Materials Literature
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(1 − x)Pb(Fe 1/2 Nb 1/2 )O 3 -xPbTiO 3 (PFN-xPT) ceramics with x = 0.13 sintered at 1200°C show diffuse phase transition and very high dielectric constant at lower frequencies. The high value of dielectric constant at lower frequencies is shown to be due to the barrier layer formation. The resistivity of the PFN-xPT c…
For enhancing the effectiveness of hydrogen water chemistry (HWC) in boiling water reactors (BWRs) in the aspects of lower hydrogen consumption and of a more effective reduction in electrochemical corrosion potential (ECP), the technique of inhibitive protective coating on structural materials was brought into conside…
As part of a structural genomics program, Structural Proteomics in Europe (SPINE), we are determining protein structures from the causative agent of anthrax, Bacillus anthracis, a Gram-positive spore-forming bacterium. Among initial candidates for crystallographic analysis are enzymes involved in nucleotide biosynthes…
Abstract Lanthanum nitrate has been investigated as corrosion inhibitor of X70 pipeline steel in 3.0 (wt.%) NaCl solution using electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in conjunction with scanning electron microscopy (SEM) and energy dispersive X…
The mesogenic, optical, and dielectric properties of the new mixtures of high-birefringence nematic liquid crystals based on isothiocyanatotolanes are investigated, and examples of multicomponent mixtures with low viscosity and optical anisotropy Delta n approximately 0.4 are presented. © 2005 Optical Society of Ameri…
The chiral fluorenone mesogens (R)‐1‐fluoro‐2‐(2‐octyloxy)‐7‐(4‐undecyloxybenzoyloxy)fluoren‐9‐one (2) and (R)‐2‐(2‐octyloxy)‐7‐(4‐undecyloxybenzoyloxy)‐3‐azafluoren‐9‐one (3) were synthesized using a combined ortho‐directed and remote metalation strategy, which also incorporates a Suzuki–Miyaura crosscoupling step. T…
A detailed study of the self-assembly ability of triblock coil-rod-coil copolymers containing a rigid di(styryl)-anthracene segment covalently linked to oxadiazole-based blocks and their binary blends with oxadiazole-based homopolymers is presented here. The self-organized microdomains seem to pack into a fascinating…
Atomistic simulation techniques have been used to predict the preferential segregation of Y3+ ions to the (100), (101) and (110) surfaces of tetragonal zirconia (t-ZrO2). It is found that segregation energetics vary greatly between surfaces. In particular, dopant ions segregate to the top of the (101) surface. Convers…
The temperature behavior of the spontaneous polarization of lead tetragermanate, a uniaxial ferroelectric, is studied in the range from 4.2 to 300 K. The results obtained along with the data from the literature make it possible to reconstruct a complete pattern of the behavior of P s (T) both in the vicinity of the ph…
Abstract We used the electrochemical techniques to study the effect of the addition of four salts, K + ,Cl − , K + ,Br − , K + ,I − and C 8 H 17 Ph 3 P + ,I − , on the corrosion behaviour of nickel when submitted to 1M sulphuric acid medium. After one hour of immersion time, we noted an acceleration of nickel corrosio…
Soft and hard type piezoceramic sintered samples were subjected to neutron irradiation in fluxes up to 10 18 n/cm 2 and the changes of the basic properties brought about by irradiation were investigated. The results showed that intermediate irradiation levels of up to 10 15 n/cm 2 do not change significantly the prope…
The effect of surface condition on the uniaxial and equibiaxial flexure strength of CoorsTek's CAP3 AD-995 alumina was examined. (Note that this material was found not to be the same as CoorsTek's AD-955 alumina-a comparison and discussion of the differences are provided in this report.) The following four surface con…
Abstract Within the frame of systematic morphological studies concerning the solvothermal formation of nanoscale and microscale molybdenum oxides from the interaction of a molybdenum‐based precursor such as MoO 3 ⋅2 H 2 O with ionic additives such as alkali and earth alkali halides, we studied – with the aim to elabor…
We report a technique for the assembly of bottom-up nanomechanical devices. This technique employs the dielectrophoretic manipulation of nanostructures within a multiple layer lithography process. Mechanical resonators were specifically produced by assembling and clamping tubular carbon fibers onto prefabricated pads.…
A theoretical model is proposed to describe the physical mechanisms of hardening and softening of nanocrystalline materials during superplastic deformation. According to this model, triple interface junctions are obstacles to glide motion of grain boundary dislocations, which are carriers of grain boundary glide defor…
Polymeric antioxidants can be useful in the protection of styrene-butadiene rubber (SBR) against thermal oxidative aging as an alternative to the low molecular weight ones, which migrate out of the rubber articles. Three polymeric compounds were prepared and incorporated into SBR mixes to be evaluated as antioxidants…
BaTiO3 (BT) nanoparticles were prepared by the hydrothermal technique using different starting materials and the microstructure examined by XRD, SEM, TEM and HRTEM. X-ray diffraction and electron diffraction patterns showed that the nanoparticles were the cubic BaTiO3 phase. The BT nanoparticles prepared from the star…
The electronic structure transition between the semiconducting and metallic states in boron (B)-doped diamonds was element-selectively observed by soft X-ray emission and absorption spectroscopy using synchrotron radiation. For lightly B-doped diamonds, the B 2 p -density of states (DOS) in the valence band was enhanc…
The effects of an electric field on the fingerprint pattern of the relaxor Pb(Zn 1/3 Nb 2/3 )O 3 (PZN) were investigated using atomic force microscopy (AFM). It was found that the pattern of the domain wall structure in the relaxor, called the fingerprint pattern, strongly depends on the dc field strength, and disappe…
The synthesis and properties of hydroxynitrobenzodifuroxan (5-nitro[1,2,5]oxadiazolo[3,4-e][2,1,3]ben-zoxadiazol-4-ol-3,8-dioxide) (1) and its salts (four metal and three amine salts) are described. Crystal structure analyses indicate that the hydroxynitrobenzodifuroxan materials can exist in two forms. One form is th…