a balanced microstructure (50% ferrite). It might be an increase on the volumetric fraction of ferrite, depending on the cooling rate after welding. In the…
Natural rubber latex was depolymerized by a phenylhydrazine-ferrous chloride system. The influence of phenylhydrazine, ferrous chloride, and ferric chloride at initial pH values of 7 and 10 on degree of depolymerization was investigated. The conversion from ferrous ion to ferric ion and vice versa, the consumption of…
The study the present paper deals with has been developed in the framework of the Safety and Environmental Assessment of Fusion Power Long Term Programme (SEAL), continuing the past SEAFP study, promoted by the Commission of the European Union.The aim of the present work is to analyse the corrosion induced by cooling…
Magnetomechanical hysteresis process was tested using normal mode of load. Tensile and compression load with constant stress rate of 10 MPa s-1 was applied to the rod-like sample of the St3 low carbon Polish steel (cross section 40 mm2). The intensity of the mechanical Barkhausen noise (MBN) was measured during the fi…
The high cycle corrosion fatigue resistance of powder metallurgically (PM) fabricated and hot isostatically pressed (hipped) duplex stainless steels (DSSs) was investigated and compared with that of a conventional forged DSS. Tests were performed in rotating bending fatigue in a chloride and sulphate containing aqueou…
SUMMARY Delaminations in composite beams under cyclic bending are considered taking into account buckling of delaminations and damage accumulation in the interlayer. Local interlaminar tensile and shear stresses near the tips of delaminations are estimated in the framework of the theory of multilayered structures. Two…