Materials Literature
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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…
Material design to achieve a f high dielectric constant of ε 33 T / ε 0 >5,000 and a large planar-mode electromechanical coupling factor (EMCF) of k p >65% near the morphotropic phase boundary (MPB) in the multicomponent system of Pb(Sc 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/3 Nb 2/3 )O 3 -(Pb,Ba,Sr)(Zr…
A microscopic theory is developed for the interplay of diffusion and chemical reaction and the results are compared with electrode impedance measurements on an oxide electrode. The theory is based on the ideas of continuous-time random walk and accounts for the interference of diffusion and recombination of the charge…
Abstract— The synthesis of carbon‐nanotube (CNT) field emitters for FEDs by thermal chemical vapor deposition (CVD) and their structural and emission characterization are described. Multi‐walled nanotubes (MWNTs) were grown on patterned metal‐base electrodes by thermal CVD, and the grown CNTs formed a network structur…
Commercial coconut shell based activated carbon (AC) was used to investigate the production of increased mesoporosity by impregnating with catalytic metal salts such as Fe(NO_3)_3 and Fe_2(SO_4)_3 followed by CO_2 gasification. The salts are found be effective in enlarging the pore size of AC and Fe(NO_3)_3 is the mor…
In the last decade, progress in diamond growth by chemical vapor deposition (CVD) has resulted in significant improvement in the quality of synthetic single crystals. This article reports on the gemological and spectroscopic features of six synthetic type IIa diamonds grown for research purposes at the French Laborato…
Mechanical and electrical properties of specimens of ZrO 2 (3Y) doped with RENbO 4 (RE =Yb, Er, Y, Dy, YNd, Sm, Nd) were investigated using micro-indentation and impedance spectroscopy in this work. The results show that ZrO 2 (3Y) doped with RENbO 4 (RE=Yb, Er, Y, Dy) possess outstanding mechanical properties, and sp…
Ultrafine‐grained copper samples produced by equal channel angular pressing were cyclically deformed at different temperatures under a constant stress amplitude of 200 MPa, and the corresponding microstructures were investigated by transmission electron microscope. The increase in temperature during cycling facilitate…
A diffusion couple of 3 mol% Y2O3–ZrO2 and titanium was isothermally annealed in argon at temperatures between 1100° and 1550°C. The phases and microstructure in the ceramic side were investigated using scanning electron microscopy and transmission electron microscopy, both attached to an energy-dispersive spectromete…