Materials Literature
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Ten hausmannite crystals (from Ilfeld and Friedrichrode, Harz, Germany), belonging to the (Mn 1-x Zn x )Mn 2 O 4 (0 ≤ x ≤ 0.26) system (I4 1 /amd hausmannite structure type), were characterized by chemical (electron microprobe) and structural (single-crystal X-ray diffractometer) analysis. The prevailing trivalent cat…
In this work, alternative heterojunction devices to be used for gamma-radiation detection are presented. The high quality silicon/polyaniline heterostructures use polyaniline thin films as an active part of the device structure. Polyaniline thin films 40 nm thick were deposited onto silicon substrates (n-type, <100>,…
X-ray diffraction experiments are used to obtain short-range order information of gallium phosphate glasses of meta- and pyrophosphate compositions. Parameters of the first-neighbor peaks, such as coordination numbers and distances, are obtained. A strong decrease of the Ga-O coordination number from 6.0±0.2 to 4.6±0.…
The crystal structure of a lutetium silicon oxynitride (Lu 4 Si 2 O 7 N 2 ) was analyzed by the Rietveld method using time‐of‐flight (TOF) neutron powder diffraction data. The compound crystallizes in a monoclinic cell, space group P 2 1 / c (No. 14‐1) with a = 7.4243(1), b = 10.2728(1), c = 10.6628(1) Å, and β= 109.7…
Janis (Java-based nuclear information software) is a display program designed to facilitate the visualisation and manipulation of nuclear data. Its objective is to allow the user of nuclear data to access numerical and graphical representations without prior knowledge of the storage format. It offers maximum flexibili…
La burnsite, dont la formule ideale est KCdCu 7 O 2 (SeO 3 ) 2 Cl 9 , a ete decouverte dans une fumerolle dans la breche du Nord de la grande eruption fissurale du volcan Tolbachik (1975-1976), dans la peninsule de Kamchatka, en Russie. Elle se presente en grains rouge fonce, xenomorphes, equidimensionnels. Lui sont a…
Abstract Adsorption of phenols (phenol and 2-naphthol) onto the 1,1′-dimethyl-4,4′-bipyridinium (methylviologen:MV2+)-smectite intercalation compounds, which were synthesized by ion exchange reactions, led to the change in the color and the basal spacing. The color change was ascribed to the formation of charge-transf…
Abstract The adsorption of NO and its reaction with CO have been investigated on Pt/Al 2 O 3 and Rh/Al 2 O 3 by in situ infrared spectroscopy. Different spectroscopic features have been observed on Rh and Pt after NO exposure at various temperatures, mainly related to the build up of positively, neutral and negatively…
The quadratic nonlinear optical efficiency of the 2-amino-5-nitropyridinium dihydrogen chloride crystal is studied. The quadratic coefficients are determined by second-harmonic generation as d11=9 pm/V and d12=8 pm/V. The effective coefficients are obtained as deff=5.1 pm/V for type I and deff=9.7 pm/V for type II. Fo…
The optical spectra of dravite (tourmaline) with an unusually high ratio of Fe 3+ to Fe 2+ and a synthetic elbaite with high Fe 3+ content were studied at high temperature (297 to 600 K) and high pressure (to 10.51 GPa) conditions. Individual absorption bands derived from paired Fe atoms were identified in the spectra…
The thermal shock resistance of sintered Al 2 O 3 /1, 2.5, and 5 vol% SiC nanocomposites was studied using two indentation techniques. In the first technique, “indentation thermal shock” measurements were made of the extension of median/radial cracks around Vickers indentations after quenching from various temperature…
Abstract Hydrosilylation of fluorinated olefins with polyhydromethylsiloxane (PHMS) in the presence of a platinum catalyst was investigated to synthesize fluorosilicone having highly fluorinated alkyl side chains (R f ; C n F 2 n +1 ). The hydrosilylation of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10‐heptadecafluoro‐1‐dece…
Abstract Melamine fibre is a new category of advanced synthetic fiber having superior heat and flame resistance with decomposition temperature above 350°C. It suitability as a reinforcing fiber for ethylene propylene diene terpolymer, abbreviated as EPDM rubber, where ‘M’ stands for polymethylene chain, was investigat…
Using the vanishing of the typical polaron tunneling rate as an indicator of the breakdown of itinerancy, we study the localization of polaron states in a generic model for a disordered polaronic material. We find that extremely small disorder causes an Anderson localization of small polaron states. However, the ratio…
Abstract Several Al-substituted goethites were synthesized by hydrolysis of Fe 3+ salt solutions. The kinetics of the reductive dissolution of these goethites in dithionite-ethylenediaminetetra acetic acid (D-EDTA) was studied at pH 5.5, at 303, 323 and 333 K. The initial dissolution rate ( R ) per unit of surface are…
In this paper, a first-principles method is used to calculate the interaction energy between substitutional solute atoms and hydrogen in \ensuremath{\alpha}-Ti. The results show that simple metal (SM) solute atoms are repulsive to H and therefore are detraps for H, whereas transition metal (TM) solute atoms, with smal…
In 1987, in the city of Goiânia, Brazil, occurred one of the worst radiological accidents ever reported. The remains of 137Cs contamination in a terrain where part of a radiotherapy unit had been manipulated in 1987 were measured in 1999-2000, and some of the results are presented here. Using the technique of gamma ra…
The molecular and supermolecular orientation, morphology and structural changes observed during cold drawing of injection moulded isotactic polypropylene modified by specific α, and β nucleating agents were studied by polarised photoacoustic FTIR spectroscopy, wide-angle X-ray diffraction and differential scanning cal…
Despite the fact that polymer crystallization has been the object of intense research, this process is far from being fully understood. Traditional polymer crystallization studies using X-ray scattering techniques mainly provide information about the ordered regions. To obtain a more complete information about the tim…
Research on the plutonium rock-like oxide (ROX) fuels and their once-through burning in light water reactors has been performed to establish an option for utilizing and disposing effectively the excess plutonium. The ROX fuel is a sort of the inert matrix fuels and consists of mineral-like compounds such as yttria sta…